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https://github.com/Alfresco/alfresco-community-repo.git
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dda6d72701
Got rid of some unneeded imports in AVMSyncServiceImpl. Fixed build error in UIUserSandboxes. git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/WCM-DEV2/root@3848 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
678 lines
26 KiB
Java
678 lines
26 KiB
Java
/*
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* Copyright (C) 2006 Alfresco, Inc.
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*
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* Licensed under the Mozilla Public License version 1.1
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* with a permitted attribution clause. You may obtain a
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* copy of the License at
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*
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* http://www.alfresco.org/legal/license.txt
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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* either express or implied. See the License for the specific
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* language governing permissions and limitations under the
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* License.
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*/
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package org.alfresco.repo.avm;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import org.alfresco.service.cmr.avm.AVMBadArgumentException;
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import org.alfresco.service.cmr.avm.AVMNodeDescriptor;
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import org.alfresco.service.cmr.avm.AVMNotFoundException;
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import org.alfresco.service.cmr.avm.AVMService;
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import org.alfresco.service.cmr.avm.AVMWrongTypeException;
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import org.alfresco.service.cmr.avmsync.AVMDifference;
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import org.alfresco.service.cmr.avmsync.AVMSyncException;
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import org.alfresco.service.cmr.avmsync.AVMSyncService;
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import org.apache.log4j.Logger;
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/**
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* This implements APIs that allow comparison and synchronization
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* of node trees as well as cumulative operations on layers to
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* support various content production models.
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* @author britt
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*/
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public class AVMSyncServiceImpl implements AVMSyncService
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{
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private static Logger fgLogger = Logger.getLogger(AVMSyncServiceImpl.class);
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/**
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* The AVMService.
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*/
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private AVMService fAVMService;
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/**
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* The AVMRepository.
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*/
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private AVMRepository fAVMRepository;
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/**
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* Do nothing constructor.
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*/
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public AVMSyncServiceImpl()
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{
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}
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/**
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* Set the AVM Service. For Spring.
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* @param avmService The AVMService reference.
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*/
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public void setAvmService(AVMService avmService)
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{
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fAVMService = avmService;
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}
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public void setAvmRepository(AVMRepository avmRepository)
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{
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fAVMRepository = avmRepository;
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}
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/**
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* Get a difference list between two corresponding node trees.
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* @param srcVersion The version id for the source tree.
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* @param srcPath The avm path to the source tree.
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* @param dstVersion The version id for the destination tree.
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* @param dstPath The avm path to the destination tree.
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* @return A List of AVMDifference structs which can be used for
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* the update operation.
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*/
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public List<AVMDifference> compare(int srcVersion, String srcPath,
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int dstVersion, String dstPath)
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{
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if (srcPath == null || dstPath == null)
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{
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throw new AVMBadArgumentException("Illegal null path.");
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}
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List<AVMDifference> result = new ArrayList<AVMDifference>();
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AVMNodeDescriptor srcDesc = fAVMService.lookup(srcVersion, srcPath, true);
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if (srcDesc == null)
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{
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throw new AVMSyncException("Source not found: " + srcPath);
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}
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AVMNodeDescriptor dstDesc = fAVMService.lookup(dstVersion, dstPath, true);
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if (dstDesc == null)
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{
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// Special case: no pre-existing version in the destination.
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result.add(new AVMDifference(srcVersion, srcPath,
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dstVersion, dstPath,
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AVMDifference.NEWER));
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}
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else
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{
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// Invoke the recursive implementation.
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compare(srcVersion, srcDesc, dstVersion, dstDesc, result);
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}
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return result;
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}
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/**
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* Internal recursive implementation of compare.
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* @param srcVersion The version of the source tree.
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* @param srcDesc The current source descriptor.
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* @param dstVersion The version of the destination tree.
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* @param dstDesc The current dstDesc
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*/
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private void compare(int srcVersion, AVMNodeDescriptor srcDesc,
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int dstVersion, AVMNodeDescriptor dstDesc,
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List<AVMDifference> result)
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{
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// Determine how the source and destination nodes differ.
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int diffCode = compareOne(srcDesc, dstDesc);
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switch (diffCode)
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{
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case AVMDifference.SAME :
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{
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// A big short circuit.
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return;
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}
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// The trivial to handle cases.
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case AVMDifference.NEWER :
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case AVMDifference.OLDER :
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case AVMDifference.CONFLICT :
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{
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result.add(new AVMDifference(srcVersion, srcDesc.getPath(),
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dstVersion, dstDesc.getPath(),
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diffCode));
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return;
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}
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case AVMDifference.DIRECTORY :
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{
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// First special case: source is a layered directory which points to
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// the destinations path, and we are comparing 'head' versions.
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if (srcDesc.isLayeredDirectory() &&
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srcDesc.getIndirection().equals(dstDesc.getPath()) && srcVersion < 0 && dstVersion < 0)
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{
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// Get only a direct listing, since that's all that can be different.
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Map<String, AVMNodeDescriptor> srcList =
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fAVMService.getDirectoryListingDirect(srcDesc, true);
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// The biggest shortcut: if the source directory is directly empty
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// then we're done.
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if (srcList.size() == 0)
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{
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return;
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}
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// We grab a complete listing of the destination.
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Map<String, AVMNodeDescriptor> dstList =
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fAVMService.getDirectoryListing(dstDesc, true);
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for (String name : srcList.keySet())
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{
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AVMNodeDescriptor srcChild = srcList.get(name);
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AVMNodeDescriptor dstChild = dstList.get(name);
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if (dstChild == null)
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{
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// A missing destination child means the source is NEWER.
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result.add(new AVMDifference(srcVersion, srcChild.getPath(),
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dstVersion,
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AVMNodeConverter.ExtendAVMPath(dstDesc.getPath(), name),
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AVMDifference.NEWER));
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continue;
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}
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// Otherwise recursively invoke.
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compare(srcVersion, srcChild,
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dstVersion, dstChild,
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result);
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}
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return;
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}
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// Second special case. Just as above but reversed.
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if (dstDesc.isLayeredDirectory() &&
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dstDesc.getIndirection().equals(srcDesc.getPath()) && srcVersion < 0 && dstVersion < 0)
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{
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// Get direct content of destination.
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Map<String, AVMNodeDescriptor> dstList =
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fAVMService.getDirectoryListingDirect(dstDesc, true);
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// Big short circuit.
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if (dstList.size() == 0)
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{
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return;
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}
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// Get the source listing.
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Map<String, AVMNodeDescriptor> srcList =
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fAVMService.getDirectoryListing(srcDesc, true);
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for (String name : dstList.keySet())
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{
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AVMNodeDescriptor dstChild = dstList.get(name);
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AVMNodeDescriptor srcChild = srcList.get(name);
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if (srcChild == null)
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{
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// Missing means the source is older.
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result.add(new AVMDifference(srcVersion,
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AVMNodeConverter.ExtendAVMPath(srcDesc.getPath(), name),
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dstVersion, dstChild.getPath(),
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AVMDifference.OLDER));
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continue;
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}
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// Otherwise, recursively invoke.
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compare(srcVersion, srcChild,
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dstVersion, dstChild,
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result);
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}
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return;
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}
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// Neither of the special cases apply, so brute force is the only answer.
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Map<String, AVMNodeDescriptor> srcList =
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fAVMService.getDirectoryListing(srcDesc, true);
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Map<String, AVMNodeDescriptor> dstList =
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fAVMService.getDirectoryListing(dstDesc, true);
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// Iterate over the source.
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for (String name : srcList.keySet())
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{
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AVMNodeDescriptor srcChild = srcList.get(name);
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AVMNodeDescriptor dstChild = dstList.get(name);
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if (dstChild == null)
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{
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// Not found in the destination means NEWER.
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result.add(new AVMDifference(srcVersion, srcChild.getPath(),
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dstVersion,
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AVMNodeConverter.ExtendAVMPath(dstDesc.getPath(), name),
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AVMDifference.NEWER));
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continue;
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}
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// Otherwise recursive invocation.
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compare(srcVersion, srcChild,
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dstVersion, dstChild,
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result);
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}
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// Iterate over the destination.
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for (String name : dstList.keySet())
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{
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if (srcList.containsKey(name))
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{
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continue;
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}
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AVMNodeDescriptor dstChild = dstList.get(name);
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// An entry not found in the source is OLDER.
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result.add(new AVMDifference(srcVersion,
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AVMNodeConverter.ExtendAVMPath(srcDesc.getPath(), name),
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dstVersion, dstChild.getPath(),
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AVMDifference.OLDER));
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}
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break;
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}
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default :
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{
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throw new AVMSyncException("Invalid Difference Code, Internal Error.");
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}
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}
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}
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/**
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* Updates the destination nodes in the AVMDifferences
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* with the source nodes. Normally any conflicts or cases in
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* which the source of an AVMDifference is older than the destination
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* will cause the transaction to roll back.
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* @param diffList A List of AVMDifference structs.
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* @param ignoreConflicts If this is true the update will skip those
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* AVMDifferences which are in conflict with
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* the destination.
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* @param ignoreOlder If this is true the update will skip those
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* AVMDifferences which have the source older than the destination.
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* @param overrideConflicts If this is true the update will override conflicting
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* AVMDifferences and replace the destination with the conflicting source.
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* @param overrideOlder If this is true the update will override AVMDifferences
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* in which the source is older than the destination and overwrite the destination.
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*/
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public void update(List<AVMDifference> diffList, boolean ignoreConflicts, boolean ignoreOlder,
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boolean overrideConflicts, boolean overrideOlder)
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{
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Map<String, Integer> storeVersions = new HashMap<String, Integer>();
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for (AVMDifference diff : diffList)
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{
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if (!diff.isValid())
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{
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throw new AVMSyncException("Malformed AVMDifference.");
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}
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// Snapshot the source if needed.
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int version = diff.getSourceVersion();
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if (version < 0)
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{
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int colonOff = diff.getSourcePath().indexOf(':');
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if (colonOff == -1)
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{
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throw new AVMBadArgumentException("Invalid path.");
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}
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String storeName = diff.getSourcePath().substring(0, colonOff);
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if (storeVersions.containsKey(storeName))
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{
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// We've already snapshotted this store.
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version = storeVersions.get(storeName);
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}
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else
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{
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version = fAVMService.createSnapshot(storeName);
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}
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}
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AVMNodeDescriptor srcDesc = fAVMService.lookup(version,
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diff.getSourcePath(), true);
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if (srcDesc == null)
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{
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throw new AVMSyncException("Source node not found: " + diff.getSourcePath());
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}
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String [] dstParts = AVMNodeConverter.SplitBase(diff.getDestinationPath());
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if (dstParts[0] == null || diff.getDestinationVersion() >= 0)
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{
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// You can't have a root node as a destination.
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throw new AVMSyncException("Invalid destination node: " + diff.getDestinationPath());
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}
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AVMNodeDescriptor dstDesc = fAVMService.lookup(-1, diff.getDestinationPath(), true);
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// The default is that the source is newer in the case where
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// the destination doesn't exist.
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int diffCode = AVMDifference.NEWER;
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if (dstDesc != null)
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{
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diffCode = compareOne(srcDesc, dstDesc);
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}
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// Dispatch.
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switch (diffCode)
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{
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case AVMDifference.SAME :
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{
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// Nada to do.
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continue;
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}
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case AVMDifference.NEWER :
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{
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// You can't delete what isn't there.
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linkIn(dstParts[0], dstParts[1], srcDesc, dstDesc != null);
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continue;
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}
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case AVMDifference.OLDER :
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{
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// You can force it.
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if (overrideOlder)
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{
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linkIn(dstParts[0], dstParts[1], srcDesc, true);
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continue;
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}
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// You can ignore it.
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if (ignoreOlder)
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{
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continue;
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}
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// Or it's an error.
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throw new AVMSyncException("Older version prevents update.");
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}
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case AVMDifference.CONFLICT :
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{
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// You can force it.
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if (overrideConflicts)
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{
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linkIn(dstParts[0], dstParts[1], srcDesc, true);
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continue;
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}
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// You can ignore it.
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if (ignoreConflicts)
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{
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continue;
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}
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// Or it's an error.
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throw new AVMSyncException("Conflict prevents update.");
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}
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case AVMDifference.DIRECTORY :
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{
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// You can only ignore this.
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if (ignoreConflicts)
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{
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continue;
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}
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// Otherwise it's an error.
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throw new AVMSyncException("Directory conflict prevents update.");
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}
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default :
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{
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throw new AVMSyncException("Invalid Differenc Code: Internal Error.");
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}
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}
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}
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}
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/**
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* Do the actual work of connecting nodes to the destination tree.
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* @param parentPath The parent path the node will go in.
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* @param name The name it will have.
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* @param toLink The node descriptor.
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* @param removeFirst Whether to do a removeNode before linking in.
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*/
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private void linkIn(String parentPath, String name, AVMNodeDescriptor toLink, boolean removeFirst)
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{
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if (removeFirst)
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{
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fAVMService.removeNode(parentPath, name);
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}
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if (toLink.isLayeredDirectory() && !toLink.isPrimary())
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{
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recursiveCopy(parentPath, name, toLink);
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return;
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}
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fAVMService.link(parentPath, name, toLink);
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}
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/**
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* Recursively copy a node into the given position.
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* @param parentPath The place to put it.
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* @param name The name to give it.
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* @param toCopy The it to put.
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*/
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private void recursiveCopy(String parentPath, String name, AVMNodeDescriptor toCopy)
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{
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fAVMService.createDirectory(parentPath, name);
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String newParentPath = AVMNodeConverter.ExtendAVMPath(parentPath, name);
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AVMNodeDescriptor parentDesc = fAVMService.lookup(-1, newParentPath, true);
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Map<String, AVMNodeDescriptor> children =
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fAVMService.getDirectoryListing(toCopy, true);
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for (Map.Entry<String, AVMNodeDescriptor> entry : children.entrySet())
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{
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recursiveCopy(parentDesc, entry.getKey(), entry.getValue());
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}
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}
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/**
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* Shortcutting helper that uses an AVMNodeDescriptor parent.
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* @param parent The parent we are linking into.
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* @param name The name to link in.
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* @param toCopy The node to link in.
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*/
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private void recursiveCopy(AVMNodeDescriptor parent, String name, AVMNodeDescriptor toCopy)
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{
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// If it's a file or deleted simply link it in.
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if (toCopy.isFile() || toCopy.isDeleted() || toCopy.isPlainDirectory())
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{
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fAVMRepository.link(parent, name, toCopy);
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return;
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}
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// Otherwise make a directory in the target parent, and recursiveCopy all the source
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// children into it.
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AVMNodeDescriptor newParentDesc = fAVMRepository.createDirectory(parent, name);
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fgLogger.error(newParentDesc);
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Map<String, AVMNodeDescriptor> children =
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fAVMService.getDirectoryListing(toCopy, true);
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for (Map.Entry<String, AVMNodeDescriptor> entry : children.entrySet())
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{
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fgLogger.error(entry.getKey());
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recursiveCopy(newParentDesc, entry.getKey(), entry.getValue());
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}
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}
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/**
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* The workhorse of comparison and updating. Determine the versioning relationship
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* of two nodes.
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* @param srcDesc Descriptor for the source node.
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* @param dstDesc Descriptor for the destination node.
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* @return One of SAME, OLDER, NEWER, CONFLICT, DIRECTORY
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*/
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private int compareOne(AVMNodeDescriptor srcDesc, AVMNodeDescriptor dstDesc)
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{
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if (srcDesc.getId() == dstDesc.getId())
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{
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return AVMDifference.SAME;
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}
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// Matched directories that are not identical are nominally in conflict
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// but get their own special difference code for comparison logic. The DIRECTORY
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// difference code never gets returned to callers of compare.
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if (srcDesc.isDirectory() && dstDesc.isDirectory())
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{
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return AVMDifference.DIRECTORY;
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}
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// Check for mismatched fundamental types.
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if ((srcDesc.isDirectory() && dstDesc.isFile()) ||
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(srcDesc.isFile() && dstDesc.isDirectory()))
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{
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return AVMDifference.CONFLICT;
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}
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// A deleted node on either side means uniform handling because
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// a deleted node can be the descendent of any other type of node.
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if (srcDesc.isDeleted() || dstDesc.isDeleted())
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{
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AVMNodeDescriptor common = fAVMService.getCommonAncestor(srcDesc, dstDesc);
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if (common == null)
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{
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return AVMDifference.CONFLICT;
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}
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if (common.getId() == srcDesc.getId())
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{
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return AVMDifference.OLDER;
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}
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if (common.getId() == dstDesc.getId())
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{
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return AVMDifference.NEWER;
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}
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// Must be a conflict.
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return AVMDifference.CONFLICT;
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}
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// At this point both source and destination are both some kind of file.
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if (srcDesc.isLayeredFile())
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{
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// Handle the layered file source case.
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if (dstDesc.isPlainFile())
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{
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// We consider a layered source file that points at the destination
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// file SAME.
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if (srcDesc.getIndirection().equals(dstDesc.getPath()))
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|
{
|
|
return AVMDifference.SAME;
|
|
}
|
|
// We know that they are in conflict since they are of different types.
|
|
return AVMDifference.CONFLICT;
|
|
}
|
|
// Destination is a layered file also.
|
|
AVMNodeDescriptor common = fAVMService.getCommonAncestor(srcDesc, dstDesc);
|
|
if (common == null)
|
|
{
|
|
return AVMDifference.CONFLICT;
|
|
}
|
|
if (common.getId() == srcDesc.getId())
|
|
{
|
|
return AVMDifference.OLDER;
|
|
}
|
|
if (common.getId() == dstDesc.getId())
|
|
{
|
|
return AVMDifference.NEWER;
|
|
}
|
|
// Finally we know they are in conflict.
|
|
return AVMDifference.CONFLICT;
|
|
}
|
|
// Source is a plain file.
|
|
if (dstDesc.isLayeredFile())
|
|
{
|
|
// We consider a source file that is the target of a layered destination file to be
|
|
// SAME.
|
|
if (dstDesc.getIndirection().equals(srcDesc.getPath()))
|
|
{
|
|
return AVMDifference.SAME;
|
|
}
|
|
// Otherwise we know they are in conflict because they are of different type.
|
|
return AVMDifference.CONFLICT;
|
|
}
|
|
// Destination is a plain file.
|
|
AVMNodeDescriptor common = fAVMService.getCommonAncestor(srcDesc, dstDesc);
|
|
// Conflict case.
|
|
if (common == null)
|
|
{
|
|
return AVMDifference.CONFLICT;
|
|
}
|
|
if (common.getId() == srcDesc.getId())
|
|
{
|
|
return AVMDifference.OLDER;
|
|
}
|
|
if (common.getId() == dstDesc.getId())
|
|
{
|
|
return AVMDifference.NEWER;
|
|
}
|
|
// The must, finally, be in conflict.
|
|
return AVMDifference.CONFLICT;
|
|
}
|
|
|
|
/**
|
|
* Flattens a layer so that all all nodes under and including
|
|
* <code>layerPath</code> become translucent to any nodes in the
|
|
* corresponding location under and including <code>underlyingPath</code>
|
|
* that are the same version.
|
|
* @param layerPath The overlying layer path.
|
|
* @param underlyingPath The underlying path.
|
|
*/
|
|
public void flatten(String layerPath, String underlyingPath)
|
|
{
|
|
if (layerPath == null || underlyingPath == null)
|
|
{
|
|
throw new AVMBadArgumentException("Illegal null path.");
|
|
}
|
|
AVMNodeDescriptor layerNode = fAVMService.lookup(-1, layerPath);
|
|
if (layerNode == null)
|
|
{
|
|
throw new AVMNotFoundException("Not found: " + layerPath);
|
|
}
|
|
AVMNodeDescriptor underlyingNode = fAVMService.lookup(-1, underlyingPath);
|
|
if (underlyingNode == null)
|
|
{
|
|
throw new AVMNotFoundException("Not found: " + underlyingPath);
|
|
}
|
|
flatten(layerNode, underlyingNode);
|
|
}
|
|
|
|
/**
|
|
* This is the implementation of flatten.
|
|
* @param layer The on top node.
|
|
* @param underlying The underlying node.
|
|
*/
|
|
private boolean flatten(AVMNodeDescriptor layer, AVMNodeDescriptor underlying)
|
|
{
|
|
if (!layer.isLayeredDirectory())
|
|
{
|
|
return false;
|
|
}
|
|
// layer and underlying must match for flattening to be useful.
|
|
if (!layer.getIndirection().equals(underlying.getPath()))
|
|
{
|
|
return false;
|
|
}
|
|
// The underlying thing must be a directory.
|
|
if (!underlying.isDirectory())
|
|
{
|
|
throw new AVMWrongTypeException("Underlying is not a directory: " + underlying);
|
|
}
|
|
Map<String, AVMNodeDescriptor> layerListing =
|
|
fAVMService.getDirectoryListingDirect(layer, true);
|
|
// If the layer is empty (directly, that is) we're done.
|
|
if (layerListing.size() == 0)
|
|
{
|
|
return true;
|
|
}
|
|
layer = fAVMService.forceCopy(layer.getPath());
|
|
// Grab the listing
|
|
Map<String, AVMNodeDescriptor> underListing =
|
|
fAVMService.getDirectoryListing(underlying, true);
|
|
boolean flattened = true;
|
|
for (String name : layerListing.keySet())
|
|
{
|
|
AVMNodeDescriptor topNode = layerListing.get(name);
|
|
AVMNodeDescriptor bottomNode = underListing.get(name);
|
|
if (bottomNode == null)
|
|
{
|
|
continue;
|
|
}
|
|
// We've found an identity so flatten it.
|
|
if (topNode.getId() == bottomNode.getId())
|
|
{
|
|
fAVMRepository.flatten(layer, name);
|
|
}
|
|
else
|
|
{
|
|
// Otherwise recursively flatten the children.
|
|
if (flatten(topNode, bottomNode))
|
|
{
|
|
fAVMRepository.flatten(layer, name);
|
|
}
|
|
else
|
|
{
|
|
flattened = false;
|
|
}
|
|
}
|
|
}
|
|
return flattened;
|
|
}
|
|
|
|
/**
|
|
* Takes a layer, deletes it and recreates it pointing at the same underlying
|
|
* node. Any changes in the layer are lost (except to history if the layer has been
|
|
* snapshotted.)
|
|
* @param layerPath
|
|
*/
|
|
public void resetLayer(String layerPath)
|
|
{
|
|
AVMNodeDescriptor desc = fAVMService.lookup(-1, layerPath);
|
|
if (desc == null)
|
|
{
|
|
throw new AVMNotFoundException("Not Found: " + layerPath);
|
|
}
|
|
String [] parts = AVMNodeConverter.SplitBase(layerPath);
|
|
fAVMService.removeNode(parts[0], parts[1]);
|
|
fAVMService.createLayeredDirectory(desc.getIndirection(), parts[0], parts[1]);
|
|
}
|
|
}
|