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https://github.com/Alfresco/alfresco-community-repo.git
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Merge DEV to HEAD
ContentDiskDriver rework. git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@29451 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Mark Rogers
@@ -0,0 +1,340 @@
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/*
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* Copyright (C) 2005-2010 Alfresco Software Limited.
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*
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* This file is part of Alfresco
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*
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* Alfresco is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Alfresco is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Alfresco. If not, see <http://www.gnu.org/licenses/>. */
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package org.alfresco.filesys.alfresco;
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import java.io.IOException;
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import java.util.concurrent.Callable;
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import javax.transaction.Status;
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import javax.transaction.UserTransaction;
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import org.alfresco.error.AlfrescoRuntimeException;
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import org.alfresco.jlan.server.SrvSession;
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import org.alfresco.jlan.server.core.DeviceContext;
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import org.alfresco.jlan.server.core.DeviceContextException;
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import org.alfresco.jlan.server.filesys.IOControlNotImplementedException;
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import org.alfresco.jlan.server.filesys.IOCtlInterface;
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import org.alfresco.jlan.server.filesys.NetworkFile;
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import org.alfresco.jlan.server.filesys.TransactionalFilesystemInterface;
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import org.alfresco.jlan.server.filesys.TreeConnection;
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import org.alfresco.jlan.smb.SMBException;
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import org.alfresco.jlan.smb.SMBStatus;
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import org.alfresco.jlan.util.DataBuffer;
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import org.alfresco.repo.transaction.RetryingTransactionHelper;
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import org.alfresco.service.ServiceRegistry;
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import org.alfresco.service.transaction.TransactionService;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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/**
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* Alfresco Tx Disk Driver Base Class
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*
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* <p>Provides common code to the Alfresco filesystem implementations.
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*
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* @author gkspencer
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*/
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public abstract class AlfrescoTxDiskDriver extends AlfrescoDiskDriver implements TransactionalFilesystemInterface
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{
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private static final Log logger = LogFactory.getLog(AlfrescoTxDiskDriver.class);
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// Remember whether the current thread is already in a retrying transaction
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private ThreadLocal<Boolean> m_inRetryingTransaction = new ThreadLocal<Boolean>();
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/**
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* Begin a read-only transaction
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*
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* @param sess SrvSession
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*/
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public void beginReadTransaction(SrvSession sess) {
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beginTransaction( sess, true);
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}
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/**
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* Begin a writeable transaction
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*
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* @param sess SrvSession
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*/
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public void beginWriteTransaction(SrvSession sess) {
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beginTransaction( sess, false);
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}
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/**
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* Perform a retryable operation in a write transaction
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* <p>
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* WARNING : side effect - that the current transaction, if any, is ended.
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*
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*
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* @param sess
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* the server session
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* @param callback
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* callback for the retryable operation
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* @return the result of the operation
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* @throws Exception
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*/
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public <T> T doInWriteTransaction(SrvSession sess, final CallableIO<T> callback)
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throws IOException
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{
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Boolean wasInRetryingTransaction = m_inRetryingTransaction.get();
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try
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{
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boolean hadTransaction = sess.hasTransaction();
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if (hadTransaction)
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{
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sess.endTransaction();
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}
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m_inRetryingTransaction.set(Boolean.TRUE);
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T result = m_transactionService.getRetryingTransactionHelper().doInTransaction(
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new RetryingTransactionHelper.RetryingTransactionCallback<T>()
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{
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public T execute() throws Throwable
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{
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try
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{
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return callback.call();
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}
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catch (IOException e)
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{
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// Ensure original checked IOExceptions get propagated
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throw new PropagatingException(e);
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}
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}
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});
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if (hadTransaction)
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{
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beginReadTransaction(sess);
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}
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return result;
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}
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catch (PropagatingException e)
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{
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// Unwrap checked exceptions
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throw (IOException) e.getCause();
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}
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finally
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{
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m_inRetryingTransaction.set(wasInRetryingTransaction);
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}
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}
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/**
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* End an active transaction
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*
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* @param sess SrvSession
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* @param tx Object
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*/
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public void endTransaction(SrvSession sess, Object tx) {
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// Check that the transaction object is valid
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if ( tx == null)
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return;
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// Get the filesystem transaction
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FilesysTransaction filesysTx = (FilesysTransaction) tx;
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// Check if there is an active transaction
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if ( filesysTx != null && filesysTx.hasTransaction())
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{
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// Get the active transaction
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UserTransaction ftx = filesysTx.getTransaction();
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try
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{
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// Commit or rollback the transaction
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if ( ftx.getStatus() == Status.STATUS_MARKED_ROLLBACK ||
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ftx.getStatus() == Status.STATUS_ROLLEDBACK ||
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ftx.getStatus() == Status.STATUS_ROLLING_BACK)
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{
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// Transaction is marked for rollback
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ftx.rollback();
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// DEBUG
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if ( logger.isDebugEnabled())
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logger.debug("End transaction (rollback)");
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}
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else
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{
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// Commit the transaction
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ftx.commit();
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// DEBUG
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if ( logger.isDebugEnabled())
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logger.debug("End transaction (commit)");
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}
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}
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catch ( Exception ex)
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{
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if ( logger.isDebugEnabled())
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logger.debug("Failed to end transaction, " + ex.getMessage());
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// throw new AlfrescoRuntimeException("Failed to end transaction", ex);
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}
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finally
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{
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// Clear the current transaction
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sess.clearTransaction();
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}
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}
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}
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/**
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* Create and start a transaction, if not already active
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*
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* @param sess SrvSession
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* @param readOnly boolean
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* @exception AlfrescoRuntimeException
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*/
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private final void beginTransaction( SrvSession sess, boolean readOnly)
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throws AlfrescoRuntimeException
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{
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// Do nothing if we are already in a retrying transaction
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Boolean inRetryingTransaction = m_inRetryingTransaction.get();
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if (inRetryingTransaction != null && inRetryingTransaction)
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{
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return;
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}
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// Initialize the per session thread local that holds the transaction
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sess.initializeTransactionObject();
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// Get the filesystem transaction
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FilesysTransaction filesysTx = (FilesysTransaction) sess.getTransactionObject().get();
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if ( filesysTx == null)
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{
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filesysTx = new FilesysTransaction();
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sess.getTransactionObject().set( filesysTx);
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}
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// If there is an active transaction check that it is the required type
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if ( filesysTx.hasTransaction())
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{
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// Get the active transaction
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UserTransaction tx = filesysTx.getTransaction();
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// Check if the current transaction is marked for rollback
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try
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{
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if ( tx.getStatus() == Status.STATUS_MARKED_ROLLBACK ||
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tx.getStatus() == Status.STATUS_ROLLEDBACK ||
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tx.getStatus() == Status.STATUS_ROLLING_BACK)
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{
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// Rollback the current transaction
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tx.rollback();
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}
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}
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catch ( Exception ex)
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{
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}
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// Check if the transaction is a write transaction, if write has been requested
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if ( readOnly == false && filesysTx.isReadOnly() == true)
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{
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// Commit the read-only transaction
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try
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{
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tx.commit();
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}
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catch ( Exception ex)
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{
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throw new AlfrescoRuntimeException("Failed to commit read-only transaction, " + ex.getMessage());
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}
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finally
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{
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// Clear the active transaction
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filesysTx.clearTransaction();
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}
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}
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}
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// Create the transaction
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if ( filesysTx.hasTransaction() == false)
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{
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try
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{
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// Create a new transaction
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UserTransaction userTrans = m_transactionService.getUserTransaction(readOnly);
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userTrans.begin();
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// Store the transaction
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filesysTx.setTransaction( userTrans, readOnly);
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// DEBUG
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if ( logger.isDebugEnabled())
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logger.debug("Created transaction readOnly=" + readOnly);
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}
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catch (Exception ex)
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{
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throw new AlfrescoRuntimeException("Failed to create transaction, " + ex.getMessage());
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}
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}
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// Store the transaction callback
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sess.setTransaction( this);
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}
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/**
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* An extended {@link Callable} that throws {@link IOException}s.
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*
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* @param <V>
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*/
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public interface CallableIO <V> extends Callable<V>
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{
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public V call() throws IOException;
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}
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/**
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* A wrapper for checked exceptions to be passed through the retrying transaction handler.
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*/
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protected static class PropagatingException extends RuntimeException
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{
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private static final long serialVersionUID = 1L;
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/**
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* @param cause
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*/
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public PropagatingException(Throwable cause)
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{
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super(cause);
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}
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}
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}
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