/*
* Copyright (C) 2005-2010 Alfresco Software Limited.
*
* This file is part of Alfresco
*
* Alfresco is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Alfresco is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Alfresco. If not, see .
*/
package org.alfresco.filesys.repo.rules;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.alfresco.filesys.repo.OpenFileMode;
import org.alfresco.filesys.repo.ResultCallback;
import org.alfresco.filesys.repo.TempNetworkFile;
import org.alfresco.filesys.repo.rules.ScenarioInstance.Ranking;
import org.alfresco.filesys.repo.rules.ScenarioRenameShuffleInstance.InternalState;
import org.alfresco.filesys.repo.rules.commands.CallbackCommand;
import org.alfresco.filesys.repo.rules.commands.CloseFileCommand;
import org.alfresco.filesys.repo.rules.commands.CompoundCommand;
import org.alfresco.filesys.repo.rules.commands.CopyContentCommand;
import org.alfresco.filesys.repo.rules.commands.CreateFileCommand;
import org.alfresco.filesys.repo.rules.commands.DeleteFileCommand;
import org.alfresco.filesys.repo.rules.commands.DoNothingCommand;
import org.alfresco.filesys.repo.rules.commands.OpenFileCommand;
import org.alfresco.filesys.repo.rules.commands.ReduceQuotaCommand;
import org.alfresco.filesys.repo.rules.commands.RemoveNoContentFileOnError;
import org.alfresco.filesys.repo.rules.commands.RemoveTempFileCommand;
import org.alfresco.filesys.repo.rules.commands.RenameFileCommand;
import org.alfresco.filesys.repo.rules.commands.ReturnValueCommand;
import org.alfresco.filesys.repo.rules.operations.CloseFileOperation;
import org.alfresco.filesys.repo.rules.operations.CreateFileOperation;
import org.alfresco.filesys.repo.rules.operations.DeleteFileOperation;
import org.alfresco.filesys.repo.rules.operations.OpenFileOperation;
import org.alfresco.filesys.repo.rules.operations.RenameFileOperation;
import org.alfresco.jlan.server.filesys.NetworkFile;
import org.alfresco.repo.transaction.AlfrescoTransactionSupport.TxnReadState;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* An open file scenario is ...
*
* 1) open(readOnly)
* 2) close(readOnly)
*
* 1) open(readOnly)
* 2) open(readWrite)
* 3) close(readOnly)
* 4 close(readWrite) updates the repo
*
* 1) open(readOnly)
* 2) open(readWrite)
* 3) open(readWrite) - does nothing. Increments Open Count.
* 4) close(readWrite) - does nothing. Decrements Open Count.
* 5) close(readWrite) - updates the repo.
* 6) close(readOnly) - closes read only
*
* 1) open (readWrite)
* 2) open (readOnly) - file already open for read/write
* 3) close
* 4) close
*
*/
class ScenarioOpenFileInstance implements ScenarioInstance, DependentInstance
{
private static Log logger = LogFactory.getLog(ScenarioOpenFileInstance.class);
private Date startTime = new Date();
private String name;
enum InternalState
{
NONE,
OPENING,
OPEN,
ERROR
} ;
InternalState state = InternalState.NONE;
/**
* For each read only open file
*/
private NetworkFile fileHandleReadOnly;
private int openReadOnlyCount = 0;
/**
* For each read/write open file
*/
private NetworkFile fileHandleReadWrite;
private int openReadWriteCount = 0;
/**
* Timeout in ms. Default 30 seconds.
*/
private long timeout = 30000;
private boolean isComplete = false;
private Ranking ranking = Ranking.HIGH;
/**
* Evaluate the next operation
* @param operation
*/
public Command evaluate(Operation operation)
{
/**
* Anti-pattern : timeout - this scenario does not timeout
*/
// Date now = new Date();
// if(now.getTime() > startTime.getTime() + getTimeout())
// {
// if(logger.isDebugEnabled())
// {
// logger.debug("Instance timed out");
// }
// }
/**
* Anti Pattern - Delete of the open file.
*/
if(operation instanceof DeleteFileOperation)
{
DeleteFileOperation d = (DeleteFileOperation)operation;
if(d.getName() == null)
{
return null;
}
if(name.equalsIgnoreCase(d.getName()))
{
logger.debug("Anti-Pattern - delete of the open file, scenario:" + this);
isComplete = true;
return null;
}
}
switch (state)
{
case NONE:
if(operation instanceof CreateFileOperation)
{
CreateFileOperation c = (CreateFileOperation)operation;
name = c.getName();
if(name != null)
{
state = InternalState.OPENING;
logger.debug("Create File name:" + name);
ArrayList commands = new ArrayList();
ArrayList postCommitCommands = new ArrayList();
ArrayList postErrorCommands = new ArrayList();
commands.add(new CreateFileCommand(c.getName(), c.getRootNodeRef(), c.getPath(), c.getAllocationSize()));
postCommitCommands.add(newOpenFileCallbackCommand());
postErrorCommands.add(newOpenFileErrorCallbackCommand());
return new CompoundCommand(commands, postCommitCommands, postErrorCommands);
}
}
else if(operation instanceof OpenFileOperation)
{
OpenFileOperation o = (OpenFileOperation)operation;
name = o.getName();
if(name != null)
{
state = InternalState.OPENING;
logger.debug("Open File name:" + name);
ArrayList commands = new ArrayList();
commands.add(new OpenFileCommand(o.getName(), o.getMode(), o.isTruncate(), o.getRootNodeRef(), o.getPath()));
ArrayList postCommitCommands = new ArrayList();
ArrayList postErrorCommands = new ArrayList();
postCommitCommands.add(newOpenFileCallbackCommand());
postErrorCommands.add(newOpenFileErrorCallbackCommand());
return new CompoundCommand(commands, postCommitCommands, postErrorCommands);
}
}
// Scenario Not Started
logger.debug("Scenario not started - no name");
isComplete = true;
return null;
case OPENING:
if(operation instanceof OpenFileOperation)
{
OpenFileOperation o = (OpenFileOperation)operation;
if(o.getName() == null)
{
return null;
}
if(name.equalsIgnoreCase(o.getName()))
{
/**
* TODO What to do here - one thread is in the middle of
* opening a file while another tries to open the same file
* sleep for a bit? then check state again? What happens if file
* closes while sleeping. For now log an error.
*/
logger.error("Second open while in opening state. :" + name);
// isComplete = true;
// return null;
}
}
/**
* Anti-pattern : timeout - is this needed ?
*/
Date now = new Date();
if(now.getTime() > startTime.getTime() + getTimeout())
{
if(logger.isDebugEnabled())
{
logger.debug("Instance in OPENING STATE timed out name" + name);
}
isComplete = true;
}
return null;
case ERROR:
logger.debug("Open has failed :" + name);
isComplete = true;
return null;
case OPEN:
if(operation instanceof CloseFileOperation)
{
CloseFileOperation c = (CloseFileOperation)operation;
if(c.getName() == null)
{
return null;
}
if(name.equalsIgnoreCase(c.getName()))
{
NetworkFile file = c.getNetworkFile();
if(isReadOnly(file))
{
// Read Only File
if(openReadOnlyCount == 1 || c.isForce())
{
if(logger.isDebugEnabled())
{
logger.debug("Close of last read only file handle:" + this);
}
openReadOnlyCount = 0;
if(openReadWriteCount <= 0)
{
if(logger.isDebugEnabled())
{
logger.debug("Scenario is complete:" + this);
}
isComplete=true;
}
if (file instanceof TempNetworkFile)
{
logger.debug("this is the last close of a temp read only file");
ArrayList commands = new ArrayList();
ArrayList postCommitCommands = new ArrayList();
commands.add(new CloseFileCommand(c.getName(), file, c.getRootNodeRef(), c.getPath()));
postCommitCommands.add(new RemoveTempFileCommand((TempNetworkFile)file));
return new CompoundCommand(commands, postCommitCommands);
}
else
{
return new CloseFileCommand(c.getName(), file, c.getRootNodeRef(), c.getPath());
}
}
if(logger.isDebugEnabled())
{
logger.debug("Only decrement count of read only file handle:" + this);
}
openReadOnlyCount--;
return new DoNothingCommand();
}
else
{
// This is a close of a Read Write File
// Read Only File
if(openReadWriteCount == 1 || c.isForce())
{
if(logger.isDebugEnabled())
{
logger.debug("Close of last read write file handle:" + this);
}
openReadWriteCount = 0;
if(openReadOnlyCount <= 0)
{
if(logger.isDebugEnabled())
{
logger.debug("Scenario is complete:" + this);
}
isComplete=true;
}
//
ArrayList commands = new ArrayList();
ArrayList postCommitCommands = new ArrayList();
ArrayList postErrorCommands = new ArrayList();
commands.add(new CloseFileCommand(c.getName(), file, c.getRootNodeRef(), c.getPath()));
//postErrorCommands.add(new RemoveNoContentFileOnError(c.getName(), c.getRootNodeRef(), c.getPath()));
if(c.isDeleteOnClose())
{
postCommitCommands.add(new ReduceQuotaCommand(c.getName(), file, c.getRootNodeRef(), c.getPath()));
}
if (file instanceof TempNetworkFile)
{
postCommitCommands.add(new RemoveTempFileCommand((TempNetworkFile)file));
}
return new CompoundCommand(commands, postCommitCommands, postErrorCommands);
}
if(logger.isDebugEnabled())
{
logger.debug("Only decrement count of read write file handle:" + this);
}
openReadWriteCount--;
return new DoNothingCommand();
}
}
}
else if(operation instanceof OpenFileOperation)
{
OpenFileOperation o = (OpenFileOperation)operation;
if(o.getName() == null)
{
return null;
}
if(name != null && name.equalsIgnoreCase(o.getName()))
{
if(o.getMode() == OpenFileMode.READ_WRITE)
{
// This is an open of a read write access
if(openReadWriteCount == 0)
{
logger.debug("Open first read/write from scenario:" + this);
ArrayList commands = new ArrayList();
commands.add(new OpenFileCommand(o.getName(), o.getMode(), o.isTruncate(), o.getRootNodeRef(), o.getPath()));
ArrayList postCommitCommands = new ArrayList();
postCommitCommands.add(newOpenFileCallbackCommand());
return new CompoundCommand(commands, postCommitCommands);
}
else
{
// TODO Need a permission check here and increment post check
openReadWriteCount++;
logger.debug("Return already open read/write file handle from scenario:" + this);
return new ReturnValueCommand(fileHandleReadWrite);
}
}
else
{
// This is an open for read only access
if(openReadWriteCount > 0)
{
//however the file is already open for read/write
openReadWriteCount++;
logger.debug("Return already open read/write file handle from scenario:" + this);
return new ReturnValueCommand(fileHandleReadWrite);
}
if(openReadOnlyCount == 0)
{
logger.debug("Open first read only from scenario:" + this);
ArrayList commands = new ArrayList();
commands.add(new OpenFileCommand(o.getName(), o.getMode(), o.isTruncate(), o.getRootNodeRef(), o.getPath()));
ArrayList postCommitCommands = new ArrayList();
postCommitCommands.add(newOpenFileCallbackCommand());
return new CompoundCommand(commands, postCommitCommands);
}
else
{
openReadOnlyCount++;
logger.debug("Return already open only file handle from scenario:" + this);
return new ReturnValueCommand(fileHandleReadOnly);
}
}
}
}
break;
}
return null;
}
@Override
public boolean isComplete()
{
return isComplete;
}
public String toString()
{
return "ScenarioOpenFileInstance name:" + name;
}
public void setTimeout(long timeout)
{
this.timeout = timeout;
}
public long getTimeout()
{
return timeout;
}
@Override
public Ranking getRanking()
{
return ranking;
}
public void setRanking(Ranking ranking)
{
this.ranking = ranking;
}
public String getName()
{
return name;
}
/**
* Called for open file.
*/
private ResultCallback newOpenFileCallbackCommand()
{
return new ResultCallback()
{
@Override
public void execute(Object result)
{
if(result instanceof NetworkFile)
{
// Now update the state of this scenario - we have an open fileHandle
NetworkFile fileHandle = (NetworkFile)result;
state = InternalState.OPEN;
if(isReadOnly(fileHandle))
{
openReadOnlyCount++;
fileHandleReadOnly=fileHandle;
if(logger.isDebugEnabled())
{
logger.debug("file opened read only:" + result + ", name:" + name);
}
}
else
{
openReadWriteCount++;
fileHandleReadWrite=fileHandle;
if(logger.isDebugEnabled())
{
logger.debug("file opened read write :" + result + ", name:" + name);
}
}
}
}
@Override
public TxnReadState getTransactionRequired()
{
return TxnReadState.TXN_NONE;
}
};
}
/**
* Called for open file error.
*/
private ResultCallback newOpenFileErrorCallbackCommand()
{
return new ResultCallback()
{
@Override
public void execute(Object result)
{
logger.debug("error handler - set state to error for name:" + name);
isComplete = true;
state = InternalState.ERROR;
}
@Override
public TxnReadState getTransactionRequired()
{
return TxnReadState.TXN_NONE;
}
};
}
private boolean isReadOnly(NetworkFile file)
{
return (file.getGrantedAccess() == NetworkFile.READONLY);
}
/* This openFileInstance knows about ScenarioDeleteRestore */
@Override
public Command win(List results, Command command)
{
if(command instanceof CompoundCommand)
{
CompoundCommand c = (CompoundCommand)command;
for(ScenarioResult looser : results)
{
if(looser.scenario instanceof ScenarioDeleteRestoreInstance)
{
Command l = looser.command;
ArrayList commands = new ArrayList();
ArrayList postCommitCommands = new ArrayList();
ArrayList postErrorCommands = new ArrayList();
commands.add(l);
postCommitCommands.addAll(c.getPostCommitCommands());
postErrorCommands.addAll(c.getPostErrorCommands());
logger.debug("returning merged high priority executor");
return new CompoundCommand(commands, postCommitCommands, postErrorCommands);
}
if(looser.scenario instanceof ScenarioDeleteOnCloseRenameInstance)
{
CompoundCommand l = (CompoundCommand)looser.command;
ArrayList commands = new ArrayList();
ArrayList postCommitCommands = new ArrayList();
ArrayList postErrorCommands = new ArrayList();
commands.addAll(c.getCommands());
postCommitCommands.addAll(c.getPostCommitCommands());
// Merge in the loosing post commit
postCommitCommands.addAll(l.getPostCommitCommands());
postErrorCommands.addAll(c.getPostErrorCommands());
logger.debug("returning merged high priority executor");
return new CompoundCommand(commands, postCommitCommands, postErrorCommands);
}
}
}
// No change
return command;
}
}