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AR-383: Optimized overwrite behaviour for ContentWriter. Content will only be duplicated for the writes if explicitly requesting a random-access file without the truncate option

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git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2254 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Derek Hulley
2006-01-31 05:40:51 +00:00
parent cdede309e5
commit 9bac8270f4
14 changed files with 571 additions and 242 deletions
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75
source/java/org/alfresco/repo/content/AbstractContentAccessor.java
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@@ -26,10 +26,10 @@ import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.List;
import org.alfresco.error.AlfrescoRuntimeException;
import org.alfresco.repo.transaction.TransactionUtil;
import org.alfresco.service.cmr.repository.ContentAccessor;
import org.alfresco.service.cmr.repository.ContentData;
import org.alfresco.service.cmr.repository.ContentIOException;
import org.alfresco.service.cmr.repository.ContentStreamListener;
import org.alfresco.service.transaction.TransactionService;
import org.apache.commons.logging.Log;
@@ -139,17 +139,36 @@ public abstract class AbstractContentAccessor implements ContentAccessor
this.encoding = encoding;
}
/**
* Generate a callback instance of the {@link FileChannel FileChannel}.
*
* @param directChannel the delegate that to perform the actual operations
* @param listeners the listeners to call
* @return Returns a new channel that functions just like the original, except
* that it issues callbacks to the listeners
* @throws ContentIOException
*/
protected FileChannel getCallbackFileChannel(
FileChannel directChannel,
List<ContentStreamListener> listeners)
throws ContentIOException
{
FileChannel ret = new CallbackFileChannel(directChannel, listeners);
// done
return ret;
}
/**
* Advise that listens for the completion of specific methods on the
* {@link java.nio.channels.ByteChannel} interface.
*
* @author Derek Hulley
*/
protected class ByteChannelCallbackAdvise implements AfterReturningAdvice
protected class ChannelCloseCallbackAdvise implements AfterReturningAdvice
{
private List<ContentStreamListener> listeners;
public ByteChannelCallbackAdvise(List<ContentStreamListener> listeners)
public ChannelCloseCallbackAdvise(List<ContentStreamListener> listeners)
{
this.listeners = listeners;
}
@@ -173,11 +192,6 @@ public abstract class AbstractContentAccessor implements ContentAccessor
// nothing to do
return;
}
// ensure that we are in a transaction
if (transactionService == null)
{
throw new AlfrescoRuntimeException("A transaction service is required when there are listeners present");
}
TransactionUtil.TransactionWork<Object> work = new TransactionUtil.TransactionWork<Object>()
{
public Object doWork()
@@ -190,11 +204,26 @@ public abstract class AbstractContentAccessor implements ContentAccessor
return null;
}
};
TransactionUtil.executeInUserTransaction(transactionService, work);
if (transactionService != null)
{
// just create a transaction
TransactionUtil.executeInUserTransaction(transactionService, work);
}
else
{
try
{
work.doWork();
}
catch (Exception e)
{
throw new ContentIOException("Failed to executed channel close callbacks", e);
}
}
// done
if (logger.isDebugEnabled())
{
logger.debug("Content listeners called: close");
logger.debug("" + listeners.size() + " content listeners called: close");
}
}
}
@@ -202,6 +231,10 @@ public abstract class AbstractContentAccessor implements ContentAccessor
/**
* Wraps a <code>FileChannel</code> to provide callbacks to listeners when the
* channel is {@link java.nio.channels.Channel#close() closed}.
* <p>
* This class is unfortunately necessary as the {@link FileChannel} doesn't have
* an single interface defining its methods, making it difficult to put an
* advice around the methods that require overriding.
*
* @author Derek Hulley
*/
@@ -253,7 +286,6 @@ public abstract class AbstractContentAccessor implements ContentAccessor
// nothing to do
return;
}
// create the work to update the listeners
TransactionUtil.TransactionWork<Object> work = new TransactionUtil.TransactionWork<Object>()
{
public Object doWork()
@@ -266,14 +298,29 @@ public abstract class AbstractContentAccessor implements ContentAccessor
return null;
}
};
TransactionUtil.executeInUserTransaction(transactionService, work);
if (transactionService != null)
{
// just create a transaction
TransactionUtil.executeInUserTransaction(transactionService, work);
}
else
{
try
{
work.doWork();
}
catch (Exception e)
{
throw new ContentIOException("Failed to executed channel close callbacks", e);
}
}
// done
if (logger.isDebugEnabled())
{
logger.debug("Content listeners called: close");
logger.debug("" + listeners.size() + " content listeners called: close");
}
}
@Override
public void force(boolean metaData) throws IOException
{