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ALF-10052 - Channel Exception when reading file

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git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@30470 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Mark Rogers
2011-09-13 13:00:59 +00:00
parent e40265f1a1
commit 271595f862
1 changed files with 185 additions and 159 deletions
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334
source/java/org/alfresco/filesys/repo/ContentNetworkFile.java
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@@ -68,26 +68,20 @@ public class ContentNetworkFile extends NodeRefNetworkFile
private static final Log logger = LogFactory.getLog(ContentNetworkFile.class); private static final Log logger = LogFactory.getLog(ContentNetworkFile.class);
// Services // Services
private NodeService nodeService; private NodeService nodeService;
private ContentService contentService; private ContentService contentService;
private MimetypeService mimetypeService; private MimetypeService mimetypeService;
// File channel to file content
private FileChannel channel; private FileChannel channel; // File channel to file content
private ContentAccessor content; // content
// File content
private ContentAccessor content;
private String preUpdateContentURL; private String preUpdateContentURL;
// Indicate if file has been written to or truncated/resized // Indicate if file has been written to or truncated/resized
private boolean modified; private boolean modified;
// Flag to indicate if the file channel is writable // Flag to indicate if the file channel is writable
private boolean writableChannel; private boolean writableChannel;
/** /**
@@ -265,6 +259,8 @@ public class ContentNetworkFile extends NodeRefNetworkFile
/** /**
* Opens the channel for reading or writing depending on the access mode. * Opens the channel for reading or writing depending on the access mode.
* <p> * <p>
* Side effect: sets fileSize
* <p>
* If the channel is already open, it is left. * If the channel is already open, it is left.
* *
* @param write true if the channel must be writable * @param write true if the channel must be writable
@@ -277,122 +273,137 @@ public class ContentNetworkFile extends NodeRefNetworkFile
* @see NetworkFile#WRITEONLY * @see NetworkFile#WRITEONLY
* @see NetworkFile#READWRITE * @see NetworkFile#READWRITE
*/ */
protected void openContent(boolean write, boolean trunc) public void openContent(boolean write, boolean trunc)
throws AccessDeniedException, AlfrescoRuntimeException throws AccessDeniedException, AlfrescoRuntimeException
{ {
// Check if the file is a directory // Check if the file is a directory
if (isDirectory()) if (isDirectory())
{ {
throw new AlfrescoRuntimeException("Unable to open channel for a directory network file: " + this); throw new AlfrescoRuntimeException("Unable to open content for a directory network file: " + this);
}
if(channel != null && !write)
{
if(logger.isDebugEnabled())
{
logger.debug("channel is already open for read-only");
}
return;
} }
// Check if write access is required and the current channel is read-only // Check if write access is required and the current channel is read-only
else if ( write && writableChannel == false && channel != null) // update of channel and content member variables need to be serialized
synchronized(this)
{ {
// Close the existing read-only channel if ( write && writableChannel == false && channel != null)
{
// Close the existing read-only channel
try try
{ {
channel.close(); channel.close();
channel = null; channel = null;
content = null;
}
catch (IOException ex)
{
logger.error("Error closing read-only channel", ex);
}
// Debug
if ( logger.isDebugEnabled())
{
logger.debug("Switching to writable channel for " + getName());
}
} }
catch (IOException ex) else if (channel != null)
{ {
logger.error("Error closing read-only channel", ex); // Already have read/write channel open
return;
} }
// Debug // We need to create the channel
if ( logger.isDebugEnabled()) if (write && !isWritable())
logger.debug("Switching to writable channel for " + getName());
}
else if (channel != null)
{
// Already have channel open
return;
}
// We need to create the channel
if (write && !isWritable())
{
throw new AccessDeniedException("The network file was created for read-only: " + this);
}
content = null;
preUpdateContentURL = null;
if (write)
{
// Get a writeable channel to the content, along with the original content
if(logger.isDebugEnabled())
{ {
logger.debug("get writer for content property"); throw new AccessDeniedException("The network file was created for read-only: " + this);
} }
content = contentService.getWriter( getNodeRef(), ContentModel.PROP_CONTENT, false); preUpdateContentURL = null;
// Keep the original content for later comparison // Need to open content for write
if (write)
ContentData preUpdateContentData = (ContentData) nodeService.getProperty( getNodeRef(), ContentModel.PROP_CONTENT);
if (preUpdateContentData != null)
{ {
preUpdateContentURL = preUpdateContentData.getContentUrl(); // Get a writeable channel to the content, along with the original content
if(logger.isDebugEnabled())
{
logger.debug("open writer for content property");
}
content = contentService.getWriter( getNodeRef(), ContentModel.PROP_CONTENT, false);
// Keep the original content for later comparison
ContentData preUpdateContentData = (ContentData) nodeService.getProperty( getNodeRef(), ContentModel.PROP_CONTENT);
if (preUpdateContentData != null)
{
preUpdateContentURL = preUpdateContentData.getContentUrl();
}
// Indicate that we have a writable channel to the file
writableChannel = true;
// Get the writable channel, do not copy existing content data if the file is to be truncated
channel = ((ContentWriter) content).getFileChannel( trunc);
} }
else
// Indicate that we have a writable channel to the file
writableChannel = true;
// Get the writable channel, do not copy existing content data if the file is to be truncated
channel = ((ContentWriter) content).getFileChannel( trunc);
}
else
{
// Get a read-only channel to the content
if(logger.isDebugEnabled())
{ {
logger.debug("get reader for content property"); // Get a read-only channel to the content
} if(logger.isDebugEnabled())
{
logger.debug("open reader for content property");
}
content = contentService.getReader( getNodeRef(), ContentModel.PROP_CONTENT); content = contentService.getReader( getNodeRef(), ContentModel.PROP_CONTENT);
// Ensure that the content we are going to read is valid // Ensure that the content we are going to read is valid
content = FileContentReader.getSafeContentReader( content = FileContentReader.getSafeContentReader(
(ContentReader) content, (ContentReader) content,
I18NUtil.getMessage(FileContentReader.MSG_MISSING_CONTENT), I18NUtil.getMessage(FileContentReader.MSG_MISSING_CONTENT),
getNodeRef(), content); getNodeRef(), content);
// Indicate that we only have a read-only channel to the data // Indicate that we only have a read-only channel to the data
writableChannel = false; writableChannel = false;
// Get the read-only channel // Get the read-only channel
channel = ((ContentReader) content).getFileChannel(); channel = ((ContentReader) content).getFileChannel();
}
// Update the current file size
if ( channel != null)
{
try
{
setFileSize(channel.size());
}
catch (IOException ex)
{
logger.error( ex);
} }
// Indicate that the file is open // Update the current file size
setClosed( false); if ( channel != null)
} {
try
{
setFileSize(channel.size());
}
catch (IOException ex)
{
logger.error( ex);
}
// Indicate that the file is open
setClosed( false);
}
} // release lock
} }
/** /**
@@ -420,9 +431,8 @@ public class ContentNetworkFile extends NodeRefNetworkFile
setClosed( true); setClosed( true);
return; return;
} }
else if (!hasContent()) else if (!hasContent()) {
{ // File was not read/written so content was not opened
// File was not read/written so channel was not opened
if(logger.isDebugEnabled()) if(logger.isDebugEnabled())
{ {
logger.debug("no content to write - nothing to do"); logger.debug("no content to write - nothing to do");
@@ -434,18 +444,27 @@ public class ContentNetworkFile extends NodeRefNetworkFile
// Check if the file has been modified // Check if the file has been modified
if (modified) // update of channel and content member variables need to be serialized
synchronized(this)
{ {
if(logger.isDebugEnabled())
{
logger.debug("content has been modified");
}
NodeRef contentNodeRef = getNodeRef();
ContentWriter writer = (ContentWriter)content;
// We may be in a retry block, in which case this section will already have executed and channel will be null if (modified)
if (channel != null)
{ {
if(logger.isDebugEnabled())
{
logger.debug("content has been modified");
}
NodeRef contentNodeRef = getNodeRef();
ContentWriter writer = (ContentWriter)content;
// We may be in a retry block, in which case this section will already have executed and channel will be null
if (channel != null)
{
// Close the channel
channel.close();
channel = null;
}
// Do we need the mimetype guessing for us when we're done? // Do we need the mimetype guessing for us when we're done?
if (content.getMimetype() == null || content.getMimetype().equals(MimetypeMap.MIMETYPE_BINARY) ) if (content.getMimetype() == null || content.getMimetype().equals(MimetypeMap.MIMETYPE_BINARY) )
{ {
@@ -456,73 +475,79 @@ public class ContentNetworkFile extends NodeRefNetworkFile
// We always want the encoding guessing // We always want the encoding guessing
writer.guessEncoding(); writer.guessEncoding();
// Close the channel // Retrieve the content data and stop the content URL from being 'eagerly deleted', in case we need to
channel.close(); // retry the transaction
channel = null;
}
// Retrieve the content data and stop the content URL from being 'eagerly deleted', in case we need to final ContentData contentData = content.getContentData();
// retry the transaction
final ContentData contentData = content.getContentData(); // Update node properties, but only if the binary has changed (ETHREEOH-1861)
// Update node properties, but only if the binary has changed (ETHREEOH-1861) ContentReader postUpdateContentReader = writer.getReader();
ContentReader postUpdateContentReader = writer.getReader(); RunAsWork<ContentReader> getReader = new RunAsWork<ContentReader>()
RunAsWork<ContentReader> getReader = new RunAsWork<ContentReader>()
{
public ContentReader doWork() throws Exception
{ {
return preUpdateContentURL == null ? null : contentService.getRawReader(preUpdateContentURL); public ContentReader doWork() throws Exception
} {
}; return preUpdateContentURL == null ? null : contentService.getRawReader(preUpdateContentURL);
ContentReader preUpdateContentReader = AuthenticationUtil.runAs(getReader, AuthenticationUtil.getSystemUserName()); }
};
ContentReader preUpdateContentReader = AuthenticationUtil.runAs(getReader, AuthenticationUtil.getSystemUserName());
boolean contentChanged = preUpdateContentURL == null boolean contentChanged = preUpdateContentURL == null
|| !AbstractContentReader.compareContentReaders(preUpdateContentReader, || !AbstractContentReader.compareContentReaders(preUpdateContentReader,
postUpdateContentReader); postUpdateContentReader);
if (contentChanged) if (contentChanged)
{
if(logger.isDebugEnabled())
{
logger.debug("content has changed - remove ASPECT_NO_CONTENT");
}
nodeService.removeAspect(contentNodeRef, ContentModel.ASPECT_NO_CONTENT);
try
{
nodeService.setProperty( contentNodeRef, ContentModel.PROP_CONTENT, contentData);
}
catch (ContentQuotaException qe)
{
content = null;
setClosed( true);
throw new DiskFullException(qe.getMessage());
}
}
// Tidy up after ourselves after a successful commit. Otherwise leave things to allow a retry.
AlfrescoTransactionSupport.bindListener(new TransactionListenerAdapter()
{
@Override
public void afterCommit()
{
synchronized(this)
{
if(channel == null)
{
content = null;
preUpdateContentURL = null;
setClosed( true);
}
}
}
});
}
else if (channel != null)
{ {
// Close it - it was not modified
if(logger.isDebugEnabled()) if(logger.isDebugEnabled())
{ {
logger.debug("content has changed - remove ASPECT_NO_CONTENT"); logger.debug("content not modified - simply close the channel");
}
nodeService.removeAspect(contentNodeRef, ContentModel.ASPECT_NO_CONTENT);
try
{
nodeService.setProperty( contentNodeRef, ContentModel.PROP_CONTENT, contentData);
}
catch (ContentQuotaException qe)
{
throw new DiskFullException(qe.getMessage());
} }
channel.close();
channel = null;
content = null;
setClosed(true);
} }
// Tidy up after ourselves after a successful commit. Otherwise leave things to allow a retry.
AlfrescoTransactionSupport.bindListener(new TransactionListenerAdapter()
{
@Override
public void afterCommit()
{
content = null;
preUpdateContentURL = null;
setClosed( true);
}
});
}
else if (channel != null)
{
// Close it - it was not modified
if(logger.isDebugEnabled())
{
logger.debug("content not modified - simply close the channel");
}
channel.close();
channel = null;
} }
} }
@@ -601,9 +626,9 @@ public class ContentNetworkFile extends NodeRefNetworkFile
public void writeFile(byte[] buffer, int length, int position, long fileOffset) public void writeFile(byte[] buffer, int length, int position, long fileOffset)
throws IOException throws IOException
{ {
try { try
{
// Open the channel for writing // Open the channel for writing
openContent(true, false); openContent(true, false);
} }
catch ( ContentIOException ex) { catch ( ContentIOException ex) {
@@ -842,4 +867,5 @@ public class ContentNetworkFile extends NodeRefNetworkFile
} }
return false; return false;
} }
} }