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Workaround for Java problem on Windows with releasing buffers for memory-mapped files

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java.io.FileNotFoundException: C:\workspace\junit-workspace\.metadata\.plugins\org.eclipse.cdt.core\language.settings.xml (The requested operation cannot be performed on a file with a user-mapped section open)
	at java.io.FileOutputStream.open(Native Method)
	at java.io.FileOutputStream.<init>(Unknown Source)
	at java.io.FileOutputStream.<init>(Unknown Source)
	at org.eclipse.cdt.internal.core.XmlUtil.getFileOutputStreamWorkaround(XmlUtil.java:315)
	at org.eclipse.cdt.internal.core.XmlUtil.serializeXml(XmlUtil.java:290)
	at org.eclipse.cdt.internal.core.language.settings.providers.LanguageSettingsProvidersSerializer.serializeLanguageSettingsWorkspace(LanguageSettingsProvidersSerializer.java:539)
	at org.eclipse.cdt.internal.core.language.settings.providers.LanguageSettingsProvidersSerializer$1.runInWorkspace(LanguageSettingsProvidersSerializer.java:577)
	at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
This commit is contained in:
Andrew Gvozdev 2012-04-16 14:41:19 -04:00
parent 2bd9d517fb
commit 955bd297b2
1 changed files with 51 additions and 6 deletions
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57
core/org.eclipse.cdt.core/utils/org/eclipse/cdt/internal/core/XmlUtil.java
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@ -13,6 +13,7 @@ package org.eclipse.cdt.internal.core;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
@ -228,13 +229,16 @@ public class XmlUtil {
return null;
}
InputStream xmlStream;
try {
xmlStream = new FileInputStream(xmlFile);
InputStream xmlStream = new FileInputStream(xmlFile);
try {
return loadXml(xmlStream);
} finally {
xmlStream.close();
}
} catch (Exception e) {
throw new CoreException(CCorePlugin.createStatus(Messages.XmlUtil_InternalErrorLoading, e));
}
return loadXml(xmlStream);
}
/**
@ -245,8 +249,16 @@ public class XmlUtil {
* @throws CoreException if something goes wrong.
*/
public static Document loadXml(IFile xmlFile) throws CoreException {
InputStream xmlStream = xmlFile.getContents();
return loadXml(xmlStream);
try {
InputStream xmlStream = xmlFile.getContents();
try {
return loadXml(xmlStream);
} finally {
xmlStream.close();
}
} catch (Exception e) {
throw new CoreException(CCorePlugin.createStatus(Messages.XmlUtil_InternalErrorLoading, e));
}
}
/**
@ -273,13 +285,46 @@ public class XmlUtil {
XmlUtil.prettyFormat(doc);
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(new FileOutputStream(storeFile));
StreamResult result = new StreamResult(getFileOutputStreamWorkaround(storeFile));
transformer.transform(source, result);
result.getOutputStream().close();
ResourcesUtil.refreshWorkspaceFiles(uriLocation);
}
/**
* Workaround for Java problem on Windows with releasing buffers for memory-mapped files.
*
* @see "http://stackoverflow.com/questions/3602783/file-access-synchronized-on-java-object"
* @see "http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6354433"
* @see "http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4715154"
* @see "http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4469299"
*/
private static FileOutputStream getFileOutputStreamWorkaround(java.io.File storeFile) throws FileNotFoundException {
final int maxCount = 10;
for (int i = 0; i <= maxCount; i++) {
try {
// there is no sleep on first round
Thread.sleep(10 * i);
} catch (InterruptedException e) {
// restore interrupted status
Thread.currentThread().interrupt();
}
try {
return new FileOutputStream(storeFile);
} catch (FileNotFoundException e) {
// only apply workaround for the very specific exception
if (i >= maxCount || !e.getMessage().contains("The requested operation cannot be performed on a file with a user-mapped section open")) { //$NON-NLS-1$
throw e;
}
// CCorePlugin.log(new Status(IStatus.INFO, CCorePlugin.PLUGIN_ID, "Workaround for concurrent access to memory-mapped files applied, attempt " + (i + 1), e)); //$NON-NLS-1$
}
}
// will never get here
return null;
}
/**
* Serialize XML Document into a byte array.
* @param doc - DOM Document to serialize.