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Code Issues Wiki Activity

Bug 292851 - Made RefactoringASTCache thread-safe.

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This commit is contained in:
Sergey Prigogin 2011-03-05 07:55:22 +00:00
parent 63b1a31bb5
commit 9e671a6111
1 changed files with 39 additions and 24 deletions
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63
core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/RefactoringASTCache.java
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@ -10,8 +10,8 @@
*******************************************************************************/
package org.eclipse.cdt.internal.ui.refactoring;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
@ -38,21 +38,26 @@ import org.eclipse.cdt.internal.ui.editor.ASTProvider;
* Cache containing ASTs for the translation units participating in refactoring.
* The cache object has to be disposed of after use. Failure to do so may cause
* loss of index lock.
*
* This class is thread-safe.
*/
public class RefactoringASTCache implements IDisposable {
private final Map<ITranslationUnit, IASTTranslationUnit> fASTCache;
private final Object astBuildMutex;
private IIndex fIndex;
private Map<ITranslationUnit, IASTTranslationUnit> fASTCache;
private boolean fDisposed;
public RefactoringASTCache() {
fASTCache = new HashMap<ITranslationUnit, IASTTranslationUnit>();
fASTCache = new ConcurrentHashMap<ITranslationUnit, IASTTranslationUnit>();
astBuildMutex = new Object();
}
/**
* Returns an AST for the given translation unit. The AST is built for the working
* copy of the translation unit if such working copy exists. The returned AST is a shared
* one whenever possible.
* NOTE: No references to the AST or its nodes can be kept after calling the {@link #dispose()} method.
* copy of the translation unit if such working copy exists. The returned AST is
* a shared one whenever possible.
* NOTE: No references to the AST or its nodes can be kept after calling
* the {@link #dispose()} method.
* @param tu The translation unit.
* @param pm A progress monitor.
* @return An AST, or <code>null</code> if the AST cannot be obtained.
@ -60,20 +65,12 @@ public class RefactoringASTCache implements IDisposable {
public IASTTranslationUnit getAST(ITranslationUnit tu, IProgressMonitor pm)
throws CoreException, OperationCanceledException {
Assert.isTrue(!fDisposed, "RefactoringASTCache is already disposed"); //$NON-NLS-1$
if (fIndex == null) {
ICProject[] projects;
projects = CoreModel.getDefault().getCModel().getCProjects();
IIndex index = CCorePlugin.getIndexManager().getIndex(projects);
try {
index.acquireReadLock();
} catch (InterruptedException e) {
throw new OperationCanceledException();
}
fIndex = index;
}
getIndex(); // Make sure the index is locked.
tu= CModelUtil.toWorkingCopy(tu);
IASTTranslationUnit ast= fASTCache.get(tu);
IASTTranslationUnit ast;
ast= fASTCache.get(tu);
if (ast == null) {
// Try to get a shared AST before creating our own.
final IASTTranslationUnit[] astHolder = new IASTTranslationUnit[1];
@ -86,11 +83,17 @@ public class RefactoringASTCache implements IDisposable {
}
});
ast = astHolder[0];
if (ast == null) {
int options= ITranslationUnit.AST_CONFIGURE_USING_SOURCE_CONTEXT |
ITranslationUnit.AST_SKIP_INDEXED_HEADERS;
ast= tu.getAST(fIndex, options);
fASTCache.put(tu, ast);
if (ast == null) {
synchronized (astBuildMutex) {
ast= fASTCache.get(tu);
if (ast == null) {
int options= ITranslationUnit.AST_CONFIGURE_USING_SOURCE_CONTEXT |
ITranslationUnit.AST_SKIP_INDEXED_HEADERS;
ast= tu.getAST(fIndex, options);
fASTCache.put(tu, ast);
}
}
}
}
if (pm != null) {
@ -104,13 +107,25 @@ public class RefactoringASTCache implements IDisposable {
*
* @return The index.
*/
public IIndex getIndex() {
public synchronized IIndex getIndex() throws CoreException, OperationCanceledException {
Assert.isTrue(!fDisposed, "RefactoringASTCache is already disposed"); //$NON-NLS-1$
if (fIndex == null) {
ICProject[] projects;
projects = CoreModel.getDefault().getCModel().getCProjects();
IIndex index = CCorePlugin.getIndexManager().getIndex(projects);
try {
index.acquireReadLock();
} catch (InterruptedException e) {
throw new OperationCanceledException();
}
fIndex = index;
}
return fIndex;
}
/**
* @see IDisposable#dispose()
* This method should not be called concurrently with any other method.
*/
public void dispose() {
Assert.isTrue(!fDisposed, "RefactoringASTCache.dispose() called more than once"); //$NON-NLS-1$