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Code Issues Wiki Activity

Simplified and doucmented synchronization in PDOMManager

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This commit is contained in:
Markus Schorn 2006-10-20 12:21:28 +00:00
parent d54cf4d243
commit fe98dbbe57
1 changed files with 105 additions and 67 deletions
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168
core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOMManager.java
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@ -87,12 +87,17 @@ public class PDOMManager implements IPDOMManager, IWritableIndexManager, IListen
}
};
/**
* Protects indexerJob, currentTask and taskQueue.
*/
private Object taskQueueMutex = new Object();
private PDOMIndexerJob indexerJob;
private IPDOMIndexerTask currentTask;
private LinkedList taskQueue = new LinkedList();
private Object taskQueueMutex = new Object();
private Object fWakeupOnIdle= new Object();
/**
* Stores mapping from pdom to project, used to serialize\ creation of new pdoms.
*/
private Map fPDOMs= new HashMap();
private ListenerList fChangeListeners= new ListenerList();
private ListenerList fStateListeners= new ListenerList();
@ -100,10 +105,13 @@ public class PDOMManager implements IPDOMManager, IWritableIndexManager, IListen
private IndexChangeEvent fIndexChangeEvent= new IndexChangeEvent();
private IndexerStateEvent fIndexerStateEvent= new IndexerStateEvent();
// classes that help out to make this one simpler
private IElementChangedListener fCModelListener= new CModelListener(this);
private IndexFactory fIndexFactory= new IndexFactory(this);
/**
* Serializes creation of new indexer, when acquiring the lock you are
* not allowed to hold a lock on fPDOMs.
*/
private Object fIndexerMutex= new Object();
private IPreferenceChangeListener fPreferenceChangeListener= new IPreferenceChangeListener(){
public void preferenceChange(PreferenceChangeEvent event) {
@ -200,7 +208,7 @@ public class PDOMManager implements IPDOMManager, IWritableIndexManager, IListen
}
}
public String getIndexerId(ICProject project) throws CoreException {
public String getIndexerId(ICProject project) {
IEclipsePreferences prefs = new ProjectScope(project.getProject()).getNode(CCorePlugin.PLUGIN_ID);
if (prefs == null)
return getDefaultIndexerId();
@ -240,7 +248,7 @@ public class PDOMManager implements IPDOMManager, IWritableIndexManager, IListen
return indexerId;
}
public void setIndexerId(final ICProject project, String indexerId) throws CoreException {
public void setIndexerId(final ICProject project, String indexerId) {
IEclipsePreferences prefs = new ProjectScope(project.getProject()).getNode(CCorePlugin.PLUGIN_ID);
if (prefs == null)
return; // TODO why would this be null?
@ -277,9 +285,8 @@ public class PDOMManager implements IPDOMManager, IWritableIndexManager, IListen
ICProject cproject= CoreModel.getDefault().create(project);
if (cproject != null) {
try {
String oldId= (String) event.getOldValue();
String newId= (String) event.getNewValue();
if (newId != null && !newId.equals(oldId)) {
if (newId != null) {
changeIndexer(cproject, newId);
}
}
@ -293,70 +300,90 @@ public class PDOMManager implements IPDOMManager, IWritableIndexManager, IListen
}
private void changeIndexer(ICProject cproject, String newid) throws CoreException {
IPDOMIndexer indexer= getIndexer(cproject, false);
if (indexer != null) {
stopIndexer(indexer);
assert !Thread.holdsLock(fPDOMs);
IPDOMIndexer oldIndexer= null;
synchronized (fIndexerMutex) {
oldIndexer= getIndexer(cproject, false);
if (oldIndexer != null) {
if (oldIndexer.getID().equals(newid)) {
return;
}
}
createIndexer(cproject, newid, true);
}
if (oldIndexer != null) {
stopIndexer(oldIndexer);
}
indexer= createIndexer(cproject, newid, true);
}
public IPDOMIndexer getIndexer(ICProject project, boolean create) {
try {
synchronized (fIndexerMutex) {
IProject rproject = project.getProject();
if (!rproject.isOpen()) {
return null;
}
IPDOMIndexer indexer = (IPDOMIndexer)rproject.getSessionProperty(indexerProperty);
assert !Thread.holdsLock(fPDOMs);
synchronized (fIndexerMutex) {
IProject rproject = project.getProject();
if (!rproject.isOpen()) {
return null;
}
if (indexer != null) {
ICProject indexerProject= indexer.getProject();
if (!project.equals(indexerProject)) {
indexer= null;
}
}
if (indexer == null && create) {
indexer = createIndexer(project, getIndexerId(project), false);
}
IPDOMIndexer indexer;
try {
indexer = (IPDOMIndexer)rproject.getSessionProperty(indexerProperty);
} catch (CoreException e) {
CCorePlugin.log(e);
return null;
}
if (indexer != null && indexer.getProject().equals(project)) {
return indexer;
}
} catch (CoreException e) {
CCorePlugin.log(e);
if (create) {
try {
return createIndexer(project, getIndexerId(project), false);
} catch (CoreException e) {
CCorePlugin.log(e);
}
}
return null;
}
}
private IPDOMIndexer createIndexer(ICProject project, String indexerId, boolean forceReindex) throws CoreException {
PDOM pdom= (PDOM) getPDOM(project);
boolean reindex= forceReindex || pdom.versionMismatch() || pdom.isEmpty();
synchronized (fIndexerMutex) {
IPDOMIndexer indexer = null;
// Look up in extension point
IExtension indexerExt = Platform.getExtensionRegistry().getExtension(CCorePlugin.INDEXER_UNIQ_ID, indexerId);
if (indexerExt != null) {
IConfigurationElement[] elements = indexerExt.getConfigurationElements();
for (int i = 0; i < elements.length; ++i) {
IConfigurationElement element = elements[i];
if ("run".equals(element.getName())) { //$NON-NLS-1$
indexer = (IPDOMIndexer)element.createExecutableExtension("class"); //$NON-NLS-1$
break;
}
private IPDOMIndexer createIndexer(ICProject project, String indexerId, boolean forceReindex) throws CoreException {
assert Thread.holdsLock(fIndexerMutex);
PDOM pdom= (PDOM) getPDOM(project);
boolean reindex= forceReindex || pdom.versionMismatch() || pdom.isEmpty();
IPDOMIndexer indexer = null;
// Look up in extension point
IExtension indexerExt = Platform.getExtensionRegistry().getExtension(CCorePlugin.INDEXER_UNIQ_ID, indexerId);
if (indexerExt != null) {
IConfigurationElement[] elements = indexerExt.getConfigurationElements();
for (int i = 0; i < elements.length; ++i) {
IConfigurationElement element = elements[i];
if ("run".equals(element.getName())) { //$NON-NLS-1$
try {
indexer = (IPDOMIndexer)element.createExecutableExtension("class"); //$NON-NLS-1$
} catch (CoreException e) {
CCorePlugin.log(e);
}
break;
}
}
if (indexer == null)
// Unknown index, default to the null one
indexer = new PDOMNullIndexer();
indexer.setProject(project);
project.getProject().setSessionProperty(indexerProperty, indexer);
registerPreferenceListener(project);
if (reindex) {
indexer.reindex();
}
return indexer;
}
// Unknown index, default to the null one
if (indexer == null)
indexer = new PDOMNullIndexer();
indexer.setProject(project);
registerPreferenceListener(project);
project.getProject().setSessionProperty(indexerProperty, indexer);
if (reindex) {
indexer.reindex();
}
return indexer;
}
public void enqueue(IPDOMIndexerTask subjob) {
@ -467,6 +494,19 @@ public class PDOMManager implements IPDOMManager, IWritableIndexManager, IListen
private void stopIndexer(IPDOMIndexer indexer) {
ICProject project= indexer.getProject();
synchronized (fIndexerMutex) {
IProject rp= project.getProject();
if (rp.isOpen()) {
try {
if (rp.getSessionProperty(indexerProperty) == indexer) {
rp.setSessionProperty(indexerProperty, null);
}
}
catch (CoreException e) {
CCorePlugin.log(e);
}
}
}
unregisterPreferenceListener(project);
synchronized (taskQueueMutex) {
if (indexerJob != null) {
@ -493,9 +533,8 @@ public class PDOMManager implements IPDOMManager, IWritableIndexManager, IListen
private void notifyState(final int state) {
if (state == IndexerStateEvent.STATE_IDLE) {
assert !Thread.holdsLock(taskQueueMutex);
synchronized(fWakeupOnIdle) {
fWakeupOnIdle.notifyAll();
synchronized(taskQueueMutex) {
taskQueueMutex.notifyAll();
}
}
@ -573,31 +612,30 @@ public class PDOMManager implements IPDOMManager, IWritableIndexManager, IListen
if (monitor.isCanceled()) {
return false;
}
boolean wouldFail= false;
boolean hasTimedOut= false;
int wait= 1000;
if (waitMaxMillis >= 0) {
int rest= (int) (limit - System.currentTimeMillis());
if (rest < wait) {
if (rest <= 0) {
wouldFail= true;
hasTimedOut= true;
}
wait= rest;
}
}
assert !Thread.holdsLock(taskQueueMutex);
synchronized(fWakeupOnIdle) {
synchronized(taskQueueMutex) {
if (isIndexerIdle()) {
return true;
}
if (wouldFail) {
if (hasTimedOut) {
return false;
}
monitor.subTask(MessageFormat.format(Messages.PDOMManager_FilesToIndexSubtask, new Object[] {new Integer(getFilesToIndexCount())}));
try {
fWakeupOnIdle.wait(wait);
taskQueueMutex.wait(wait);
} catch (InterruptedException e) {
return false;
}