Example usage for org.eclipse.jdt.internal.core.search.indexing ReadWriteMonitor exitReadEnterWrite

Introduction

In this page you can find the example usage for org.eclipse.jdt.internal.core.search.indexing ReadWriteMonitor exitReadEnterWrite.

Prototype

public synchronized boolean exitReadEnterWrite() 

Source Link

Document

Atomic exitRead/enterWrite: Allows to keep monitor in between exit read and next enter write.

Usage

From source file:com.codenvy.ide.ext.java.server.internal.core.search.indexing.IndexManager.java

License:Open Source License

/**
 * Commit all index memory changes to disk
 *//* w ww . j  a  v a 2  s.  c om*/
public void saveIndexes() {
    // only save cached indexes... the rest were not modified
    ArrayList toSave = new ArrayList();
    synchronized (this) {
        Object[] valueTable = this.indexes.valueTable;
        for (int i = 0, l = valueTable.length; i < l; i++) {
            Index index = (Index) valueTable[i];
            if (index != null)
                toSave.add(index);
        }
    }

    boolean allSaved = true;
    for (int i = 0, length = toSave.size(); i < length; i++) {
        Index index = (Index) toSave.get(i);
        ReadWriteMonitor monitor = index.monitor;
        if (monitor == null)
            continue; // index got deleted since acquired
        try {
            // take read lock before checking if index has changed
            // don't take write lock yet since it can cause a deadlock (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=50571)
            monitor.enterRead();
            if (index.hasChanged()) {
                if (monitor.exitReadEnterWrite()) {
                    try {
                        saveIndex(index);
                    } catch (IOException e) {
                        if (VERBOSE) {
                            Util.verbose("-> got the following exception while saving:", System.err); //$NON-NLS-1$
                            e.printStackTrace();
                        }
                        allSaved = false;
                    } finally {
                        monitor.exitWriteEnterRead();
                    }
                } else {
                    allSaved = false;
                }
            }
        } finally {
            monitor.exitRead();
        }
    }
    if (this.participantsContainers != null && this.participantUpdated) {
        writeParticipantsIndexNamesFile();
        this.participantUpdated = false;
    }
    this.needToSave = !allSaved;
}

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