| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.cdt.internal.core.search.indexing; |
| |
| import java.io.IOException; |
| |
| import org.eclipse.cdt.internal.core.search.processing.IJob; |
| import org.eclipse.core.runtime.IPath; |
| import org.eclipse.cdt.internal.core.index.IIndex; |
| |
| public abstract class IndexRequest implements IJob { |
| protected boolean isCancelled = false; |
| protected IPath indexPath; |
| protected IndexManager manager; |
| |
| public IndexRequest(IPath indexPath, IndexManager manager) { |
| this.indexPath = indexPath; |
| this.manager = manager; |
| } |
| |
| public boolean belongsTo(String projectName) { |
| return projectName.equals(this.indexPath.segment(0)); |
| } |
| |
| public void cancel() { |
| this.manager.jobWasCancelled(this.indexPath); |
| this.isCancelled = true; |
| } |
| |
| public boolean isReadyToRun() { |
| // tag the index as inconsistent |
| this.manager.aboutToUpdateIndex(indexPath, updatedIndexState()); |
| return true; |
| } |
| /* |
| * This code is assumed to be invoked while monitor has read lock |
| */ |
| protected void saveIfNecessary(IIndex index, ReadWriteMonitor monitor) throws IOException { |
| /* if index has changed, commit these before querying */ |
| if (index.hasChanged()) { |
| try { |
| monitor.exitRead(); // free read lock |
| monitor.enterWrite(); // ask permission to write |
| this.manager.saveIndex(index); |
| } finally { |
| monitor.exitWriteEnterRead(); // finished writing and reacquire read permission |
| } |
| } |
| } |
| |
| protected Integer updatedIndexState() { |
| return IndexManager.UPDATING_STATE; |
| } |
| } |