| /*************************************************************************** |
| * Copyright (c) 2004 - 2008 Eike Stepper, Germany. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Simon McDuff - initial API and implementation |
| **************************************************************************/ |
| package org.eclipse.emf.internal.cdo.query; |
| |
| import org.eclipse.emf.cdo.CDOView; |
| import org.eclipse.emf.cdo.common.query.CDOQueryInfo; |
| import org.eclipse.emf.cdo.internal.common.query.AbstractQueryResult; |
| |
| import org.eclipse.emf.internal.cdo.CDOSessionImpl; |
| import org.eclipse.emf.internal.cdo.protocol.QueryCancelRequest; |
| |
| import org.eclipse.net4j.util.concurrent.ConcurrentValue; |
| |
| import java.util.List; |
| |
| /** |
| * @author Simon McDuff |
| */ |
| public abstract class CDOAbstractQueryIteratorImpl<T> extends AbstractQueryResult<T> |
| { |
| private static final int UNDEFINED_QUERY_ID = -1; |
| |
| private ConcurrentValue<Boolean> queryIDSet = new ConcurrentValue<Boolean>(false); |
| |
| public CDOAbstractQueryIteratorImpl(CDOView view, CDOQueryInfo queryInfo) |
| { |
| super(view, queryInfo, UNDEFINED_QUERY_ID); |
| } |
| |
| @Override |
| public void setQueryID(int queryID) |
| { |
| super.setQueryID(queryID); |
| queryIDSet.set(true); |
| } |
| |
| public void waitForInitialization() throws InterruptedException |
| { |
| queryIDSet.acquire(new Object() |
| { |
| @Override |
| public boolean equals(Object obj) |
| { |
| return Boolean.TRUE.equals(obj) || isClosed(); |
| } |
| }); |
| } |
| |
| @Override |
| public CDOView getView() |
| { |
| return (CDOView)super.getView(); |
| } |
| |
| @Override |
| public void remove() |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void close() |
| { |
| if (!isClosed()) |
| { |
| super.close(); |
| queryIDSet.reevaluate(); |
| |
| try |
| { |
| CDOSessionImpl session = (CDOSessionImpl)getView().getSession(); |
| QueryCancelRequest request = new QueryCancelRequest(session.getProtocol(), getQueryID()); |
| session.getFailOverStrategy().send(request); |
| } |
| catch (Exception ignore) |
| { |
| // Catch all exception |
| } |
| } |
| } |
| |
| public abstract List<T> asList(); |
| } |