Java tutorial
/* * @(#)$Id$ * * Copyright 2006-2008 Makoto YUI * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * Contributors: * Makoto YUI - initial implementation */ package gridool.mapred.db; import gridool.GridException; import gridool.GridJobFuture; import gridool.GridKernel; import gridool.annotation.GridKernelResource; import java.util.concurrent.ExecutionException; import org.apache.commons.logging.LogFactory; /** * * <DIV lang="en"></DIV> * <DIV lang="ja"></DIV> * * @author Makoto YUI (yuin405@gmail.com) */ public final class DBMapReduceJob extends DBMapJob { private static final long serialVersionUID = -8756855076582206285L; @GridKernelResource private transient GridKernel kernel; public DBMapReduceJob() { } @Override public boolean injectResources() { return true; } @Override public String reduce() throws GridException { final GridJobFuture<String> result = kernel.execute(DBReduceJob.class, jobConf); try { return result.get(); } catch (InterruptedException ie) { LogFactory.getLog(getClass()).error(ie.getMessage(), ie); throw new GridException(ie); } catch (ExecutionException ee) { LogFactory.getLog(getClass()).error(ee.getMessage(), ee); throw new GridException(ee); } } }