| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| package org.apache.nutch.webui.client.impl; |
| |
| import static com.google.common.base.Preconditions.checkState; |
| |
| import java.lang.invoke.MethodHandles; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.commons.lang3.exception.ExceptionUtils; |
| import org.apache.nutch.webui.client.NutchClient; |
| import org.apache.nutch.webui.client.model.JobInfo; |
| import org.apache.nutch.webui.client.model.JobInfo.State; |
| import org.joda.time.DateTimeConstants; |
| import org.joda.time.Duration; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * This class executes remote job and waits for success/failure result |
| * |
| * @author feodor |
| * |
| */ |
| public class RemoteCommandExecutor { |
| private static final Logger LOG = LoggerFactory |
| .getLogger(MethodHandles.lookup().lookupClass()); |
| |
| private static final int DEFAULT_TIMEOUT_SEC = 60; |
| private Duration requestDelay = new Duration(500); |
| |
| private NutchClient client; |
| private ExecutorService executor; |
| |
| public RemoteCommandExecutor(NutchClient client) { |
| this.client = client; |
| this.executor = Executors.newSingleThreadExecutor(); |
| } |
| |
| public JobInfo executeRemoteJob(RemoteCommand command) { |
| try { |
| String jobId = client.executeJob(command.getJobConfig()); |
| Future<JobInfo> chekerFuture = executor |
| .submit(new JobStateChecker(jobId)); |
| return chekerFuture.get(getTimeout(command), TimeUnit.MILLISECONDS); |
| } catch (Exception e) { |
| LOG.error("Remote command failed", e); |
| JobInfo jobInfo = new JobInfo(); |
| jobInfo.setState(State.FAILED); |
| jobInfo.setMsg(ExceptionUtils.getStackTrace(e)); |
| return jobInfo; |
| } |
| } |
| |
| private long getTimeout(RemoteCommand command) { |
| if (command.getTimeout() == null) { |
| return DEFAULT_TIMEOUT_SEC * DateTimeConstants.MILLIS_PER_SECOND; |
| } |
| return command.getTimeout().getMillis(); |
| } |
| |
| public void setRequestDelay(Duration requestDelay) { |
| this.requestDelay = requestDelay; |
| } |
| |
| public class JobStateChecker implements Callable<JobInfo> { |
| |
| private String jobId; |
| |
| public JobStateChecker(String jobId) { |
| this.jobId = jobId; |
| } |
| |
| @Override |
| public JobInfo call() throws Exception { |
| while (!Thread.interrupted()) { |
| JobInfo jobInfo = client.getJobInfo(jobId); |
| checkState(jobInfo != null, "Cannot get job info!"); |
| |
| State state = jobInfo.getState(); |
| checkState(state != null, "Unknown job state!"); |
| |
| if (state == State.RUNNING || state == State.ANY || state == State.IDLE) { |
| Thread.sleep(requestDelay.getMillis()); |
| continue; |
| } |
| |
| return jobInfo; |
| } |
| return null; |
| } |
| |
| } |
| } |