org.apache.nutch.webui.client.impl.CrawlingCycle.java Source code

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Here is the source code for org.apache.nutch.webui.client.impl.CrawlingCycle.java

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/**
 * 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 java.lang.invoke.MethodHandles;
import java.util.List;

import org.apache.commons.collections4.CollectionUtils;
import org.apache.nutch.webui.client.model.Crawl;
import org.apache.nutch.webui.client.model.JobInfo;
import org.apache.nutch.webui.client.model.JobInfo.State;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.Lists;

/**
 * This class implements crawl cycle as in crawl script
 * 
 * @author feodor
 * 
 */
public class CrawlingCycle {
    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

    private CrawlingCycleListener listener;
    private RemoteCommandExecutor executor;
    private Crawl crawl;

    private List<RemoteCommand> remoteCommands;
    private List<RemoteCommand> executedCommands = Lists.newArrayList();

    public CrawlingCycle(CrawlingCycleListener listener, RemoteCommandExecutor executor, Crawl crawl,
            List<RemoteCommand> commands) {
        this.listener = listener;
        this.executor = executor;
        this.crawl = crawl;
        this.remoteCommands = commands;
    }

    public synchronized void executeCrawlCycle() {
        listener.crawlingStarted(crawl);

        for (RemoteCommand command : remoteCommands) {
            JobInfo jobInfo = executor.executeRemoteJob(command);
            command.setJobInfo(jobInfo);

            LOG.info("Executed remote command data: {}", command);

            if (jobInfo.getState() == State.FAILED) {
                listener.onCrawlError(crawl, jobInfo.getMsg());
                return;
            }

            executedCommands.add(command);
            listener.commandExecuted(crawl, command, calculateProgress());
        }
        listener.crawlingFinished(crawl);
    }

    private int calculateProgress() {
        if (CollectionUtils.isEmpty(remoteCommands)) {
            return 0;
        }
        return (int) ((float) executedCommands.size() / (float) remoteCommands.size() * 100);
    }

}