org.apache.hama.bsp.GroomServerStatus.java Source code

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Here is the source code for org.apache.hama.bsp.GroomServerStatus.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.hama.bsp;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableFactories;
import org.apache.hadoop.io.WritableFactory;

/**
 * A GroomServerStatus is a BSP primitive. Keeps info on a BSPMaster. The
 * BSPMaster maintains a set of the most recent GroomServerStatus objects for
 * each unique GroomServer it knows about.
 */
public class GroomServerStatus implements Writable {
    public static final Log LOG = LogFactory.getLog(GroomServerStatus.class);

    static {
        WritableFactories.setFactory(GroomServerStatus.class, new WritableFactory() {
            @Override
            public Writable newInstance() {
                return new GroomServerStatus();
            }
        });
    }

    String groomName;
    String rpcServer;
    String hostName;
    int failures;
    List<TaskStatus> taskReports;

    volatile long lastSeen;
    private int maxTasks;

    public GroomServerStatus() {
        // taskReports = new ArrayList<TaskStatus>();
        taskReports = new CopyOnWriteArrayList<TaskStatus>();
    }

    public GroomServerStatus(String groomName, List<TaskStatus> taskReports, int failures, int maxTasks) {
        this(groomName, taskReports, failures, maxTasks, "", "");
    }

    public GroomServerStatus(String groomName, List<TaskStatus> taskReports, int failures, int maxTasks, String rpc,
            String hostName) {
        this.groomName = groomName;
        this.taskReports = new ArrayList<TaskStatus>(taskReports);
        this.failures = failures;
        this.maxTasks = maxTasks;
        this.rpcServer = rpc;
        this.hostName = hostName;
    }

    public String getGroomName() {
        return groomName;
    }

    public String getGroomHostName() {
        return hostName;
    }

    public String getRpcServer() {
        return rpcServer;
    }

    /**
     * Get the current tasks at the GroomServer. Tasks are tracked by a
     * {@link TaskStatus} object.
     * 
     * @return a list of {@link TaskStatus} representing the current tasks at the
     *         GroomServer.
     */
    public List<TaskStatus> getTaskReports() {
        return taskReports;
    }

    public int getFailures() {
        return failures;
    }

    public long getLastSeen() {
        return lastSeen;
    }

    public void setLastSeen(long lastSeen) {
        this.lastSeen = lastSeen;
    }

    public int getMaxTasks() {
        return maxTasks;
    }

    /**
     * Return the current BSP Task count
     */
    public int countTasks() {
        int taskCount = 0;
        for (TaskStatus ts : taskReports) {
            TaskStatus.State state = ts.getRunState();
            if (state == TaskStatus.State.RUNNING || state == TaskStatus.State.UNASSIGNED) {
                taskCount++;
            }
        }

        return taskCount;
    }

    /**
     * For BSPMaster to distinguish between different GroomServers, because
     * BSPMaster stores using GroomServerStatus as key.
     */
    @Override
    public int hashCode() {
        int result = 17;
        result = 37 * result + groomName.hashCode();
        result = 37 * result + rpcServer.hashCode();
        result = 37 * result + hostName.hashCode();
        /*
         * result = 37*result + (int)failures; result = 37*result +
         * taskReports.hashCode(); result = 37*result +
         * (int)(lastSeen^(lastSeen>>>32)); result = 37*result + (int)maxTasks;
         */
        return result;
    }

    @Override
    public boolean equals(Object o) {
        if (o == this)
            return true;
        if (null == o)
            return false;
        if (getClass() != o.getClass())
            return false;

        GroomServerStatus s = (GroomServerStatus) o;
        if (!s.groomName.equals(groomName))
            return false;
        if (!s.rpcServer.equals(rpcServer))
            return false;
        /*
         * if(s.failures != failures) return false; if(null == s.taskReports){
         * if(null != s.taskReports) return false; }else
         * if(!s.taskReports.equals(taskReports)){ return false; } if(s.lastSeen !=
         * lastSeen) return false; if(s.maxTasks != maxTasks) return false;
         */
        return true;
    }

    /*
     * (non-Javadoc)
     * @see org.apache.hadoop.io.Writable#readFields(java.io.DataInput)
     */
    @Override
    public void readFields(DataInput in) throws IOException {
        this.groomName = Text.readString(in);
        this.rpcServer = Text.readString(in);
        this.hostName = Text.readString(in);

        this.failures = in.readInt();
        this.maxTasks = in.readInt();
        taskReports.clear();
        int numTasks = in.readInt();

        TaskStatus status;
        for (int i = 0; i < numTasks; i++) {
            status = new TaskStatus();
            status.readFields(in);
            taskReports.add(status);
        }
    }

    /*
     * (non-Javadoc)
     * @see org.apache.hadoop.io.Writable#write(java.io.DataOutput)
     */
    @Override
    public void write(DataOutput out) throws IOException {
        Text.writeString(out, groomName);
        Text.writeString(out, rpcServer);
        Text.writeString(out, hostName);

        out.writeInt(failures);
        out.writeInt(maxTasks);
        out.writeInt(taskReports.size());
        for (TaskStatus taskStatus : taskReports) {
            taskStatus.write(out);
        }
    }

    public Iterator<TaskStatus> taskReports() {
        return taskReports.iterator();
    }
}