org.apache.avro.mapred.tether.TetherOutputService.java Source code

Introduction

Here is the source code for org.apache.avro.mapred.tether.TetherOutputService.java

Source

/**
 * 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.avro.mapred.tether;

import java.nio.ByteBuffer;

import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;

class TetherOutputService implements OutputProtocol {
    private Reporter reporter;
    private OutputCollector<TetherData, NullWritable> collector;
    private int inputPort;
    private boolean complete;
    private String error;

    public TetherOutputService(OutputCollector<TetherData, NullWritable> collector, Reporter reporter) {
        this.reporter = reporter;
        this.collector = collector;
    }

    public synchronized void configure(int inputPort) {
        TetherMapRunner.LOG.info("got input port from child");
        this.inputPort = inputPort;
        notify();
    }

    public synchronized int inputPort() throws InterruptedException {
        while (inputPort == 0) {
            TetherMapRunner.LOG.info("waiting for input port from child");
            wait();
        }
        return inputPort;
    }

    public void output(ByteBuffer datum) {
        try {
            collector.collect(new TetherData(datum), NullWritable.get());
        } catch (Throwable e) {
            TetherMapRunner.LOG.warn("Error: " + e, e);
            synchronized (this) {
                error = e.toString();
            }
        }
    }

    public void outputPartitioned(int partition, ByteBuffer datum) {
        TetherPartitioner.setNextPartition(partition);
        output(datum);
    }

    public void status(String message) {
        reporter.setStatus(message.toString());
    }

    public void count(String group, String name, long amount) {
        reporter.getCounter(group.toString(), name.toString()).increment(amount);
    }

    public synchronized void fail(String message) {
        TetherMapRunner.LOG.warn("Failing: " + message);
        error = message.toString();
        notify();
    }

    public synchronized void complete() {
        TetherMapRunner.LOG.info("got task complete");
        complete = true;
        notify();
    }

    public synchronized boolean isFinished() {
        return complete || (error != null);
    }

    public String error() {
        return error;
    }

    public synchronized boolean waitForFinish() throws InterruptedException {
        while (!isFinished())
            wait();
        return error != null;
    }

}