org.apache.ambari.log4j.hadoop.mapreduce.jobhistory.JobHistoryAppender.java Source code

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Here is the source code for org.apache.ambari.log4j.hadoop.mapreduce.jobhistory.JobHistoryAppender.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.ambari.log4j.hadoop.mapreduce.jobhistory;

import java.io.IOException;
import java.util.Queue;
import java.util.concurrent.LinkedBlockingQueue;

import org.apache.ambari.log4j.common.LogParser;
import org.apache.ambari.log4j.common.LogStore;
import org.apache.ambari.log4j.common.LoggingThreadRunnable;
import org.apache.ambari.log4j.common.store.DatabaseStore;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.tools.rumen.HistoryEvent;
import org.apache.hadoop.util.StringUtils;
import org.apache.log4j.Appender;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.LoggingEvent;

public class JobHistoryAppender extends AppenderSkeleton implements Appender {

    private static final Log LOG = LogFactory.getLog(JobHistoryAppender.class);

    private final Queue<LoggingEvent> events;
    private LoggingThreadRunnable logThreadRunnable;
    private Thread logThread;

    private final LogParser logParser;

    private final LogStore nullStore = new LogStore() {
        @Override
        public void persist(LoggingEvent originalEvent, Object parsedEvent) throws IOException {
            LOG.info(((HistoryEvent) parsedEvent).toString());
        }

        @Override
        public void close() throws IOException {
        }
    };

    private String driver;
    private String database;
    private String user;
    private String password;

    private LogStore logStore;

    public JobHistoryAppender() {
        events = new LinkedBlockingQueue<LoggingEvent>();
        logParser = new MapReduceJobHistoryParser();
        logStore = nullStore;
    }

    /* Getters & Setters for log4j */

    public String getDatabase() {
        return database;
    }

    public void setDatabase(String database) {
        this.database = database;
    }

    public String getDriver() {
        return driver;
    }

    public void setDriver(String driver) {
        this.driver = driver;
    }

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    /* --------------------------- */

    @Override
    public void activateOptions() {
        synchronized (this) {
            //if (true) { 
            if (database.equals("none")) {
                logStore = nullStore;
                LOG.info("database set to 'none'");
            } else {
                try {
                    logStore = new DatabaseStore(driver, database, user, password,
                            new MapReduceJobHistoryUpdater());
                } catch (IOException ioe) {
                    LOG.debug("Failed to connect to db " + database, ioe);
                    System.err.println("Failed to connect to db " + database + " as user " + user + " password "
                            + password + " and driver " + driver + " with " + StringUtils.stringifyException(ioe));
                    throw new RuntimeException("Failed to create database store for " + database, ioe);
                } catch (Exception e) {
                    LOG.debug("Failed to connect to db " + database, e);
                    System.err.println("Failed to connect to db " + database + " as user " + user + " password "
                            + password + " and driver " + driver + " with " + StringUtils.stringifyException(e));
                    throw new RuntimeException("Failed to create database store for " + database, e);
                }
            }
            logThreadRunnable = new LoggingThreadRunnable(events, logParser, logStore);
            logThread = new Thread(logThreadRunnable);
            logThread.setDaemon(true);
            logThread.start();

            super.activateOptions();
        }
    }

    @Override
    public void close() {
        try {
            logThreadRunnable.close();
        } catch (IOException ioe) {
            LOG.info("Failed to close logThreadRunnable", ioe);
        }
        try {
            logThread.join(1000);
        } catch (InterruptedException ie) {
            LOG.info("logThread interrupted", ie);
        }
    }

    @Override
    public boolean requiresLayout() {
        return false;
    }

    @Override
    protected void append(LoggingEvent event) {
        events.add(event);
    }
}