001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *      http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.oozie.service;
019
020import org.apache.oozie.util.Instrumentation;
021import org.apache.oozie.util.MetricsInstrumentation;
022
023
024/**
025 * This service provides an {@link Instrumentation} instance mostly compatible with the original Instrumentation, but backed by
026 * Codahale Metrics. <p/> This service depends on the {@link SchedulerService}. <p/> The {@link #CONF_LOGGING_INTERVAL}
027 * configuration property indicates how often snapshots of the instrumentation should be logged.
028 */
029public class MetricsInstrumentationService extends InstrumentationService {
030
031    private static boolean isEnabled = false;
032
033    /**
034     * Initialize the metrics instrumentation service.
035     *
036     * @param services services instance.
037     * @throws org.apache.oozie.service.ServiceException
038     */
039    @Override
040    public void init(Services services) throws ServiceException {
041        final MetricsInstrumentation instr = new MetricsInstrumentation();
042        int interval = services.getConf().getInt(CONF_LOGGING_INTERVAL, 60);
043        initLogging(services, instr, interval);
044        instrumentation = instr;
045        isEnabled = true;
046    }
047
048    /**
049     * Destroy the metrics instrumentation service.
050     */
051    @Override
052    public void destroy() {
053        isEnabled = false;
054        instrumentation = null;
055    }
056
057    /**
058     * Returns if the MetricsInstrumentationService is enabled or not.
059     *
060     * @return true if the MetricsInstrumentationService is enabled; false if not
061     */
062    public static boolean isEnabled() {
063        return isEnabled;
064    }
065}