001/*
002 * (C) Copyright 2017 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 */
017package org.nuxeo.ecm.core.management.standby;
018
019import javax.management.JMException;
020import org.nuxeo.ecm.core.api.NuxeoException;
021import org.nuxeo.runtime.api.Framework;
022import org.nuxeo.runtime.management.ServerLocator;
023import org.nuxeo.runtime.model.ComponentContext;
024import org.nuxeo.runtime.model.DefaultComponent;
025import org.nuxeo.runtime.trackers.concurrent.ThreadEventHandler;
026import org.nuxeo.runtime.trackers.concurrent.ThreadEventListener;
027
028import com.codahale.metrics.Counter;
029import com.codahale.metrics.Meter;
030import com.codahale.metrics.MetricRegistry;
031import com.codahale.metrics.Timer;
032import com.codahale.metrics.Timer.Context;
033
034/**
035 * @since 9.2
036 */
037public class StandbyComponent extends DefaultComponent {
038
039    protected final StandbyCommand command = new StandbyCommand();
040
041    protected final Counter active = Framework.getService(MetricRegistry.class)
042            .counter(MetricRegistry.name(StandbyComponent.class, "active"));
043
044    protected final Meter meter = Framework.getService(MetricRegistry.class)
045            .meter(MetricRegistry.name(StandbyComponent.class, "meter"));
046
047    protected final Timer timer = Framework.getService(MetricRegistry.class)
048            .timer(MetricRegistry.name(StandbyComponent.class, "timer"));
049
050    protected final ThreadLocal<Context> holder = new ThreadLocal<>();
051
052    protected final ThreadEventListener threadsListener = new ThreadEventListener(new ThreadEventHandler() {
053
054        @Override
055        public void onEnter(boolean isLongRunning) {
056            if (isLongRunning) {
057                return;
058            }
059            holder.set(timer.time());
060            meter.mark();
061            active.inc();
062        }
063
064        @Override
065        public void onLeave() {
066            active.dec();
067            holder.get().close();
068        }
069
070    });
071
072    @Override
073    public void activate(ComponentContext context) {
074        threadsListener.install();
075        try {
076            command.registration.with(Framework.getService(ServerLocator.class).lookupServer()).register();
077        } catch (JMException cause) {
078            throw new NuxeoException("Cannot register standby command", cause);
079        }
080    }
081
082    @Override
083    public void deactivate(ComponentContext context) {
084        threadsListener.uninstall();
085        try {
086            command.registration.unregister();
087        } catch (JMException cause) {
088            throw new NuxeoException("Cannot unregister standby command", cause);
089        }
090    }
091
092}