dropship.agent.statsd.Snitch.java Source code

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Here is the source code for dropship.agent.statsd.Snitch.java

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/*
 * Copyright (C) 2014 zulily, Inc.
 *
 * Licensed 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 dropship.agent.statsd;

import com.google.common.base.Throwables;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.common.util.concurrent.Service;
import com.google.common.util.concurrent.ServiceManager;

import javax.inject.Inject;
import javax.inject.Singleton;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * The Snitch runs multiple services which watch system resources
 * and report metrics to an optional statsd server.
 */
@Singleton
class Snitch {

    private final ServiceManager snitches;

    @Inject
    Snitch(List<SnitchService> snitches) {
        this.snitches = new ServiceManager(snitches);

        this.snitches.addListener(new ServiceManager.Listener() {
            @Override
            public void healthy() {
            }

            @Override
            public void stopped() {
            }

            @Override
            public void failure(Service service) {
                System.err.format("StatsdAgent service failed: %s, cause: %s", service,
                        Throwables.getStackTraceAsString(service.failureCause()));
            }
        }, MoreExecutors.sameThreadExecutor());
    }

    /**
     * Starts all registered snitch services asynchronously.
     */
    void start() {
        snitches.startAsync();
    }

    void stop() {
        try {
            snitches.stopAsync().awaitStopped(5, TimeUnit.SECONDS);
        } catch (TimeoutException e) {
            // bury
        }
    }
}