co.cask.cdap.common.hooks.MetricsReporterHook.java Source code

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Here is the source code for co.cask.cdap.common.hooks.MetricsReporterHook.java

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/*
 * Copyright  2014 Cask Data, 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 co.cask.cdap.common.hooks;

import co.cask.cdap.common.metrics.MetricsCollectionService;
import co.cask.cdap.common.metrics.MetricsCollector;
import co.cask.cdap.common.metrics.MetricsScope;
import co.cask.http.AbstractHandlerHook;
import co.cask.http.HandlerInfo;
import co.cask.http.HttpResponder;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.TimeUnit;

/**
 * Records gateway requests/response metrics.
 */
public class MetricsReporterHook extends AbstractHandlerHook {
    private static final Logger LOG = LoggerFactory.getLogger(MetricsReporterHook.class);

    private final MetricsCollectionService metricsCollectionService;

    private final String serviceName;

    private final LoadingCache<String, MetricsCollector> collectorCache;

    public MetricsReporterHook(final MetricsCollectionService metricsCollectionService, String serviceName) {
        this.metricsCollectionService = metricsCollectionService;
        this.serviceName = serviceName;

        if (metricsCollectionService != null) {
            this.collectorCache = CacheBuilder.newBuilder().expireAfterAccess(1, TimeUnit.HOURS)
                    .build(new CacheLoader<String, MetricsCollector>() {
                        @Override
                        public MetricsCollector load(String key) throws Exception {
                            return metricsCollectionService.getCollector(MetricsScope.SYSTEM, key, "0");
                        }
                    });
        } else {
            collectorCache = null;
        }
    }

    @Override
    public boolean preCall(HttpRequest request, HttpResponder responder, HandlerInfo handlerInfo) {
        if (metricsCollectionService != null) {
            try {
                MetricsCollector collector = collectorCache.get(createContext(handlerInfo));
                collector.increment("request.received", 1);
            } catch (Throwable e) {
                LOG.error("Got exception while getting collector", e);
            }
        }
        return true;
    }

    @Override
    public void postCall(HttpRequest request, HttpResponseStatus status, HandlerInfo handlerInfo) {
        if (metricsCollectionService != null) {
            try {
                MetricsCollector collector = collectorCache.get(createContext(handlerInfo));
                String name;
                int code = status.getCode();
                if (code < 100) {
                    name = "unknown";
                } else if (code < 200) {
                    name = "information";
                } else if (code < 300) {
                    name = "successful";
                } else if (code < 400) {
                    name = "redirect";
                } else if (code < 500) {
                    name = "client-error";
                } else if (code < 600) {
                    name = "server-error";
                } else {
                    name = "unknown";
                }
                collector.increment("response." + name, 1, "status:" + code);
            } catch (Throwable e) {
                LOG.error("Got exception while getting collector", e);
            }
        }
    }

    private String createContext(HandlerInfo handlerInfo) {
        return String.format("%s.%s.%s", serviceName, getSimpleName(handlerInfo.getHandlerName()),
                handlerInfo.getMethodName());
    }

    private String getSimpleName(String className) {
        int ind = className.lastIndexOf('.');
        return className.substring(ind + 1);
    }
}