org.apache.solr.util.stats.InstrumentedHttpRequestExecutor.java Source code

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Here is the source code for org.apache.solr.util.stats.InstrumentedHttpRequestExecutor.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.solr.util.stats;

import java.io.IOException;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Timer;
import org.apache.http.HttpClientConnection;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.RequestLine;
import org.apache.http.client.methods.HttpRequestWrapper;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpRequestExecutor;
import org.apache.solr.metrics.SolrMetricManager;
import org.apache.solr.metrics.SolrMetricProducer;

import static org.apache.solr.metrics.SolrMetricManager.mkName;

/**
 * Sub-class of HttpRequestExecutor which tracks metrics interesting to solr
 * Inspired and partially copied from dropwizard httpclient library
 */
public class InstrumentedHttpRequestExecutor extends HttpRequestExecutor implements SolrMetricProducer {
    public static final HttpClientMetricNameStrategy QUERYLESS_URL_AND_METHOD = (scope, request) -> {
        try {
            final RequestLine requestLine = request.getRequestLine();
            String schemeHostPort = null;
            if (request instanceof HttpRequestWrapper) {
                HttpRequestWrapper wrapper = (HttpRequestWrapper) request;
                if (wrapper.getTarget() != null) {
                    schemeHostPort = wrapper.getTarget().getSchemeName() + "://" + wrapper.getTarget().getHostName()
                            + ":" + wrapper.getTarget().getPort();
                }
            }
            final URIBuilder url = new URIBuilder(requestLine.getUri());
            return mkName((schemeHostPort != null ? schemeHostPort : "") + url.removeQuery().build().toString()
                    + "." + methodNameString(request), scope);
        } catch (URISyntaxException e) {
            throw new IllegalArgumentException(e);
        }
    };

    public static final HttpClientMetricNameStrategy METHOD_ONLY = (scope,
            request) -> mkName(methodNameString(request), scope);

    public static final HttpClientMetricNameStrategy HOST_AND_METHOD = (scope, request) -> {
        try {
            final RequestLine requestLine = request.getRequestLine();
            String schemeHostPort = null;
            if (request instanceof HttpRequestWrapper) {
                HttpRequestWrapper wrapper = (HttpRequestWrapper) request;
                if (wrapper.getTarget() != null) {
                    schemeHostPort = wrapper.getTarget().getSchemeName() + "://" + wrapper.getTarget().getHostName()
                            + ":" + wrapper.getTarget().getPort();
                }
            }
            final URIBuilder url = new URIBuilder(requestLine.getUri());
            return mkName((schemeHostPort != null ? schemeHostPort : "") + "." + methodNameString(request), scope);
        } catch (URISyntaxException e) {
            throw new IllegalArgumentException(e);
        }
    };

    public static final Map<String, HttpClientMetricNameStrategy> KNOWN_METRIC_NAME_STRATEGIES = new HashMap<>(3);

    static {
        KNOWN_METRIC_NAME_STRATEGIES.put("queryLessURLAndMethod", QUERYLESS_URL_AND_METHOD);
        KNOWN_METRIC_NAME_STRATEGIES.put("hostAndMethod", HOST_AND_METHOD);
        KNOWN_METRIC_NAME_STRATEGIES.put("methodOnly", METHOD_ONLY);
    }

    protected MetricRegistry metricsRegistry;
    protected SolrMetricManager metricManager;
    protected String registryName;
    protected String scope;
    protected HttpClientMetricNameStrategy nameStrategy;

    public InstrumentedHttpRequestExecutor(int waitForContinue, HttpClientMetricNameStrategy nameStrategy) {
        super(waitForContinue);
        this.nameStrategy = nameStrategy;
    }

    public InstrumentedHttpRequestExecutor(HttpClientMetricNameStrategy nameStrategy) {
        this.nameStrategy = nameStrategy;
    }

    private static String methodNameString(HttpRequest request) {
        return request.getRequestLine().getMethod().toLowerCase(Locale.ROOT) + ".requests";
    }

    @Override
    public HttpResponse execute(HttpRequest request, HttpClientConnection conn, HttpContext context)
            throws IOException, HttpException {
        Timer.Context timerContext = null;
        if (metricsRegistry != null) {
            timerContext = timer(request).time();
        }
        try {
            return super.execute(request, conn, context);
        } finally {
            if (timerContext != null) {
                timerContext.stop();
            }
        }
    }

    private Timer timer(HttpRequest request) {
        return metricsRegistry.timer(nameStrategy.getNameFor(scope, request));
    }

    @Override
    public void initializeMetrics(SolrMetricManager manager, String registry, String tag, String scope) {
        this.metricManager = manager;
        this.registryName = registry;
        this.metricsRegistry = manager.registry(registry);
        this.scope = scope;
    }
}