org.apache.hadoop.gateway.services.metrics.impl.instr.InstrHttpClientBuilderProvider.java Source code

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Here is the source code for org.apache.hadoop.gateway.services.metrics.impl.instr.InstrHttpClientBuilderProvider.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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.hadoop.gateway.services.metrics.impl.instr;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.httpclient.HttpClientMetricNameStrategy;
import com.codahale.metrics.httpclient.InstrumentedHttpClientConnectionManager;
import com.codahale.metrics.httpclient.InstrumentedHttpRequestExecutor;
import org.apache.hadoop.gateway.services.metrics.InstrumentationProvider;
import org.apache.hadoop.gateway.services.metrics.MetricsContext;
import org.apache.hadoop.gateway.services.metrics.impl.DefaultMetricsService;
import org.apache.http.Header;
import org.apache.http.HttpRequest;
import org.apache.http.RequestLine;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;

import java.net.URISyntaxException;

public class InstrHttpClientBuilderProvider implements InstrumentationProvider<HttpClientBuilder> {

    @Override
    public HttpClientBuilder getInstrumented(MetricsContext metricsContext) {
        MetricRegistry registry = (MetricRegistry) metricsContext
                .getProperty(DefaultMetricsService.METRICS_REGISTRY);
        return HttpClientBuilder.create()
                .setRequestExecutor(new InstrumentedHttpRequestExecutor(registry, TOPOLOGY_URL_AND_METHOD))
                .setConnectionManager(new PoolingHttpClientConnectionManager());
    }

    @Override
    public HttpClientBuilder getInstrumented(HttpClientBuilder instanceClass, MetricsContext metricsContext) {
        throw new UnsupportedOperationException();
    }

    private static final HttpClientMetricNameStrategy TOPOLOGY_URL_AND_METHOD = new HttpClientMetricNameStrategy() {
        public String getNameFor(String name, HttpRequest request) {
            try {
                String context = "";
                Header header = request.getFirstHeader("X-Forwarded-Context");
                if (header != null) {
                    context = header.getValue();
                }
                RequestLine requestLine = request.getRequestLine();
                URIBuilder uriBuilder = new URIBuilder(requestLine.getUri());
                return MetricRegistry.name("service", new String[] { name,
                        context + uriBuilder.removeQuery().build().toString(), methodNameString(request) });
            } catch (URISyntaxException e) {
                throw new IllegalArgumentException(e);
            }
        }

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