at.ac.tuwien.big.testsuite.impl.util.HttpClientProducer.java Source code

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Here is the source code for at.ac.tuwien.big.testsuite.impl.util.HttpClientProducer.java

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/*
 * Copyright 2013 BIG TU Wien.
 *
 * 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 at.ac.tuwien.big.testsuite.impl.util;

import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.ConnectException;
import java.net.UnknownHostException;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;
import javax.net.ssl.SSLException;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpRequest;
import org.apache.http.client.HttpClient;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.impl.client.DecompressingHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.PoolingClientConnectionManager;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpContext;

/**
 *
 * @author Christian, Florian Zoubek
 */
public class HttpClientProducer {

    private static final int MAX_RETRY_COUNT = 10;

    @Produces
    @ApplicationScoped
    HttpClient produceHttpClient() {
        PoolingClientConnectionManager cm = new PoolingClientConnectionManager();
        cm.setMaxTotal(100);
        cm.setDefaultMaxPerRoute(20);
        DefaultHttpClient client = new DefaultHttpClient(cm);

        client.setHttpRequestRetryHandler(new HttpRequestRetryHandler() {
            @Override
            public boolean retryRequest(IOException exception, int executionCount, HttpContext context) {
                if (executionCount >= MAX_RETRY_COUNT) {
                    // Do not retry if over max retry count
                    return false;
                }
                if (exception instanceof InterruptedIOException) {
                    // Timeout
                    return true;
                }
                if (exception instanceof UnknownHostException) {
                    // Unknown host
                    return true;
                }
                if (exception instanceof ConnectException) {
                    // Connection refused
                    return true;
                }
                if (exception instanceof SSLException) {
                    // SSL handshake exception
                    return true;
                }
                HttpRequest request = (HttpRequest) context.getAttribute(ExecutionContext.HTTP_REQUEST);
                boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);
                if (idempotent) {
                    // Retry if the request is considered idempotent 
                    return true;
                }
                return false;
            }
        });

        return new DecompressingHttpClient(client);
    }

    void disposeHttpClient(@Disposes HttpClient httpClient) {
        httpClient.getConnectionManager().shutdown();
    }
}