gov.nasa.ensemble.common.http.HttpUtils.java Source code

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Here is the source code for gov.nasa.ensemble.common.http.HttpUtils.java

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/*******************************************************************************
 * Copyright 2014 United States Government as represented by the
 * Administrator of the National Aeronautics and Space Administration.
 * All Rights Reserved.
 * 
 * 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 gov.nasa.ensemble.common.http;

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.util.EntityUtils;

public class HttpUtils {

    public static final int DFAULT_HTTP_PORT = 80;
    public static final int DFAULT_HTTPS_PORT = 443;

    public static void execute(HttpClient client, HttpRequestBase request, HttpResponseHandler handler)
            throws Exception {
        HttpResponse response = null;
        try {
            response = client.execute(request);
            if (handler != null) {
                handler.handleResponse(response);
            }
        } finally {
            HttpUtils.consume(request, response);
        }
    }

    public static <T> T execute(HttpClient client, HttpRequestBase request,
            HttpResponseHandlerWithResult<T> handler) throws Exception {
        T result = null;
        HttpResponse response = null;
        try {
            response = client.execute(request);
            if (handler != null) {
                result = handler.handleResponse(response);
            }
        } finally {
            HttpUtils.consume(request, response);
        }
        return result;
    }

    public static void consume(HttpRequestBase request, HttpResponse response) throws IOException {
        if (response != null) {
            try {
                EntityUtils.consume(response.getEntity());
            } catch (IOException e) {
                if (request != null) {
                    throw new IOException("releasing entity for " + request.getMethod(), e);
                } else {
                    throw new IOException("releasing entity", e);
                }
            }
        }
    }

    public static abstract class HttpResponseHandler {

        public abstract void handleResponse(HttpResponse response) throws Exception;

    }

    public static abstract class HttpResponseHandlerWithResult<T extends Object> {

        public abstract T handleResponse(HttpResponse response) throws Exception;

    }

}