com.appenginefan.toolkit.common.HttpClientEnvironment.java Source code

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Here is the source code for com.appenginefan.toolkit.common.HttpClientEnvironment.java

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/*
 * Copyright (c) 2009 Jens Scheffler (appenginefan.com)
 * 
 * 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 com.appenginefan.toolkit.common;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.PostMethod;

/**
 * Environment for http-based communication that uses an apache http client
 * 
 * @author Jens Scheffler
 *
 */
public class HttpClientEnvironment implements WebConnectionClient.Environment {

    private static final Logger LOG = Logger.getLogger(HttpClientEnvironment.class.getName());

    private final HttpClient client = new HttpClient();
    private final String url;

    public HttpClientEnvironment(String url) {
        this.url = url;
    }

    @Override
    public long currentTimeMillis() {
        return System.currentTimeMillis();
    }

    @Override
    public void execute(final WebConnectionClient client) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    client.run();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }

    @Override
    public void sleep(long millis) throws InterruptedException {
        if (millis > 0) {
            Thread.sleep(millis);
        }
    }

    @Override
    public String fetch(String data) {
        LOG.fine("sending " + data);
        PostMethod method = new PostMethod(url);
        method.setRequestBody(data);
        try {
            int returnCode = client.executeMethod(method);
            if (returnCode == HttpStatus.SC_OK) {
                String response = method.getResponseBodyAsString();
                LOG.fine("receiving " + response);
                return response;
            } else {
                LOG.log(Level.WARNING, "Communication failed, status code " + returnCode);
            }
        } catch (HttpException e) {
            LOG.log(Level.WARNING, "Communication failed ", e);
        } catch (IOException e) {
            LOG.log(Level.WARNING, "Communication failed ", e);
        } finally {
            method.releaseConnection();
        }
        return null;
    }

}