jsst.core.client.dispatcher.impl.HTTPDispatcher.java Source code

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Here is the source code for jsst.core.client.dispatcher.impl.HTTPDispatcher.java

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/*
 * Copyright 2010 the original author or authors.
 *
 * Licensed under the GNU Lesser General Public License, Version 3.0 (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.gnu.org/licenses/lgpl-3.0.html
 *
 * 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 jsst.core.client.dispatcher.impl;

import jsst.core.client.dispatcher.Dispatcher;
import jsst.core.client.dispatcher.DispatcherException;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;

import java.io.IOException;
import java.lang.reflect.Method;
import java.net.ConnectException;

/**
 * @author stanley.shyiko@gmail.com
 * @version Oct 3, 2010
 */
public class HTTPDispatcher implements Dispatcher<HTTPServerResponse> {

    public static final String REQUEST_PARAM_CLASS_NAME = "className";
    public static final String REQUEST_PARAM_METHOD_NAME = "methodName";

    private String url;

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

    @Override
    public HTTPServerResponse dispatch(Method method) throws DispatcherException {
        HttpClient httpClient = new HttpClient();
        PostMethod postMethod = new PostMethod(url);
        postMethod.setParameter(REQUEST_PARAM_CLASS_NAME, method.getDeclaringClass().getCanonicalName());
        postMethod.setParameter(REQUEST_PARAM_METHOD_NAME, method.getName());
        try {
            try {
                httpClient.executeMethod(postMethod);
            } catch (ConnectException ex) {
                throw new DispatcherException("Failed to connect to \"" + url + "\". Seems like server is down");
            }
            return new HTTPServerResponse(url, postMethod.getResponseBodyAsString(), postMethod.getStatusCode());
        } catch (IOException e) {
            throw new DispatcherException("Exception caught while sending request to \"" + url + "\"", e);
        } finally {
            postMethod.releaseConnection();
        }
    }
}