/*
* Copyright (C) 2008 Google Inc.
*
* 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.google.greaze.webservice.client;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.logging.Logger;
import com.google.greaze.client.internal.utils.UrlParamStringBuilder;
import com.google.greaze.definition.WebServiceSystemException;
import com.google.greaze.definition.webservice.WebServiceCallSpec;
import com.google.greaze.definition.webservice.WebServiceRequest;
import com.google.greaze.definition.webservice.WebServiceResponse;
import com.google.gson.Gson;
/**
* Main class used by clients to access a Gson Web service.
*
* @author inder
*/
public class WebServiceClient {
protected final ServerConfig config;
protected static final Logger logger = Logger.getLogger(WebServiceClient.class.getName());
public WebServiceClient(ServerConfig serverConfig) {
this.config = serverConfig;
}
/** Visible for testing only */
URL getWebServiceUrl(WebServiceCallSpec callSpec, WebServiceRequest request, Gson gson) {
String baseUrl = buildBasePath(callSpec);
try {
String urlParamString = new UrlParamStringBuilder(gson)
.add(request.getUrlParameters())
.build();
return new URL(baseUrl + urlParamString);
} catch (MalformedURLException e) {
throw new WebServiceSystemException(e);
}
}
protected String buildBasePath(WebServiceCallSpec callSpec) {
StringBuilder url = new StringBuilder(config.getServiceBaseUrl());
if (callSpec.hasVersion()) {
url.append('/').append(callSpec.getVersion());
}
url.append(callSpec.getPath().getServicePath());
return url.toString();
}
public WebServiceResponse getResponse(
WebServiceCallSpec callSpec, WebServiceRequest request, Gson gson) {
HttpURLConnection conn = null;
try {
URL webServiceUrl = getWebServiceUrl(callSpec, request, gson);
conn = openConnection(webServiceUrl);
RequestSender requestSender = new RequestSender(gson);
requestSender.send(conn, request);
ResponseReceiver responseReceiver = new ResponseReceiver(gson, callSpec.getResponseSpec());
return responseReceiver.receive(conn);
} catch (NullPointerException e) {
throw new WebServiceSystemException(e);
} catch (IllegalArgumentException e) {
throw new WebServiceSystemException(e);
} finally {
closeIgnoringErrors(conn);
}
}
protected HttpURLConnection openConnection(URL url) {
try {
return (HttpURLConnection) url.openConnection();
} catch (IOException e) {
throw new WebServiceSystemException(e);
}
}
@Override
public String toString() {
return String.format("config:%s", config);
}
protected static void closeIgnoringErrors(HttpURLConnection conn) {
if (conn != null) {
conn.disconnect();
}
}
}