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Plain GWT Swm erweiterungen, auch zur benutzung in mobilen Geraeten
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package de.swm.gwt.client.mobile.network;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.URL;
import com.google.gwt.jsonp.client.JsonpRequestBuilder;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.InvocationException;
import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.client.rpc.impl.RemoteServiceProxy;
import com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.ResponseReader;
import com.google.gwt.user.client.rpc.impl.RpcStatsContext;
import com.google.gwt.user.client.rpc.impl.Serializer;
import java.util.logging.Logger;
/**
* An extension of {@link RemoteServiceProxy} that uses JSONP as a transport mechanism. Makes use of
* {@link JsonpRequestBuilder} to make JSONP requests
*
* @author wiese.daniel
* copyright (C) 2011, SWM Services GmbH
*/
public class JsonpServiceProxy extends RemoteServiceProxy {
private static final Logger LOGGER = Logger.getLogger(JsonpServiceProxy.class.getName());
/**
* The request parameter for the gwt-rpc payload.
*/
public static final String RPC_PAYLOAD_PARAM = "rpcpayload";
/**
* The callback parameter for the JSONP callback.
*/
public static final String CALLBACK_PARAM = "callback";
/**
* Protected constructor of {@code JsonpServiceProxy}.
*
* @param moduleBaseURL the base URL of the module
* @param remoteServiceRelativePath the relative path to this remote service
* @param serializationPolicyName the serialization policy name
* @param serializer the serializer
*/
protected JsonpServiceProxy(String moduleBaseURL, String remoteServiceRelativePath, String serializationPolicyName,
Serializer serializer) {
super(moduleBaseURL, remoteServiceRelativePath, serializationPolicyName, serializer);
}
/**
* Wenn Ok kommt.
*
* @param encodedResponse .
* @return .
*/
static boolean isReturnValue(String encodedResponse) {
return encodedResponse.startsWith("//OK");
}
/**
* Return true if the encoded response contains a checked exception that was thrown by the method
* invocation.
*
* @param encodedResponse .
* @return true if the encoded response contains a checked exception that was thrown by the method
* invocation
*/
static boolean isThrownException(String encodedResponse) {
return encodedResponse.startsWith("//EX");
}
@Override
protected Request doInvoke(final ResponseReader responseReader, String methodName,
RpcStatsContext statsContext, String requestData, final AsyncCallback tAsyncCallback) {
try {
// create a JsonpRequestBuilder to make hte call with
JsonpRequestBuilder jprb = new JsonpRequestBuilder();
jprb.setCallbackParam(CALLBACK_PARAM);
// request an Object using the JsonpRequestBuilder using the GWT RPC
// payload
String serviceEntryPoint = getServiceEntryPoint();
//int indexOf = serviceEntryPoint.indexOf("mvgfahrplan");
//serviceEntryPoint = serviceEntryPoint.substring(indexOf, serviceEntryPoint.length());
//serviceEntryPoint = "http://mo-swm-i.intra.swm.de/mvg/" + serviceEntryPoint;
LOGGER.info("Seding RPC Request:" + serviceEntryPoint);
// serviceEntryPoint = "http://localhost:8090/mvg/" + serviceEntryPoint;
String encode = URL.encode(requestData);
//encode = encode.replace("file:///android_asset/www/", "http://mo-swm-i.intra.swm.de/mvg/");
LOGGER.info("Payload:" + encode);
jprb.requestObject(serviceEntryPoint + "?" + RPC_PAYLOAD_PARAM + "=" + encode,
new AsyncCallback() {
public void onFailure(Throwable throwable) {
LOGGER.info("RPC Fehler: " + throwable.getMessage());
tAsyncCallback
.onFailure(new InvocationException(
"Unable to initiate the asynchronous service invocation -- check the network connection"));
throwable.printStackTrace();
}
/**
* On success, the JSONP callback will send back a StringJso object, which contains one field: a
* GWT-RPC encoded string. We'll decode the GWT-RPC response and return control back to the
* onSuccess/onFailure of the {@link AsyncCallback} of the initial GWT-RPC call
*
* @param encodedResponse
*/
@SuppressWarnings("unchecked")
public void onSuccess(JsonpResponseJso encodedResponse) {
try {
// the encoded response is returned by calling
// 'getEntry()' in the StringJso. We'll clean up
// the escaping of quotes though
String rpcString = encodedResponse.getEntry().replaceAll("\\\\\"", "\"");
LOGGER.info("RCP -Success: " + rpcString);
if (isReturnValue(rpcString)) {
tAsyncCallback.onSuccess((T) responseReader.read(createStreamReader(rpcString)));
} else if (isThrownException(encodedResponse.getEntry())) {
// using createStreamReader(..).readObject();
tAsyncCallback.onFailure((Throwable) createStreamReader(rpcString).readObject());
} else {
tAsyncCallback.onFailure(new InvocationException("Unknown return value type"));
}
} catch (SerializationException e) {
tAsyncCallback.onFailure(new InvocationException("Failure deserializing object " + e));
}
}
});
} catch (Exception ex) {
InvocationException iex = new InvocationException(
"Unable to initiate the asynchronous service invocation -- check the network connection", ex);
tAsyncCallback.onFailure(iex);
} finally {
if (statsContext.isStatsAvailable()) {
statsContext.stats(statsContext.bytesStat(methodName, requestData.length(), "requestSent"));
}
}
return null;
}
/**
* Jsonp response object.
*
* @author wiese.daniel
* copyright (C) 2011, SWM Services GmbH
*/
public static class JsonpResponseJso extends JavaScriptObject {
/**
* Default constructor.
*/
protected JsonpResponseJso() {
}
/**
* Liefert den Json string vom Server.
*
* @return der Json String.
*/
public final native String getEntry() /*-{
return this.entry;
}-*/;
}
}