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/*
* Copyright 2000-2013 Vaadin Ltd.
*
* 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.vaadin.client.communication;
import java.util.Collection;
import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONString;
import com.vaadin.client.ApplicationConnection;
import com.vaadin.client.ConnectorMap;
import com.vaadin.client.ServerConnector;
import com.vaadin.client.VConsole;
import com.vaadin.client.metadata.Method;
import com.vaadin.client.metadata.NoDataException;
import com.vaadin.client.metadata.Type;
import com.vaadin.shared.communication.ClientRpc;
import com.vaadin.shared.communication.MethodInvocation;
/**
* Client side RPC manager that can invoke methods based on RPC calls received
* from the server.
*
* A GWT generator is used to create an implementation of this class at
* run-time.
*
* @since 7.0
*/
public class RpcManager {
/**
* Perform server to client RPC invocation.
*
* @param invocation
* method to invoke
*/
public void applyInvocation(MethodInvocation invocation,
ServerConnector connector) {
Method method = getMethod(invocation);
Collection<ClientRpc> implementations = connector
.getRpcImplementations(invocation.getInterfaceName());
try {
for (ClientRpc clientRpc : implementations) {
method.invoke(clientRpc, invocation.getParameters());
}
} catch (NoDataException e) {
throw new IllegalStateException("There is no information about "
+ method.getSignature()
+ ". Did you remember to compile the right widgetset?", e);
}
}
private Method getMethod(MethodInvocation invocation) {
Type type = new Type(invocation.getInterfaceName(), null);
Method method = type.getMethod(invocation.getMethodName());
return method;
}
private static String getSignature(MethodInvocation invocation) {
return invocation.getInterfaceName() + "." + invocation.getMethodName();
}
public Type[] getParameterTypes(MethodInvocation invocation) {
Method method = getMethod(invocation);
try {
Type[] parameterTypes = method.getParameterTypes();
return parameterTypes;
} catch (NoDataException e) {
throw new IllegalStateException("There is no information about "
+ method.getSignature()
+ ". Did you remember to compile the right widgetset?", e);
}
}
public void parseAndApplyInvocation(JSONArray rpcCall,
ApplicationConnection connection) {
ConnectorMap connectorMap = ConnectorMap.get(connection);
String connectorId = ((JSONString) rpcCall.get(0)).stringValue();
String interfaceName = ((JSONString) rpcCall.get(1)).stringValue();
String methodName = ((JSONString) rpcCall.get(2)).stringValue();
JSONArray parametersJson = (JSONArray) rpcCall.get(3);
ServerConnector connector = connectorMap.getConnector(connectorId);
MethodInvocation invocation = new MethodInvocation(connectorId,
interfaceName, methodName);
if (connector instanceof HasJavaScriptConnectorHelper) {
((HasJavaScriptConnectorHelper) connector)
.getJavascriptConnectorHelper().invokeJsRpc(invocation,
parametersJson);
} else {
if (connector == null) {
throw new IllegalStateException("Target connector ("
+ connector + ") not found for RCC to "
+ getSignature(invocation));
}
parseMethodParameters(invocation, parametersJson, connection);
VConsole.log("Server to client RPC call: " + invocation);
applyInvocation(invocation, connector);
}
}
private void parseMethodParameters(MethodInvocation methodInvocation,
JSONArray parametersJson, ApplicationConnection connection) {
Type[] parameterTypes = getParameterTypes(methodInvocation);
Object[] parameters = new Object[parametersJson.size()];
for (int j = 0; j < parametersJson.size(); ++j) {
parameters[j] = JsonDecoder.decodeValue(parameterTypes[j],
parametersJson.get(j), null, connection);
}
methodInvocation.setParameters(parameters);
}
}
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