/*
* Copyright 2000-2016 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.server;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import com.vaadin.shared.communication.MethodInvocation;
import com.vaadin.shared.communication.ServerRpc;
public class ServerRpcMethodInvocation extends MethodInvocation {
private static final Map<String, Method> invocationMethodCache = new ConcurrentHashMap<>(
128, 0.75f, 1);
private final Method method;
private final Class<? extends ServerRpc> interfaceClass;
public ServerRpcMethodInvocation(String connectorId,
Class<? extends ServerRpc> interfaceClass, String methodName,
int parameterCount) {
super(connectorId, interfaceClass.getName(), methodName);
assert ServerRpc.class.isAssignableFrom(interfaceClass);
this.interfaceClass = interfaceClass;
method = findInvocationMethod(interfaceClass, methodName,
parameterCount);
}
public Class<? extends ServerRpc> getInterfaceClass() {
return interfaceClass;
}
public Method getMethod() {
return method;
}
/**
* Tries to find the method from the cache or alternatively by invoking
* {@link #doFindInvocationMethod(Class, String, int)} and updating the
* cache.
*
* @param targetType
* @param methodName
* @param parameterCount
* @return
*/
private Method findInvocationMethod(Class<?> targetType, String methodName,
int parameterCount) {
// TODO currently only using method name and number of parameters as the
// signature
String signature = targetType.getName() + "." + methodName + "("
+ parameterCount;
Method invocationMethod = invocationMethodCache.get(signature);
if (invocationMethod == null) {
invocationMethod = doFindInvocationMethod(targetType, methodName,
parameterCount);
if (invocationMethod != null) {
invocationMethodCache.put(signature, invocationMethod);
}
}
if (invocationMethod == null) {
throw new IllegalStateException("Can't find method " + methodName
+ " with " + parameterCount + " parameters in "
+ targetType.getName());
}
return invocationMethod;
}
/**
* Tries to find the method from the class by looping through available
* methods.
*
* @param targetType
* @param methodName
* @param parameterCount
* @return
*/
private Method doFindInvocationMethod(Class<?> targetType,
String methodName, int parameterCount) {
Method[] methods = targetType.getMethods();
for (Method method : methods) {
Class<?>[] parameterTypes = method.getParameterTypes();
if (method.getName().equals(methodName)
&& parameterTypes.length == parameterCount) {
return method;
}
}
return null;
}
}