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- /*
- * 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> INVOCATION_METHOD_CACHE = 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 = INVOCATION_METHOD_CACHE.get(signature);
-
- if (invocationMethod == null) {
- invocationMethod = doFindInvocationMethod(targetType, methodName,
- parameterCount);
-
- if (invocationMethod != null) {
- INVOCATION_METHOD_CACHE.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;
- }
-
- }
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