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- /*
- * Copyright 2000-2018 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 java.util.logging.Logger;
-
- import com.vaadin.client.ApplicationConnection;
- import com.vaadin.client.ConnectorMap;
- import com.vaadin.client.ServerConnector;
- 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;
-
- import elemental.json.JsonArray;
-
- /**
- * 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);
- }
- }
-
- /**
- * Gets the method that an invocation targets.
- *
- * @param invocation
- * the method invocation to get the method for
- *
- * @since 7.4
- * @return the method targeted by this invocation
- */
- public static Method getMethod(MethodInvocation invocation) {
- // Implemented here instead of in MethodInovcation since it's in shared
- // and can't use our Method class.
- 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 MethodInvocation parseAndApplyInvocation(JsonArray rpcCall,
- ApplicationConnection connection) {
- ConnectorMap connectorMap = ConnectorMap.get(connection);
-
- String connectorId = rpcCall.getString(0);
- String interfaceName = rpcCall.getString(1);
- String methodName = rpcCall.getString(2);
- JsonArray parametersJson = rpcCall.getArray(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);
- getLogger().info("Server to client RPC call: " + invocation);
- applyInvocation(invocation, connector);
- }
-
- return invocation;
- }
-
- private void parseMethodParameters(MethodInvocation methodInvocation,
- JsonArray parametersJson, ApplicationConnection connection) {
- Type[] parameterTypes = getParameterTypes(methodInvocation);
-
- Object[] parameters = new Object[parametersJson.length()];
- for (int j = 0; j < parametersJson.length(); ++j) {
- parameters[j] = JsonDecoder.decodeValue(parameterTypes[j],
- parametersJson.get(j), null, connection);
- }
-
- methodInvocation.setParameters(parameters);
- }
-
- private static Logger getLogger() {
- return Logger.getLogger(RpcManager.class.getName());
- }
- }
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