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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.tuscany.sca.binding.websocket.runtime;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.channels.SocketChannel;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.tuscany.sca.assembly.EndpointReference;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.websocket.WebSocket;
import org.apache.websocket.WebSocketConnector;
public class WebsocketReferenceInvoker implements Invoker {
// TODO add timeout mechanism for persistent connections
private static ConcurrentMap<String, WebSocket<SocketChannel>> persistentWebsockets = new ConcurrentHashMap<String, WebSocket<SocketChannel>>();
protected Operation operation;
protected EndpointReference endpoint;
public WebsocketReferenceInvoker(Operation operation, EndpointReference endpoint) {
this.operation = operation;
this.endpoint = endpoint;
}
public Message invoke(Message msg) {
try {
WebSocket<SocketChannel> websocket = initWebsocketConnection(endpoint.getBinding().getURI());
return doInvoke(msg, websocket);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private WebSocket<SocketChannel> initWebsocketConnection(String uri) throws IOException, URISyntaxException {
WebSocket<SocketChannel> websocket = null;
synchronized (persistentWebsockets) {
websocket = persistentWebsockets.get(uri);
if (websocket == null) {
WebSocketConnector connector = new WebSocketConnector();
websocket = connector.connect(new URI(uri), null, "apache-tuscany", null);
persistentWebsockets.put(uri, websocket);
}
}
return websocket;
}
public Message doInvoke(Message msg, WebSocket<SocketChannel> websocket) throws IOException {
String componentName = endpoint.getTargetEndpoint().getComponent().getName();
String serviceName = endpoint.getTargetEndpoint().getService().getName();
String operationName = operation.getName();
String uri = componentName + "/" + serviceName + "/" + operationName;
String payload = JSONUtil.encodeRequestParams((Object[]) msg.getBody());
WebSocketBindingRequest request = new WebSocketBindingRequest(UUID.randomUUID().toString(), uri, payload);
String operationResponse = invokeViaWebsocket(websocket, JSONUtil.encodeRequest(request));
WebSocketBindingResponse response = JSONUtil.decodeResponse(operationResponse);
Class<?> returnType = operation.getOutputType().getLogical().get(0).getPhysical();
Object invocationResponse = JSONUtil.decodeResponsePayload(response.getPayload(), returnType);
msg.setBody(invocationResponse);
return msg;
}
private String invokeViaWebsocket(WebSocket<SocketChannel> websocket, String request) throws IOException {
websocket.sendText(request);
return websocket.receiveText();
}
public static void shutdown() {
for (WebSocket<SocketChannel> websocket : persistentWebsockets.values()) {
try {
websocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
persistentWebsockets.clear();
}
}
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