ch.rasc.wampspring.testsupport.CompletableFutureWebSocketHandler.java Source code

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Here is the source code for ch.rasc.wampspring.testsupport.CompletableFutureWebSocketHandler.java

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/**
 * Copyright 2014-2015 Ralph Schaer <ralphschaer@gmail.com>
 *
 * 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 ch.rasc.wampspring.testsupport;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.AbstractWebSocketHandler;

import ch.rasc.wampspring.message.WampMessage;
import ch.rasc.wampspring.message.WelcomeMessage;

import com.fasterxml.jackson.core.JsonFactory;

public class CompletableFutureWebSocketHandler extends AbstractWebSocketHandler {

    private final CompletableFuture<WelcomeMessage> welcomeMessageFuture;
    private CompletableFuture<List<WampMessage>> messageFuture;

    private final JsonFactory jsonFactory;

    private int noOfResults;

    private final int timeout;

    private List<WampMessage> receivedMessages;

    public CompletableFutureWebSocketHandler(JsonFactory jsonFactory) {
        this(1, jsonFactory);
    }

    public CompletableFutureWebSocketHandler(int expectedNoOfResults, JsonFactory jsonFactory) {
        this.jsonFactory = jsonFactory;
        this.timeout = getTimeoutValue();
        this.welcomeMessageFuture = new CompletableFuture<>();
        this.reset(expectedNoOfResults);
    }

    private static int getTimeoutValue() {
        int timeout = 2;
        try {
            String timeoutValue = System.getenv("WS_TIMEOUT");
            timeout = Integer.parseInt(timeoutValue);
        } catch (Exception e) {
            // ignore error
        }
        return timeout;
    }

    public void reset() {
        reset(1);
    }

    public void reset(int expectedNoOfResults) {
        this.noOfResults = expectedNoOfResults;
        this.messageFuture = new CompletableFuture<>();
        this.receivedMessages = new ArrayList<>();
    }

    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {

        try {
            WampMessage wampMessage = WampMessage.fromJson(this.jsonFactory, message.getPayload());

            if (wampMessage instanceof WelcomeMessage) {
                this.welcomeMessageFuture.complete((WelcomeMessage) wampMessage);
            } else {
                this.receivedMessages.add(wampMessage);
                if (this.receivedMessages.size() == this.noOfResults) {
                    this.messageFuture.complete(this.receivedMessages);
                }

            }

        } catch (IOException e) {
            this.welcomeMessageFuture.completeExceptionally(e);
            this.messageFuture.completeExceptionally(e);
        }
    }

    public WampMessage getWampMessage() throws InterruptedException, ExecutionException, TimeoutException {
        List<WampMessage> results = this.messageFuture.get(this.timeout, TimeUnit.SECONDS);
        return results.get(0);
    }

    public List<WampMessage> getWampMessages() throws InterruptedException, ExecutionException, TimeoutException {
        return this.messageFuture.get(this.timeout, TimeUnit.SECONDS);
    }

    public WelcomeMessage getWelcomeMessage() throws InterruptedException, ExecutionException, TimeoutException {
        return this.welcomeMessageFuture.get(this.timeout, TimeUnit.SECONDS);
    }
}