com.google.dart.server.internal.remote.ByteRequestSink.java Source code

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Here is the source code for com.google.dart.server.internal.remote.ByteRequestSink.java

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/*
 * Copyright (c) 2014, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
 * 
 * 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.google.dart.server.internal.remote;

import com.google.common.util.concurrent.Uninterruptibles;
import com.google.gson.JsonObject;

import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;

/**
 * An {@link OutputStream} based implementation of {@link RequestSink}.
 *
 * @coverage dart.server.remote
 */
public class ByteRequestSink implements RequestSink {
    /**
     * The {@link PrintWriter} to print JSON strings to.
     */
    private final PrintWriter writer;
    /**
     * The {@link PrintStream} to print all lines to.
     */
    private DebugPrintStream debugStream;
    /**
     * The queue of lines.
     */
    private final BlockingQueue<String> lineQueue = new LinkedBlockingQueue<String>();

    /**
     * Initializes a newly created request sink.
     *
     * @param stream      the byte stream to write JSON strings to
     * @param debugStream the {@link PrintStream} to print all lines to, may be {@code null}
     */
    public ByteRequestSink(OutputStream stream, DebugPrintStream debugStream) {
        writer = new PrintWriter(new OutputStreamWriter(stream, StandardCharsets.UTF_8));
        this.debugStream = debugStream;
        new LinesWriterThread().start();
    }

    @Override
    public void add(JsonObject request) {
        String text = request.toString();
        if (debugStream != null) {
            if (!text.contains("server.getVersion")) {
                debugStream.println(System.currentTimeMillis() + " => " + text);
            }
        }
        lineQueue.add(text);
    }

    @Override
    public void close() {
        writer.close();
    }

    public void waitForFlush() {
        while (true) {
            if (lineQueue.isEmpty()) {
                return;
            }
            Uninterruptibles.sleepUninterruptibly(1, TimeUnit.MILLISECONDS);
        }
    }

    private class LinesWriterThread extends Thread {
        public LinesWriterThread() {
            setName("ByteRequestSink.LinesWriterThread");
            setDaemon(true);
        }

        @Override
        public void run() {
            while (true) {
                try {
                    String line = lineQueue.take();
                    writer.println(line);
                    writer.flush();
                } catch (InterruptedException e) {
                }
            }
        }
    }
}