Java example source code file (WriterLoop.java)

This example Java source code file (WriterLoop.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

exception, pipedinputstream, pipedoutputstream, thread, throwable, writerloop

The WriterLoop.java Java example source code

/*
 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/**
 * @test
 * @bug  6219755
 * @summary Write end loops infinitely when the
 *          buffer is full and the read end has closed.
 */

import java.io.*;

public class WriterLoop extends Thread {

    static PipedOutputStream out;
    static PipedInputStream  in;

    public void run() {
        try {
            System.out.println("Writer started.");

            // without the fix, this test will hang at this point,
            // i.e inside the call to write()
            out.write(new byte[64*1024]);
        } catch (Throwable e) {

            // with the fix an IOException is caught
            System.out.println("Writer exception:");
            e.printStackTrace();
        } finally {
            System.out.println("Writer done.");
        }
    }

    public static void main(String args[]) throws Exception {
        in = new PipedInputStream();
        out = new PipedOutputStream(in);
        WriterLoop writer = new WriterLoop();
        writer.start();

        try {
            System.out.println("Reader reading...");
            in.read(new byte[2048]);

            System.out.println("Reader closing stream...");
            in.close();

            System.out.println("Reader sleeping 3 seconds...");
            Thread.sleep(3000);
        } catch (Throwable e) {
            System.out.println("Reader exception:");
            e.printStackTrace();
        } finally {
            System.out.println("Active threads:");
            Thread[] threads = new Thread[Thread.activeCount()];
            Thread.enumerate(threads);
            for (int i = 0; i < threads.length; i++) {
                System.out.println("  " + threads[i]);
            }
            System.out.println("Waiting for writer...");
            writer.join();
            System.out.println("Done.");
        }
    }
}