Examples of java.io.PipedWriter

java.io.PipedWriter
PipedWriter is a class which places information on a communications pipe. When two threads want to pass data back and forth, one creates a piped writer and the other creates a piped reader. @see PipedReader

    /**
     * @tests java.io.PipedWriter#write(int)
     */
    public void test_write_I_MultiThread() throws IOException {
        final PipedReader pr = new PipedReader();
        final PipedWriter pw = new PipedWriter();
        // test if writer recognizes dead reader
        pr.connect(pw);


        class WriteRunnable implements Runnable {
            boolean pass = false;
            volatile boolean readerAlive = true;
            public void run() {
                try {
                    pw.write(1);
                    while (readerAlive) {
                    // wait the reader thread dead
                    }
                    try {
                        // should throw exception since reader thread
                        // is now dead
                        pw.write(1);
                    } catch (IOException e) {
                        pass = true;
                    }
                } catch (IOException e) {
                  //ignore

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    /**
     * @tests java.io.PipedWriter#write(char[],int,int)
     */
    public void test_write_$CII_MultiThread() throws Exception {
        final PipedReader pr = new PipedReader();
        final PipedWriter pw = new PipedWriter();


        // test if writer recognizes dead reader
        pr.connect(pw);


        class WriteRunnable implements Runnable {
            boolean pass = false;


            volatile boolean readerAlive = true;


            public void run() {
                try {
                    pw.write(1);
                    while (readerAlive) {
                    // wait the reader thread dead
                    }
                    try {
                        // should throw exception since reader thread
                        // is now dead
                        char[] buf = new char[10];
                        pw.write(buf, 0, 10);
                    } catch (IOException e) {
                        pass = true;
                    }
                } catch (IOException e) {
                  //ignore

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     * @tests java.io.PipedWriter#write(int)
     */
    public void test_writeI() throws Exception {
        // Test for method void java.io.PipedWriter.write(int)


        pw = new PipedWriter();
        rdrThread = new Thread(reader = new PReader(pw), "writeI");
        rdrThread.start();
        pw.write(1);
        pw.write(2);
        pw.write(3);

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    public void test_ConstructorLjava_io_PipedReader() throws Exception {
        // Test for method java.io.PipedWriter(java.io.PipedReader)
        char[] buf = new char[10];
        "HelloWorld".getChars(0, 10, buf, 0);
        PipedReader rd = new PipedReader();
        pw = new PipedWriter(rd);
        rdrThread = new Thread(reader = new PReader(rd), "Constructor(Reader)");
        rdrThread.start();
        pw.write(buf);
        pw.close();
        rdrThread.join(500);

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    public void test_close() throws Exception {
        // Test for method void java.io.PipedWriter.close()
        char[] buf = new char[10];
        "HelloWorld".getChars(0, 10, buf, 0);
        PipedReader rd = new PipedReader();
        pw = new PipedWriter(rd);
        reader = new PReader(rd);
        pw.close();
        try {
            pw.write(buf);
            fail("Should have thrown exception when attempting to write to closed writer.");

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    public void test_connectLjava_io_PipedReader() throws Exception {
        // Test for method void java.io.PipedWriter.connect(java.io.PipedReader)
        char[] buf = new char[10];
        "HelloWorld".getChars(0, 10, buf, 0);
        PipedReader rd = new PipedReader();
        pw = new PipedWriter();
        pw.connect(rd);
        rdrThread = new Thread(reader = new PReader(rd), "connect");
        rdrThread.start();
        pw.write(buf);
        pw.close();

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     */
    public void test_flush() throws Exception {
        // Test for method void java.io.PipedWriter.flush()
        char[] buf = new char[10];
        "HelloWorld".getChars(0, 10, buf, 0);
        pw = new PipedWriter();
        rdrThread = new Thread(reader = new PReader(pw), "flush");
        rdrThread.start();
        pw.write(buf);
        pw.flush();
        rdrThread.join(700);

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     */
    public void test_write$CII() throws Exception {
        // Test for method void java.io.PipedWriter.write(char [], int, int)
        char[] buf = new char[10];
        "HelloWorld".getChars(0, 10, buf, 0);
        pw = new PipedWriter();
        rdrThread = new Thread(reader = new PReader(pw), "writeCII");
        rdrThread.start();
        pw.write(buf, 0, 10);
        pw.close();
        rdrThread.join(1000);

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     * @tests java.io.PipedWriter#write(char[], int, int) Regression for
     *        HARMONY-387
     */
    public void test_write$CII_2() throws IOException {
        PipedReader pr = new PipedReader();
        PipedWriter obj = null;
        try {
            obj = new java.io.PipedWriter(pr);
            obj.write(new char[0], (int) 0, (int) -1);
            fail("IndexOutOfBoundsException expected");
        } catch (IndexOutOfBoundsException t) {
            assertEquals(
                    "IndexOutOfBoundsException rather than a subclass expected",
                    IndexOutOfBoundsException.class, t.getClass());

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    /**
     * @tests java.io.PipedWriter#write(char[], int, int)
     */
    public void test_write$CII_3() throws IOException {
        PipedReader pr = new PipedReader();
        PipedWriter obj = null;
        try {
            obj = new java.io.PipedWriter(pr);
            obj.write(new char[0], (int) -1, (int) 0);
            fail("IndexOutOfBoundsException expected");
        } catch (ArrayIndexOutOfBoundsException t) {
            fail("IndexOutOfBoundsException expected");
        } catch (IndexOutOfBoundsException t) {}
    }

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