java/io/PipedInputStreamTest.java

/*
 *  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 tests.api.java.io;

import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;

public class PipedInputStreamTest extends junit.framework.TestCase {

	static class PWriter implements Runnable {
		PipedOutputStream pos;

		public byte bytes[];

		public void run() {
			try {
				pos.write(bytes);
				synchronized (this) {
					notify();
				}
			} catch (IOException e) {
				e.printStackTrace(System.out);
				System.out.println("Could not write bytes");
			}
		}

		public PWriter(PipedOutputStream pout, int nbytes) {
			pos = pout;
			bytes = new byte[nbytes];
			for (int i = 0; i < bytes.length; i++)
				bytes[i] = (byte) (System.currentTimeMillis() % 9);
		}
	}

	Thread t;

	PWriter pw;

	PipedInputStream pis;

	PipedOutputStream pos;

	/**
	 * @tests java.io.PipedInputStream#PipedInputStream()
	 */
	public void test_Constructor() {
		// Test for method java.io.PipedInputStream()
		// Used in tests
	}

	/**
	 * @tests java.io.PipedInputStream#PipedInputStream(java.io.PipedOutputStream)
	 */
	public void test_ConstructorLjava_io_PipedOutputStream() throws Exception {
        // Test for method java.io.PipedInputStream(java.io.PipedOutputStream)
        pis = new PipedInputStream(new PipedOutputStream());
        pis.available();
    }

	/**
	 * @tests java.io.PipedInputStream#available()
	 */
	public void test_available() throws Exception {
        // Test for method int java.io.PipedInputStream.available()
        pis = new PipedInputStream();
        pos = new PipedOutputStream();

        pis.connect(pos);
        t = new Thread(pw = new PWriter(pos, 1000));
        t.start();

        synchronized (pw) {
            pw.wait(10000);
        }
        assertTrue("Available returned incorrect number of bytes: "
                + pis.available(), pis.available() == 1000);

        PipedInputStream pin = new PipedInputStream();
        PipedOutputStream pout = new PipedOutputStream(pin);
        // We know the PipedInputStream buffer size is 1024.
        // Writing another byte would cause the write to wait
        // for a read before returning
        for (int i = 0; i < 1024; i++)
            pout.write(i);
        assertEquals("Incorrect available count", 1024 , pin.available());
    }

	/**
	 * @tests java.io.PipedInputStream#close()
	 */
	public void test_close() throws IOException {
		// Test for method void java.io.PipedInputStream.close()
		pis = new PipedInputStream();
		pos = new PipedOutputStream();
        pis.connect(pos);
        pis.close();
		try {
			pos.write((byte) 127);
            fail("Failed to throw expected exception");
		} catch (IOException e) {
			// The spec for PipedInput saya an exception should be thrown if
			// a write is attempted to a closed input. The PipedOuput spec
			// indicates that an exception should be thrown only when the
			// piped input thread is terminated without closing
			return;
		}
	}

	/**
	 * @tests java.io.PipedInputStream#connect(java.io.PipedOutputStream)
	 */
	public void test_connectLjava_io_PipedOutputStream() throws Exception {
        // Test for method void
        // java.io.PipedInputStream.connect(java.io.PipedOutputStream)
        pis = new PipedInputStream();
        pos = new PipedOutputStream();
        assertEquals("Non-conected pipe returned non-zero available bytes", 0,
                pis.available());

        pis.connect(pos);
        t = new Thread(pw = new PWriter(pos, 1000));
        t.start();

        synchronized (pw) {
            pw.wait(10000);
        }
        assertEquals("Available returned incorrect number of bytes", 1000, pis
                .available());
    }

	/**
	 * @tests java.io.PipedInputStream#read()
	 */
	public void test_read() throws Exception {
        // Test for method int java.io.PipedInputStream.read()
        pis = new PipedInputStream();
        pos = new PipedOutputStream();

        pis.connect(pos);
        t = new Thread(pw = new PWriter(pos, 1000));
        t.start();

        synchronized (pw) {
            pw.wait(10000);
        }
        assertEquals("Available returned incorrect number of bytes", 1000, pis
                .available());
        assertEquals("read returned incorrect byte", pw.bytes[0], (byte) pis
                .read());
    }

	/**
	 * @tests java.io.PipedInputStream#read(byte[], int, int)
	 */
	public void test_read$BII() throws Exception {
        // Test for method int java.io.PipedInputStream.read(byte [], int, int)
        pis = new PipedInputStream();
        pos = new PipedOutputStream();

        pis.connect(pos);
        t = new Thread(pw = new PWriter(pos, 1000));
        t.start();

        byte[] buf = new byte[400];
        synchronized (pw) {
            pw.wait(10000);
        }
        assertTrue("Available returned incorrect number of bytes: "
                + pis.available(), pis.available() == 1000);
        pis.read(buf, 0, 400);
        for (int i = 0; i < 400; i++) {
            assertEquals("read returned incorrect byte[]", pw.bytes[i], buf[i]);
        }
    }

    /**
     * @tests java.io.PipedInputStream#read(byte[], int, int)
     * Regression for HARMONY-387
     */
    public void test_read$BII_2() throws IOException {
        PipedInputStream obj = new PipedInputStream();
        try {
            obj.read(new byte[0], 0, -1);
            fail("IndexOutOfBoundsException expected");
        } catch (IndexOutOfBoundsException t) {
            assertEquals(
                    "IndexOutOfBoundsException rather than a subclass expected",
                    IndexOutOfBoundsException.class, t.getClass());
        }
    }

    /**
     * @tests java.io.PipedInputStream#read(byte[], int, int)
     */
    public void test_read$BII_3() throws IOException {
        PipedInputStream obj = new PipedInputStream();
        try {
            obj.read(new byte[0], -1, 0);
            fail("IndexOutOfBoundsException expected");
        } catch (ArrayIndexOutOfBoundsException t) {
            fail("IndexOutOfBoundsException expected");
        } catch (IndexOutOfBoundsException t) {
        }
    }

    /**
     * @tests java.io.PipedInputStream#read(byte[], int, int)
     */
    public void test_read$BII_4() throws IOException {
        PipedInputStream obj = new PipedInputStream();
        try {
            obj.read(new byte[0], -1, -1);
            fail("IndexOutOfBoundsException expected");
        } catch (ArrayIndexOutOfBoundsException t) {
            fail("IndexOutOfBoundsException expected");
        } catch (IndexOutOfBoundsException t) {
        }
    }

    /**
     * @tests java.io.PipedInputStream#receive(int)
     */
    public void test_receive() throws IOException {
        pis = new PipedInputStream();
        pos = new PipedOutputStream();

        // test if writer recognizes dead reader
        pis.connect(pos);
        class WriteRunnable implements Runnable {

            boolean pass = false;

            boolean readerAlive = true;

            public void run() {
                try {
                    pos.write(1);
                    while (readerAlive)
                        ;
                    try {
                        // should throw exception since reader thread
                        // is now dead
                        pos.write(1);
                    } catch (IOException e) {
                        pass = true;
                    }
                } catch (IOException e) {}
            }
        }
        WriteRunnable writeRunnable = new WriteRunnable();
        Thread writeThread = new Thread(writeRunnable);
        class ReadRunnable implements Runnable {

            boolean pass;

            public void run() {
                try {
                    int one = pis.read();
                    pass = true;
                } catch (IOException e) {}
            }
        }
        ;
        ReadRunnable readRunnable = new ReadRunnable();
        Thread readThread = new Thread(readRunnable);
        writeThread.start();
        readThread.start();
        while (readThread.isAlive())
            ;
        writeRunnable.readerAlive = false;
        assertTrue("reader thread failed to read", readRunnable.pass);
        while (writeThread.isAlive())
            ;
        assertTrue("writer thread failed to recognize dead reader",
                writeRunnable.pass);

        // attempt to write to stream after writer closed
        pis = new PipedInputStream();
        pos = new PipedOutputStream();

        pis.connect(pos);
        class MyRunnable implements Runnable {

            boolean pass;

            public void run() {
                try {
                    pos.write(1);
                } catch (IOException e) {
                    pass = true;
                }
            }
        }
        MyRunnable myRun = new MyRunnable();
        synchronized (pis) {
            t = new Thread(myRun);
            // thread t will be blocked inside pos.write(1)
            // when it tries to call the synchronized method pis.receive
            // because we hold the monitor for object pis
            t.start();
            try {
                // wait for thread t to get to the call to pis.receive
                Thread.sleep(100);
            } catch (InterruptedException e) {}
            // now we close
            pos.close();
        }
        // we have exited the synchronized block, so now thread t will make
        // a call to pis.receive AFTER the output stream was closed,
        // in which case an IOException should be thrown
        while (t.isAlive()) {
            ;
        }
        assertTrue(
                "write failed to throw IOException on closed PipedOutputStream",
                myRun.pass);
    }

	/**
	 * Tears down the fixture, for example, close a network connection. This
	 * method is called after a test is executed.
	 */
	protected void tearDown() throws Exception {
		try {
			if (t != null) {
				t.interrupt();
            }
		} catch (Exception ignore) {
		}
        super.tearDown();
	}
}