/**
* Tests wait() and notify() when buffer is empty.
*/
public function testInputWhenBufferIsEmpty()
{
// Initializes a piped input stream.
$input = new PipedInputStream();
// Initializes a consumer that reads 1 byte.
$consumer = new Consumer($input, 1);
// When started, it will wait because the buffer is empty.
$consumer->start();
$this->assertEquals(0, $input->available());
// Adds contents to the buffer and notify the thread.
$input->synchronized(function () {
$buffer = $this->buffer;
$buffer[] = '*';
$buffer[] = '*';
$this->notify();
});
// Waits till the thread has finished its job.
$consumer->join();
$this->assertEquals(1, $input->available());
// Asserts the thread is not waiting.
$this->assertFalse($input->isRunning());
}
/**
* Writes data to a piped output stream, when the buffer of its downstream
* is full.
*
* The producer thread is blocked first. This can be confirmed by checking
* the 'waiting' status of the downstream object.
*
* To wake up the producer thread, a byte is shifted out of the buffer and
* the downstream is notified.
*
* Finally, check the 'waiting' status again to confirm the producer thread
* has completed its job.
*/
public function testOutputWhenBufferIsFull()
{
// Initializes a piped input stream.
$downstream = new PipedInputStream();
// Initializes buffer and fills it up with '*'.
$buffer = $downstream->buffer;
for ($i = 0; $i < PipedInputStream::BUFFER_SIZE; $i++) {
$buffer[] = '*';
}
$data = '*';
// Initializes a piped output stream.
$output = new PipedOutputStream($downstream);
// Initializes a producer.
$producer = new Producer($output, $data);
// Starts the producer. Because buffer is full, the thread will wait.
$producer->start();
// Shifts one byte off the buffer and notify the thread.
$downstream->synchronized(function () {
$buffer = $this->buffer;
$buffer->shift();
$this->notify();
});
// Waits for the thread to finish its job.
$producer->join();
$this->assertTrue(true);
// Now asserts the thread is not waiting.
$this->assertFalse($downstream->isRunning());
}