RingBufferFields( EventFactory<E> eventFactory, Sequencer sequencer) { this.sequencer = sequencer; this.bufferSize = sequencer.getBufferSize(); if (bufferSize < 1) { throw new IllegalArgumentException("bufferSize must not be less than 1"); } if (Integer.bitCount(bufferSize) != 1) { throw new IllegalArgumentException("bufferSize must be a power of 2"); } this.indexMask = bufferSize - 1; this.entries = new Object[sequencer.getBufferSize() + 2 * BUFFER_PAD]; fill(eventFactory); }
/** * Construct a RingBuffer with the full option set. * * @param eventFactory to newInstance entries for filling the RingBuffer * @param sequencer sequencer to handle the ordering of events moving through the RingBuffer. * @throws IllegalArgumentException if bufferSize is less than 1 or not a power of 2 */ public RingBuffer(EventFactory<E> eventFactory, Sequencer sequencer) { this.sequencer = sequencer; this.bufferSize = sequencer.getBufferSize(); if (bufferSize < 1) { throw new IllegalArgumentException("bufferSize must not be less than 1"); } if (Integer.bitCount(bufferSize) != 1) { throw new IllegalArgumentException("bufferSize must be a power of 2"); } this.indexMask = bufferSize - 1; this.entries = new Object[sequencer.getBufferSize()]; fill(eventFactory); }
@Test public void shouldHoldUpPublisherWhenBufferIsFull() throws InterruptedException { sequencer.addGatingSequences(gatingSequence); long sequence = sequencer.next(BUFFER_SIZE); sequencer.publish(sequence - (BUFFER_SIZE - 1), sequence); final CountDownLatch waitingLatch = new CountDownLatch(1); final CountDownLatch doneLatch = new CountDownLatch(1); final long expectedFullSequence = Sequencer.INITIAL_CURSOR_VALUE + sequencer.getBufferSize(); assertThat(sequencer.getCursor(), is(expectedFullSequence)); executor.submit( new Runnable() { @Override public void run() { waitingLatch.countDown(); long next = sequencer.next(); sequencer.publish(next); doneLatch.countDown(); } }); waitingLatch.await(); assertThat(sequencer.getCursor(), is(expectedFullSequence)); gatingSequence.set(Sequencer.INITIAL_CURSOR_VALUE + 1L); doneLatch.await(); assertThat(sequencer.getCursor(), is(expectedFullSequence + 1L)); }
RingBufferFields( EventFactory<E> eventFactory, Sequencer sequencer) { this.sequencer = sequencer; this.bufferSize = sequencer.getBufferSize(); if (bufferSize < 1) { throw new IllegalArgumentException("bufferSize must not be less than 1"); } if (Integer.bitCount(bufferSize) != 1) { throw new IllegalArgumentException("bufferSize must be a power of 2"); } this.indexMask = bufferSize - 1; this.entries = new Object[sequencer.getBufferSize() + 2 * BUFFER_PAD]; fill(eventFactory); }
RingBufferFields(EventFactory<E> eventFactory, Sequencer sequencer) { this.sequencer = sequencer; this.bufferSize = sequencer.getBufferSize(); if (bufferSize < 1) { throw new IllegalArgumentException("bufferSize must not be less than 1"); } if (Integer.bitCount(bufferSize) != 1) { throw new IllegalArgumentException("bufferSize must be a power of 2"); } this.indexMask = bufferSize - 1; this.entries = new Object[sequencer.getBufferSize() + 2 * BUFFER_PAD]; fill(eventFactory); }
RingBufferFields( EventFactory<E> eventFactory, Sequencer sequencer) { this.sequencer = sequencer; this.bufferSize = sequencer.getBufferSize(); if (bufferSize < 1) { throw new IllegalArgumentException("bufferSize must not be less than 1"); } if (Integer.bitCount(bufferSize) != 1) { throw new IllegalArgumentException("bufferSize must be a power of 2"); } this.indexMask = bufferSize - 1; this.entries = new Object[sequencer.getBufferSize() + 2 * BUFFER_PAD]; fill(eventFactory); }
RingBufferFields( EventFactory<E> eventFactory, Sequencer sequencer) { this.sequencer = sequencer; this.bufferSize = sequencer.getBufferSize(); if (bufferSize < 1) { throw new IllegalArgumentException("bufferSize must not be less than 1"); } if (Integer.bitCount(bufferSize) != 1) { throw new IllegalArgumentException("bufferSize must be a power of 2"); } this.indexMask = bufferSize - 1; this.entries = new Object[sequencer.getBufferSize() + 2 * BUFFER_PAD]; fill(eventFactory); }