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2433462
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0
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0
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2010-03-12T14:47:32.923
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2010-03-12T15:13:46.467
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2010-03-12T15:13:46.467
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205694
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205694
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760228
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2
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<p>Here is an MVar implementation specific to byte arrays (make sure to add your own package definition). From here, it is trivial to write an input stream on merged streams. I can post that too if requested.</p> <pre><code>import java.nio.ByteBuffer; public final class MVar { private static enum State { EMPTY, ONE, MANY } private final Object lock; private State state; private byte b; private ByteBuffer bytes; private int length; public MVar() { lock = new Object(); state = State.EMPTY; } public final void put(byte b) { synchronized (lock) { while (state != State.EMPTY) { try { lock.wait(); } catch (InterruptedException e) {} } this.b = b; state = State.ONE; lock.notifyAll(); } } public final void put(byte[] bytes, int offset, int length) { if (length == 0) { return; } synchronized (lock) { while (state != State.EMPTY) { try { lock.wait(); } catch (InterruptedException e) {} } this.bytes = ByteBuffer.allocateDirect(length); this.bytes.put(bytes, offset, length); this.bytes.position(0); this.length = length; state = State.MANY; lock.notifyAll(); } } public final byte take() { synchronized (lock) { while (state == State.EMPTY) { try { lock.wait(); } catch (InterruptedException e) {} } switch (state) { case ONE: { state = State.EMPTY; byte b = this.b; lock.notifyAll(); return b; } case MANY: { byte b = bytes.get(); state = --length <= 0 ? State.EMPTY : State.MANY; lock.notifyAll(); return b; } default: throw new AssertionError(); } } } public final int take(byte[] bytes, int offset, int length) { if (length == 0) { return 0; } synchronized (lock) { while (state == State.EMPTY) { try { lock.wait(); } catch (InterruptedException e) {} } switch (state) { case ONE: bytes[offset] = b; state = State.EMPTY; lock.notifyAll(); return 1; case MANY: if (this.length > length) { this.bytes.get(bytes, offset, length); this.length = this.length - length; synchronized (lock) { lock.notifyAll(); } return length; } this.bytes.get(bytes, offset, this.length); this.bytes = null; state = State.EMPTY; length = this.length; lock.notifyAll(); return length; default: throw new AssertionError(); } } } } </code></pre>
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1. POHow do you merge two input streams in Java?
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1. USScootyPuff
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1. USScootyPuff
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