WaitableShort.java

/*
  File: WaitableShort.java

  Originally written by Doug Lea and released into the public domain.
  This may be used for any purposes whatsoever without acknowledgment.
  Thanks for the assistance and support of Sun Microsystems Labs,
  and everyone contributing, testing, and using this code.

  History:
  Date       Who                What
  23Jun1998  dl               Create public version
  13may2004  dl               Add notifying bit ops
*/

package com.alipay.zdal.datasource.resource.util.concurrent;

/**
 * A class useful for offloading waiting and signalling operations
 * on single short variables. 
 * <p>
 * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
 **/

public class WaitableShort extends SynchronizedShort {
    /** 
     * Make a new WaitableShort with the given initial value,
     * and using its own internal lock.
     **/
    public WaitableShort(short initialValue) {
        super(initialValue);
    }

    /** 
     * Make a new WaitableShort with the given initial value,
     * and using the supplied lock.
     **/
    public WaitableShort(short initialValue, Object lock) {
        super(initialValue, lock);
    }

    @Override
    public short set(short newValue) {
        synchronized (lock_) {
            lock_.notifyAll();
            return super.set(newValue);
        }
    }

    @Override
    public boolean commit(short assumedValue, short newValue) {
        synchronized (lock_) {
            boolean success = super.commit(assumedValue, newValue);
            if (success)
                lock_.notifyAll();
            return success;
        }
    }

    @Override
    public short increment() {
        synchronized (lock_) {
            lock_.notifyAll();
            return super.increment();
        }
    }

    @Override
    public short decrement() {
        synchronized (lock_) {
            lock_.notifyAll();
            return super.decrement();
        }
    }

    @Override
    public short add(short amount) {
        synchronized (lock_) {
            lock_.notifyAll();
            return super.add(amount);
        }
    }

    @Override
    public short subtract(short amount) {
        synchronized (lock_) {
            lock_.notifyAll();
            return super.subtract(amount);
        }
    }

    @Override
    public short multiply(short factor) {
        synchronized (lock_) {
            lock_.notifyAll();
            return super.multiply(factor);
        }
    }

    @Override
    public short divide(short factor) {
        synchronized (lock_) {
            lock_.notifyAll();
            return super.divide(factor);
        }
    }

    /** 
     * Set the value to its complement
     * @return the new value 
     **/
    @Override
    public short complement() {
        synchronized (lock_) {
            value_ = (short) (~value_);
            lock_.notifyAll();
            return value_;
        }
    }

    /** 
     * Set value to value & b.
     * @return the new value 
     **/
    @Override
    public short and(short b) {
        synchronized (lock_) {
            value_ = (short) (value_ & b);
            lock_.notifyAll();
            return value_;
        }
    }

    /** 
     * Set value to value | b.
     * @return the new value 
     **/
    @Override
    public short or(short b) {
        synchronized (lock_) {
            value_ = (short) (value_ | b);
            lock_.notifyAll();
            return value_;
        }
    }

    /** 
     * Set value to value ^ b.
     * @return the new value 
     **/
    @Override
    public short xor(short b) {
        synchronized (lock_) {
            value_ = (short) (value_ ^ b);
            lock_.notifyAll();
            return value_;
        }
    }

    /**
     * Wait until value equals c, then run action if nonnull.
     * The action is run with the synchronization lock held.
     **/

    public void whenEqual(short c, Runnable action) throws InterruptedException {
        synchronized (lock_) {
            while (!(value_ == c))
                lock_.wait();
            if (action != null)
                action.run();
        }
    }

    /**
     * wait until value not equal to c, then run action if nonnull.
     * The action is run with the synchronization lock held.
     **/
    public void whenNotEqual(short c, Runnable action) throws InterruptedException {
        synchronized (lock_) {
            while (!(value_ != c))
                lock_.wait();
            if (action != null)
                action.run();
        }
    }

    /**
     * wait until value less than or equal to c, then run action if nonnull.
     * The action is run with the synchronization lock held.
     **/
    public void whenLessEqual(short c, Runnable action) throws InterruptedException {
        synchronized (lock_) {
            while (!(value_ <= c))
                lock_.wait();
            if (action != null)
                action.run();
        }
    }

    /**
     * wait until value less than c, then run action if nonnull.
     * The action is run with the synchronization lock held.
     **/
    public void whenLess(short c, Runnable action) throws InterruptedException {
        synchronized (lock_) {
            while (!(value_ < c))
                lock_.wait();
            if (action != null)
                action.run();
        }
    }

    /**
     * wait until value greater than or equal to c, then run action if nonnull.
     * The action is run with the synchronization lock held.
     **/
    public void whenGreaterEqual(short c, Runnable action) throws InterruptedException {
        synchronized (lock_) {
            while (!(value_ >= c))
                lock_.wait();
            if (action != null)
                action.run();
        }
    }

    /**
     * wait until value greater than c, then run action if nonnull.
     * The action is run with the synchronization lock held.
     **/
    public void whenGreater(short c, Runnable action) throws InterruptedException {
        synchronized (lock_) {
            while (!(value_ > c))
                lock_.wait();
            if (action != null)
                action.run();
        }
    }

}