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com.github.monnetproject.translation.fidel OSGi Bundle from the Monnet Project's translation.project project.

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/*********************************************************************************
 * Copyright (c) 2011, Monnet Project All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer. * Redistributions in binary
 * form must reproduce the above copyright notice, this list of conditions and
 * the following disclaimer in the documentation and/or other materials provided
 * with the distribution. * Neither the name of the Monnet Project nor the names
 * of its contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE MONNET PROJECT BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * *******************************************************************************
 */
package eu.monnetproject.translation.fidel;

/**
 * This is a bit of manual memory management as Java doesn't seem to be competent in doing it
 * by itself :(
 * 
 * @author John McCrae
 */
public class BufferCache {
    private final int N, M;
    private final int[][] bufs;
    private final Object[] locks;
    
    public BufferCache(int N, int M) {
        this.N = N;
        this.M = M;
        this.bufs = new int[N][M];
        this.locks = new Object[N];
    }
    
    public int[] lock(Object lock) {
        for(int i = 0; i < N; i++) {
            if(locks[i] == null) {
                locks[i] = lock;
                return bufs[i];
            }
        }
        throw new NoFreeLocksException();
    }
    
    public void delock(Object lock) {
        for(int i = 0; i < N; i++) {
            if(locks[i] == lock) {
                locks[i] = null;
            }
        }
    }
 
    
    public static class NoFreeLocksException extends RuntimeException {
        
    }
}