Java ByteBuffer Set releaseTemporaryDirectBuffer(ByteBuffer buf)

Description

release Temporary Direct Buffer

License

Open Source License

Declaration

static void releaseTemporaryDirectBuffer(ByteBuffer buf) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.lang.ref.SoftReference;
import java.nio.ByteBuffer;

public class Main {
    private static final int TEMP_BUF_POOL_SIZE = 3;
    private static ThreadLocal<SoftReference<ByteBuffer>>[] bufferPool;

    static void releaseTemporaryDirectBuffer(ByteBuffer buf) {
        if (buf == null)
            return;
        // Put it in an empty slot if such exists
        for (int i = 0; i < TEMP_BUF_POOL_SIZE; i++) {
            SoftReference<ByteBuffer> ref = (bufferPool[i].get());
            if ((ref == null) || (ref.get() == null)) {
                bufferPool[i].set(new SoftReference<>(buf));
                return;
            }//  w  w  w .  j  a va 2s  .co m
        }
        // Otherwise replace a smaller one in the cache if such exists
        for (int i = 0; i < TEMP_BUF_POOL_SIZE; i++) {
            SoftReference ref = (bufferPool[i].get());
            ByteBuffer inCacheBuf = (ByteBuffer) ref.get();
            if ((inCacheBuf == null) || (buf.capacity() > inCacheBuf.capacity())) {
                bufferPool[i].set(new SoftReference<>(buf));
                return;
            }
        }
    }
}

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