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package com.sun.grizzly.memory;

import com.sun.grizzly.Buffer;

/**
 * MemoryManager, responsible for allocating and releasing memory,
 * required during application runtime.
 * MemoryManager implementations work with Grizzly {@link Buffer}s.
 *
 * @see Buffer
 *
 * @author Alexey Stashok
 */
public interface MemoryManager {
    /**
     * Allocated {@link Buffer} of the required size.
     *
     * @param size {@link Buffer} size to be allocated.
     * @return allocated {@link Buffer}.
     */
    public E allocate(int size);

    /**
     * Reallocate {@link Buffer} to a required size.
     * Implementation may choose the way, how reallocation could be done, either
     * by allocating new {@link Buffer} of required size and copying old
     * {@link Buffer} content there, or perform more complex logic related to
     * memory pooling etc.
     *
     * @param oldBuffer old {@link Buffer} to be reallocated.
     * @param newSize new {@link Buffer} required size.
     * @return reallocated {@link Buffer}.
     */
    public E reallocate(E oldBuffer, int newSize);

    /**
     * Release {@link Buffer}.
     * Implementation may ignore releasing and let JVM Garbage collector to take
     * care about the {@link Buffer}, or return {@link Buffer} to pool, in case
     * of more complex MemoryManager implementation.
     *
     * @param buffer {@link Buffer} to be released.
     */
    public void release(E buffer);
}