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package com.sun.grizzly.async;

import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;

/**
 * Interface represents condition, which will be checked when 
 * {@link AsyncQueueReader} was able to read new portion of data from 
 * {@link SelectableChannel}, whoch is associated with a
 * {@link SelectionKey}. Custom condition code could decide whether read data
 * is enough to call AsyncReadCallbackHandler.onReadCompleted() or
 * more data is expected.
 * 
 * @author Alexey Stashok
 */
public interface AsyncReadCondition {
    /**
     * Method checks, whether data, which was read to the {@link ByteBuffer},
     * is read completely, or custom code expects more data.
     * 
     * @param key {@link SelectionKey}
     * @param srcAddress {@link SocketAddress} remote address data was read from
     * @param buffer {@link ByteBuffer} data was read to
     * @return true, if data reading is completed, false - if mora data is expected
     */
    public boolean checkAsyncReadCompleted(SelectionKey key, 
            SocketAddress srcAddress, ByteBuffer buffer);
}