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package com.sun.grizzly;

import com.sun.grizzly.Context.OpType;

/**
 * {@link CallbackHandler} task, which will be executed by 
 * {@link Context}, when Context.execute({@link ContextTask}) 
 * is called.
 * 
 * @author Alexey Stashok
 */
public class CallbackHandlerContextTask extends SelectionKeyContextTask {
    
    private CallbackHandler callBackHandler;

    public CallbackHandlerContextTask(CallbackHandler callBackHandler) {
        this.callBackHandler = callBackHandler;
    }
    
    protected Object doCall() throws Exception {
        IOEvent ioEvent = context.getIOEvent();
        OpType currentOpType = context.getCurrentOpType();
        
        try {
            if (currentOpType == OpType.OP_READ) {
                callBackHandler.onRead(ioEvent);
            } else if (currentOpType == OpType.OP_WRITE) {
                callBackHandler.onWrite(ioEvent);
            } else if (currentOpType == OpType.OP_CONNECT) {
                callBackHandler.onConnect(ioEvent);
            }
        } finally {
            if (ioEvent != null) {
                // Prevent the CallbackHandler to re-use the context.
                    // TODO: This is still dangerous as the Context might have been
                    // cached by the CallbackHandler.
                ioEvent.attach(null);
            }
        }

        return null;
    }

    public CallbackHandler getCallBackHandler() {
        return callBackHandler;
    }

    public void setCallBackHandler(CallbackHandler callBackHandler) {
        this.callBackHandler = callBackHandler;
    }

    @Override
    public void recycle() {
        callBackHandler = null;
        super.recycle();
    }
}