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package com.sun.grizzly.strategies;

import java.io.IOException;
import java.util.concurrent.Executor;
import com.sun.grizzly.Connection;
import com.sun.grizzly.IOEvent;
import com.sun.grizzly.ProcessorRunnable;
import com.sun.grizzly.Strategy;
import com.sun.grizzly.nio.NIOConnection;
import com.sun.grizzly.nio.NIOTransport;
import com.sun.grizzly.nio.SelectorRunner;
import com.sun.grizzly.utils.CurrentThreadExecutor;
import com.sun.grizzly.utils.WorkerThreadExecutor;

/**
 * {@link Strategy}, which executes {@link Processor}s in a current threads, and
 * resumes selector thread logic in separate thread.
 *
 * @author Alexey Stashok
 */
public class LeaderFollowerStrategy implements Strategy {
    private Executor sameThreadProcessorExecutor;
    private Executor workerThreadProcessorExecutor;

    public LeaderFollowerStrategy(NIOTransport transport) {
        this(new CurrentThreadExecutor(), new WorkerThreadExecutor(transport));
    }

    public LeaderFollowerStrategy(Executor sameThreadProcessorExecutor,
            Executor workerThreadProcessorExecutor) {
        
        this.sameThreadProcessorExecutor = sameThreadProcessorExecutor;
        this.workerThreadProcessorExecutor = workerThreadProcessorExecutor;
    }

   /**
    * {@inheritDoc}
    */
    public Boolean prepare(Connection connection, IOEvent ioEvent) {
        return true;
    }

   /**
    * {@inheritDoc}
    */
    public void executeProcessor(Boolean strategyContext,
            ProcessorRunnable processorRunnable) throws IOException {

        if (strategyContext != null && strategyContext) {
            NIOConnection nioConnection =
                    (NIOConnection) processorRunnable.getConnection();
            SelectorRunner runner = nioConnection.getSelectorRunner();
            runner.postpone();
            nioConnection.getTransport().getWorkerThreadPool().execute(runner);
        }

        Executor executor = getProcessorExecutor(strategyContext);

        executor.execute(processorRunnable);
    }

   /**
    * {@inheritDoc}
    */
    public boolean isTerminateThread(Boolean strategyContext) {
        return strategyContext;
    }

    public Executor getProcessorExecutor(Boolean strategyContext) {
        if (strategyContext != null && strategyContext) {
            return sameThreadProcessorExecutor;
        }

        return workerThreadProcessorExecutor;
    }
}