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package com.zipwhip.executors;

import com.zipwhip.concurrent.ConfiguredFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * Created by IntelliJ IDEA.
 * User: Russ
 * Date: 8/31/12
 * Time: 2:19 PM
 */
public class DebuggingExecutor extends ExecutorAdapterBase {

    public final static ConfiguredFactory NAMED_FACTORY = new ConfiguredFactory() {
        @Override
        public ExecutorService create(String name) {
            return new DebuggingExecutor(Executors.newSingleThreadExecutor(new NamedThreadFactory(name)));
        }
    };

    private final static Logger LOGGER = LoggerFactory.getLogger(DebuggingExecutor.class);

    protected final List runnableSet = Collections.synchronizedList(new LinkedList());

    public DebuggingExecutor(Executor executor) {
        super(executor);
    }

    @Override
    public synchronized void execute(final Runnable command) {
        final DebugDurationHelper helper = new DebugDurationHelper(String.format("%s:%s", DebuggingExecutor.this, command.toString()));

//        if (LOGGER.isTraceEnabled()) {
            LOGGER.debug(String.format("[%s %s queue=%s]", "enqueue", command, runnableSet));
//        }
        runnableSet.add(command);

        super.execute(new Runnable() {
            @Override
            public void run() {
                try {
                    runnableSet.remove(command);
//                    if (LOGGER.isTraceEnabled()) {
                        LOGGER.debug(String.format("[%s %s queue=%s]", "run", command, runnableSet));
                        LOGGER.debug(helper.start());
//                    }
                    command.run();
                } finally {
//                    if (LOGGER.isTraceEnabled()) {
                        LOGGER.debug(helper.stop());
                        LOGGER.debug(String.format("[%s %s queue=%s]", "finish", command, runnableSet));
//                    }
                }
            }

            @Override
            public String toString() {
                return command.toString();
            }
        });
    }

}