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package com.sun.grizzly.connectioncache.client;

import com.sun.grizzly.ConnectorHandler;
import com.sun.grizzly.ConnectorHandlerPool;
import com.sun.grizzly.ConnectorInstanceHandler;
import com.sun.grizzly.Controller;
import com.sun.grizzly.Controller.Protocol;
import com.sun.grizzly.DefaultConnectorHandlerPool;
import com.sun.grizzly.connectioncache.spi.transport.ConnectionCacheFactory;
import com.sun.grizzly.connectioncache.spi.transport.ConnectionFinder;
import com.sun.grizzly.connectioncache.spi.transport.OutboundConnectionCache;

/**
 * ConnectorInstanceHandler which use a
 * ConcurrentQueue to pool CacheableConnectorHandler
 *
 * @author Alexey Stashok
 */
public class CacheableConnectorHandlerPool implements
        ConnectorHandlerPool {

    private final Controller controller;
    private final ConnectorHandlerPool protocolConnectorHandlerPool;
    private final ConnectorInstanceHandler connectorInstanceHandler;
    private final OutboundConnectionCache outboundConnectionCache;
    private final ConnectionFinder connectionFinder;

    public CacheableConnectorHandlerPool(Controller controller, int highWaterMark,
            int numberToReclaim, int maxParallel) {
        this(controller, highWaterMark, numberToReclaim, maxParallel, null);
    }

    public CacheableConnectorHandlerPool(Controller controller, int highWaterMark,
            int numberToReclaim, int maxParallel, ConnectionFinder connectionFinder) {
        this(controller, highWaterMark, numberToReclaim, maxParallel, connectionFinder, null);
    }

    public CacheableConnectorHandlerPool(Controller controller, int highWaterMark,
            int numberToReclaim, int maxParallel, ConnectionFinder connectionFinder,
            OutboundConnectionFactory factory) {
        this.controller = controller;
        if (factory == null) {
            this.outboundConnectionCache =
                    ConnectionCacheFactory.makeBlockingOutboundConnectionCache(
                    "Grizzly outbound connection cache", highWaterMark,
                    numberToReclaim, maxParallel, Controller.logger());
        } else {
            this.outboundConnectionCache = factory.makeBlockingOutboundConnectionCache(
                    highWaterMark, numberToReclaim, maxParallel, Controller.logger());
        }
        this.connectionFinder = connectionFinder;
        protocolConnectorHandlerPool = new DefaultConnectorHandlerPool(controller);
        connectorInstanceHandler = new CacheableConnectorInstanceHandler();
    }

    public CacheableConnectorHandler acquireConnectorHandler(Protocol protocol) {
        CacheableConnectorHandler connectorHandler = connectorInstanceHandler.acquire();
        connectorHandler.protocol(protocol);
        return connectorHandler;
    }

    public void releaseConnectorHandler(CacheableConnectorHandler connectorHandler) {
        connectorInstanceHandler.release(connectorHandler);
    }

    public OutboundConnectionCache getOutboundConnectionCache() {
        return outboundConnectionCache;
    }

    public ConnectionFinder getConnectionFinder() {
        return connectionFinder;
    }

    Controller getController() {
        return controller;
    }

    ConnectorHandlerPool getProtocolConnectorHandlerPool() {
        return protocolConnectorHandlerPool;
    }

    /**
     * Default ConnectorInstanceHandler which use a
     * ConcurrentQueue to pool {@link ConnectorHandler}
     */
    private class CacheableConnectorInstanceHandler extends
            ConnectorInstanceHandler.ConcurrentQueueConnectorInstanceHandler {

        public CacheableConnectorHandler newInstance() {
            return new CacheableConnectorHandler(CacheableConnectorHandlerPool.this);
        }
    }
}