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package org.glassfish.grizzly.config.dom;

import org.jvnet.hk2.config.Attribute;
import org.jvnet.hk2.config.ConfigBeanProxy;
import org.jvnet.hk2.config.Configured;
import org.jvnet.hk2.config.Dom;
import org.jvnet.hk2.config.DuckTyped;
import org.jvnet.hk2.config.types.PropertyBag;

import java.beans.PropertyVetoException;
import java.util.ArrayList;
import java.util.List;

@Configured
public interface ThreadPool extends ConfigBeanProxy, PropertyBag {
    String DEFAULT_THREAD_POOL_CLASS_NAME =
            "org.glassfish.grizzly.threadpool.GrizzlyExecutorService";
    
    int IDLE_THREAD_TIMEOUT = 900;
    int MAX_QUEUE_SIZE = 4096;

    // min and max are set to the same value to force the use
    // of the fixed thread pool in default configuration cases.
    // This thread pool offers better performance characteristics
    // over the sync thread pool.
    int MAX_THREADPOOL_SIZE = 5;
    int MIN_THREADPOOL_SIZE = 5;

    /**
     * The classname of a thread pool implementation
     */
    @Attribute(defaultValue = DEFAULT_THREAD_POOL_CLASS_NAME)
    String getClassname();

    void setClassname(String value);

    /**
     * Idle threads are removed from pool, after this time (in seconds)
     */
    @Attribute(defaultValue = "" + IDLE_THREAD_TIMEOUT, dataType = Integer.class)
    String getIdleThreadTimeoutSeconds();

    void setIdleThreadTimeoutSeconds(String value);

    /**
     * The maxim number of tasks, which could be queued on the thread pool.  -1 disables any maximum checks.
     */
    @Attribute(defaultValue = "" + MAX_QUEUE_SIZE, dataType = Integer.class)
    String getMaxQueueSize();

    void setMaxQueueSize(String value);

    /**
     * Maximum number of threads in the thread pool servicing
     * requests in this queue. This is the upper bound on the no. of
     * threads that exist in the thread pool.
     */
    @Attribute(defaultValue = "" + MAX_THREADPOOL_SIZE, dataType = Integer.class)
    String getMaxThreadPoolSize();

    void setMaxThreadPoolSize(String value) throws PropertyVetoException;

    /**
     * Minimum number of threads in the thread pool servicing
     * requests in this queue. These are created up front when this
     * thread pool is instantiated
     */
    @Attribute(defaultValue = "" + MIN_THREADPOOL_SIZE, dataType = Integer.class)
    String getMinThreadPoolSize();

    void setMinThreadPoolSize(String value);

    /**
     * This is an id for the work-queue e.g. "thread-pool-1", "thread-pool-2" etc
     */
    @Attribute(required = true, key = true)
    String getName();

    void setName(String value);

    /**
     * This is an id for the work-queue e.g. "thread-pool-1", "thread-pool-2" etc
     */
    @Attribute
    @Deprecated
    String getThreadPoolId();

    void setThreadPoolId(String value);

    @DuckTyped
    List<NetworkListener> findNetworkListeners();

    class Duck {

        static public List<NetworkListener> findNetworkListeners(ThreadPool threadpool) {
            NetworkConfig config = threadpool.getParent().getParent(NetworkConfig.class);
            if (!Dom.unwrap(config).getProxyType().equals(NetworkConfig.class)) {
                config = Dom.unwrap(config).element("network-config").createProxy();
            }
            List<NetworkListener> listeners = config.getNetworkListeners().getNetworkListener();
            List<NetworkListener> refs = new ArrayList<NetworkListener>();
            for (NetworkListener listener : listeners) {
                if (listener.getThreadPool().equals(threadpool.getName())) {
                    refs.add(listener);
                }
            }
            return refs;
        }

    }
}