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 * and Distribution License("CDDL") (collectively, the "License").  You
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 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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package com.pdd.pop.ext.glassfish.grizzly.nio;

import java.io.IOException;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.util.Set;
import com.pdd.pop.ext.glassfish.grizzly.CompletionHandler;

/**
 *
 * @author Alexey Stashok
 */
public interface SelectorHandler {

    /**
     * The default {@link SelectorHandler} used by all created builder instances.
     */
    SelectorHandler DEFAULT_SELECTOR_HANDLER = new DefaultSelectorHandler();

    long getSelectTimeout();

    boolean preSelect(SelectorRunner selectorRunner) throws IOException;
    
    Set select(SelectorRunner selectorRunner) throws IOException;
    
    void postSelect(SelectorRunner selectorRunner) throws IOException;
    
    void registerKeyInterest(SelectorRunner selectorRunner,
                             SelectionKey key,
                             int interest)
    throws IOException;
    
    /**
     * Deregisters SelectionKey interest.
     * 
     * This method must be called from the SelectorRunner's thread only!
     * @throws IOException 
     */
    void deregisterKeyInterest(SelectorRunner selectorRunner,
                               SelectionKey key,
                               int interest)
    throws IOException;

    void registerChannel(SelectorRunner selectorRunner,
                         SelectableChannel channel,
                         int interest,
                         Object attachment)
    throws IOException;

    void registerChannelAsync(
                                    SelectorRunner selectorRunner,
                                    SelectableChannel channel,
                                    int interest,
                                    Object attachment,
                                    CompletionHandler completionHandler);

    /**
     * Deregister the channel from the {@link SelectorRunner}'s Selector.
     * @param selectorRunner {@link SelectorRunner}
     * @param channel {@link SelectableChannel} channel to deregister
     * @throws IOException
     */
    void deregisterChannel(SelectorRunner selectorRunner,
                           SelectableChannel channel) throws IOException;

    /**
     * Deregister the channel from the {@link SelectorRunner}'s Selector.
     * @param selectorRunner {@link SelectorRunner}
     * @param channel {@link SelectableChannel} channel to deregister
     * @param completionHandler {@link CompletionHandler}
     */
    void deregisterChannelAsync(
                                    SelectorRunner selectorRunner,
                                    SelectableChannel channel,
                                    CompletionHandler completionHandler);


    /**
     * Execute task in a selector thread.
     * Unlike {@link #enque(com.pdd.pop.ext.glassfish.grizzly.nio.SelectorRunner, com.pdd.pop.ext.glassfish.grizzly.nio.SelectorHandler.Task, com.pdd.pop.ext.glassfish.grizzly.CompletionHandler)},
     * this operation will execute the task immediately if the current
     * is a selector thread.
     * 
     * @param selectorRunner
     * @param task
     * @param completionHandler
     */
    void execute(
                                    final SelectorRunner selectorRunner,
                                    final Task task,
                                    final CompletionHandler completionHandler);

    /**
     * Execute task in a selector thread.
     * Unlike {@link #execute(com.pdd.pop.ext.glassfish.grizzly.nio.SelectorRunner, com.pdd.pop.ext.glassfish.grizzly.nio.SelectorHandler.Task, com.pdd.pop.ext.glassfish.grizzly.CompletionHandler)},
     * this operation will postpone the task execution if current thread
     * is a selector thread, and execute it during the next
     * {@link #select(com.pdd.pop.ext.glassfish.grizzly.nio.SelectorRunner)} iteration.
     * 
     * @param selectorRunner
     * @param task
     * @param completionHandler
     */
    void enque(
                                    final SelectorRunner selectorRunner,
                                    final Task task,
                                    final CompletionHandler completionHandler);

    boolean onSelectorClosed(SelectorRunner selectorRunner);
    
    interface Task {
        boolean run() throws Exception;
    }        
}