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package com.sun.grizzly.arp;

import com.sun.grizzly.http.ProcessorTask;



/**
 * A interface used to define the execution of a {@link AsyncTask}
 * By default, {@link AsyncTask} will invoke an implementation
 * of this interface in this order:
 * 
 * (1) preExecute()
 * (2) interrupt()
 * (3) postExecute()
 *
 * Implementation of this interface must decide when a task must be interrupted.
 *
 * @author Jeanfrancois Arcand
 */
public interface AsyncExecutor {
    
    /**
     * Pre-execute some http request operation like decoding the headers. 
     * @return true if the processing can continue.
     */
    public boolean preExecute() throws Exception;
    
    
    /**
     * Interrupt the current request processing. To resume, just invoke
     * the {@link #execute}
     * @return true if the processing can continue, false if it needs to be 
     *              interrupted.
     */    
    public boolean interrupt() throws Exception;
    
    
    /**
     * Execute the defined {@link Adapter} or {@link GrizzlyAdapter}
     * @return true if the processing can continue, false if it needs to be 
     *              interrupted.
     */    
    public boolean execute() throws Exception;    
    
    
    /**
     * Commit the http response.
     * @return true if the processing can continue.
     */    
    public boolean postExecute() throws Exception;
    
    /**
     * finish the processing on this connection until new data come.
     * @return true if the processing can continue.
     */
    public boolean finishExecute() throws Exception;
    
    /**
     * Set the {@link AsyncProcesssorTask}.
     */
    public void setAsyncTask(AsyncTask task);

    
    /**
     * Get the {@link AsyncProcesssorTask}.
     */    
    public AsyncTask getAsyncTask();
    
    
    /**
     * Add a {@link AsyncFilter}
     */
    public void addAsyncFilter(AsyncFilter asyncFilter);
    
    
    /**
     * Remove an {@link AsyncFilter}
     */
    public boolean removeAsyncFilter(AsyncFilter asyncFilter);
    
        
    /**
     * Get the {@link AsyncHandler} who drive the asynchronous process.
     */
    public AsyncHandler getAsyncHandler();
    
    
    /**
     * Set the {@link AsyncHandler} who drive the asynchronous process.
     */
    public void setAsyncHandler(AsyncHandler asyncHandler);
    
    
    /**
     * Set the {@link ProcessorTask} used to execute the request processing.
     * @param task a {@link ProcessorTask} 
     */    
    public void setProcessorTask(ProcessorTask task);
    
    
    /**
     * The {@link ProcessorTask} used to execute the request processing.
     * @return {@link ProcessorTask} used to execute the request processing.
     */        
    public ProcessorTask getProcessorTask();

    /**
     * Reset
     */
    public void reset();

}