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package org.glassfish.grizzly;

import java.io.IOException;

/**
 * The {@link IOEvent} life-cycle listener, which will be notified about changes
 * in {@link IOEvent} processing statuses.
 * 
 * @author Alexey Stashok
 */
public interface IOEventLifeCycleListener {
    /**
     * {@link IOEvent} processing suspended.
     *
     * @param context
     * @throws IOException
     */
    public void onContextSuspend(Context context) throws IOException;

    /**
     * {@link IOEvent} processing resumed.
     *
     * @param context
     * @throws IOException
     */
    public void onContextResume(Context context) throws IOException;

    /**
     * Processing switched to the manual IOEvent control.
     * {@link Connection#enableIOEvent(org.glassfish.grizzly.IOEvent)} or
     * {@link Connection#disableIOEvent(org.glassfish.grizzly.IOEvent)} might be
     * explicitly called.
     * 
     * @param context
     */
    public void onContextManualIOEventControl(final Context context) throws IOException;

    /**
     * Reregister {@link IOEvent} interest.
     *
     * @param context
     * @throws IOException
     */
    public void onReregister(Context context) throws IOException;

    /**
     * {@link IOEvent} processing completed.
     * 
     * @param context 
     * @throws IOException
     */
    public void onComplete(Context context, Object data) throws IOException;

    /**
     * Detaching {@link IOEvent} processing out of this {@link Context}.
     *
     * @param context
     * @throws IOException
     */
    public void onLeave(Context context) throws IOException;

    /**
     * Terminate {@link IOEvent} processing in this thread, but it's going to
     * be continued later.
     *
     * @param context
     * @throws IOException
     * 
     * @deprecated will never be invoked
     */
    public void onTerminate(Context context) throws IOException;

    /**
     * Re-run {@link IOEvent} processing.
     *
     * @param context original {@link Context} to be rerun
     * @param newContext new context, which will replace original {@link Context}
     * @throws IOException
     */
    public void onRerun(Context context, Context newContext) throws IOException;

    /**
     * Error occurred during {@link IOEvent} processing.
     *
     * @param context
     */
    public void onError(Context context, Object description) throws IOException;

    /**
     * {@link IOEvent} wasn't processed.
     *
     * @param context
     */
    public void onNotRun(Context context) throws IOException;

    /**
     * Empty {@link IOEventLifeCycleListener} implementation.
     */
    public class Adapter implements IOEventLifeCycleListener {

        /**
         * {@inheritDoc}
         */
        @Override
        public void onContextSuspend(Context context) throws IOException {
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void onContextResume(Context context) throws IOException {
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void onComplete(Context context, Object data) throws IOException {
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void onTerminate(Context context) throws IOException {
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void onError(Context context, Object description) throws IOException {
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void onNotRun(Context context) throws IOException {
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void onContextManualIOEventControl(Context context) throws IOException {
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void onReregister(Context context) throws IOException {
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void onLeave(Context context) throws IOException {
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public void onRerun(Context context, Context newContext) throws IOException {
        }
    }
}




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