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package com.sun.grizzly.samples.echo;

import java.io.IOException;
import com.sun.grizzly.filterchain.FilterAdapter;
import com.sun.grizzly.filterchain.FilterChain;
import com.sun.grizzly.filterchain.FilterChainContext;
import com.sun.grizzly.filterchain.NextAction;
import com.sun.grizzly.streams.StreamWriter;

/**
 * Implementation of {@link FilterChain} filter, which replies with the request
 * message.
 * In TCP {@link EchoServer} sample, we initialize {@link TransportFilter} to
 * operate in stream mode, which fits better for TCP transport, so
 * <tt>EchoFilter</tt>, unlike in UDP transport example, should operate with
 * context streams, not messages.
 *
 * @author Ming Qin mingqin1@yahoo.com
 * @author Alexey Stashok
 */
public class EchoFilter extends FilterAdapter {

    /**
     * Handle just read operation, when some message has come and ready to be
     * processed.
     *
     * @param ctx Context of {@link FilterChainContext} processing
     * @param nextAction default {@link NextAction} filter chain will execute
     *                   after processing this {@link Filter}. Could be modified.
     * @return the next action
     * @throws java.io.IOException
     */
    @Override
    public NextAction handleRead(FilterChainContext ctx, NextAction nextAction)
            throws IOException {
        // Redirect Input to Output
        ctx.getStreamWriter().writeStream(ctx.getStreamReader());

        return nextAction;
    }

    @Override
    public NextAction handleAccept(final FilterChainContext ctx,
            final NextAction nextAction) throws IOException {



        final StreamWriter writer = ctx.getStreamWriter();

        writer.writeByteArray("   Grizzly Echo Server is UP !! \r\n".getBytes());
        writer.flush();
        return nextAction;
    }

     @Override
    public NextAction handleIdle(final FilterChainContext ctx,
            final NextAction nextAction) throws IOException {

        final StreamWriter writer = ctx.getStreamWriter();

        writer.writeByteArray( ( " IOEvent.IDLE is being handled !!! " +
                Thread.currentThread().getName() + " " + " current system time : " + 
                String.valueOf(System.currentTimeMillis()) + " \r\n").getBytes());
        writer.flush();
        return nextAction;
    }

}
