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Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

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//
//  ========================================================================
//  Copyright (c) 1995-2012 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.io;

import java.io.IOException;

/* ------------------------------------------------------------ */
/** Abstract Connection used by Jetty Connectors.
 * 
 * Jetty will call the handle method of a connection when there is work
 * to be done on the connection.  For blocking connections, this is soon
 * as the connection is open and handle will keep being called until the
 * connection is closed.   For non-blocking connections, handle will only
 * be called if there are bytes to be read or the connection becomes writable
 * after being write blocked.
 *
 * @see org.eclipse.jetty.io.nio.SelectorManager
 */
public interface Connection
{
    /* ------------------------------------------------------------ */
    /**
     * Handle the connection.
     * @return The Connection to use for the next handling of the connection.
     * This allows protocol upgrades and support for CONNECT.
     * @throws IOException if the handling of I/O operations fail
     */
    Connection handle() throws IOException;

    /**
     * @return the timestamp at which the connection was created
     */
    long getTimeStamp();

    /**
     * @return whether this connection is idle, that is not parsing and not generating
     * @see #onIdleExpired(long)
     */
    boolean isIdle();

    /**
     * 
The semantic of this method is to return true to indicate interest in further reads,
     * or false otherwise, but it is misnamed and should be really called isReadInterested().
     *
     * @return true to indicate interest in further reads, false otherwise
     */
    // TODO: rename to isReadInterested() in the next release
    boolean isSuspended();

    /**
     * Called after the connection is closed
     */
    void onClose();

    /**
     * Called when the connection idle timeout expires
     * @param idleForMs how long the connection has been idle
     * @see #isIdle()
     */
    void onIdleExpired(long idleForMs);
}