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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) 1995-2018 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.http;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.util.Map;

import org.eclipse.jetty.http.MimeTypes.Type;
import org.eclipse.jetty.util.resource.Resource;

/* ------------------------------------------------------------ */
/** HttpContent interface.
 * This information represents all the information about a 
 * static resource that is needed to evaluate conditional headers
 * and to serve the content if need be.     It can be implemented
 * either transiently (values and fields generated on demand) or 
 * persistently (values and fields pre-generated in anticipation of
 * reuse in from a cache).
 *  
 *
 */
public interface HttpContent
{
    HttpField getContentType();
    String getContentTypeValue();
    String getCharacterEncoding();
    Type getMimeType();

    HttpField getContentEncoding();
    String getContentEncodingValue();
    
    HttpField getContentLength();
    long getContentLengthValue();
    
    HttpField getLastModified();
    String getLastModifiedValue();
    
    HttpField getETag();
    String getETagValue();
    
    ByteBuffer getIndirectBuffer();
    ByteBuffer getDirectBuffer();
    Resource getResource();
    InputStream getInputStream() throws IOException;
    ReadableByteChannel getReadableByteChannel() throws IOException;
    void release();

    Map getPrecompressedContents();
    
    
    public interface ContentFactory
    {
        /**
         * @param path The path within the context to the resource
         * @param maxBuffer The maximum buffer to allocated for this request.  For cached content, a larger buffer may have
         * previously been allocated and returned by the {@link HttpContent#getDirectBuffer()} or {@link HttpContent#getIndirectBuffer()} calls.
         * @return A {@link HttpContent}
         * @throws IOException if unable to get content
         */
        HttpContent getContent(String path,int maxBuffer) throws IOException;
    }
}