org.eclipse.packagedrone.repo.web.utils.ChannelCacheHandler.java Source code

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Here is the source code for org.eclipse.packagedrone.repo.web.utils.ChannelCacheHandler.java

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/*******************************************************************************
 * Copyright (c) 2015 IBH SYSTEMS GmbH.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBH SYSTEMS GmbH - initial API and implementation
 *******************************************************************************/
package org.eclipse.packagedrone.repo.web.utils;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.packagedrone.repo.MetaKey;
import org.eclipse.packagedrone.repo.channel.ReadableChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.io.ByteStreams;

public class ChannelCacheHandler {
    private final static Logger logger = LoggerFactory.getLogger(ChannelCacheHandler.class);

    private final MetaKey key;

    public ChannelCacheHandler(final MetaKey key) {
        this.key = key;
    }

    public void process(final ReadableChannel channel, final HttpServletRequest request,
            final HttpServletResponse response) throws IOException {
        if (!channel.streamCacheEntry(this.key, (cacheEntry) -> {
            response.setContentType(cacheEntry.getMimeType());
            response.setContentLengthLong(cacheEntry.getSize());
            response.setDateHeader("Last-Modified", cacheEntry.getTimestamp().toEpochMilli());
            final long len = ByteStreams.copy(cacheEntry.getStream(), response.getOutputStream());
            logger.trace("Transfered {} bytes of data from cache entry: {}", len, this.key);
        })) {
            logger.warn("Unable to find channel cache entry: {}", this.key);
            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
            response.setContentType("text/plain");
            response.getWriter().format("Unable to find: %s", request.getRequestURI());
        }
    }
}