| /* |
| * Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com> and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| package org.eclipse.jgit.lfs.server.fs; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.Channels; |
| import java.nio.channels.ReadableByteChannel; |
| import java.nio.channels.WritableByteChannel; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| import javax.servlet.AsyncContext; |
| import javax.servlet.ServletOutputStream; |
| import javax.servlet.WriteListener; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.http.HttpStatus; |
| import org.eclipse.jgit.lfs.lib.AnyLongObjectId; |
| import org.eclipse.jgit.lfs.lib.Constants; |
| import org.eclipse.jgit.util.HttpSupport; |
| |
| /** |
| * Handle asynchronous large object download. |
| * |
| * @since 4.7 |
| */ |
| public class ObjectDownloadListener implements WriteListener { |
| |
| private static Logger LOG = Logger |
| .getLogger(ObjectDownloadListener.class.getName()); |
| |
| private final AsyncContext context; |
| |
| private final HttpServletResponse response; |
| |
| private final ServletOutputStream out; |
| |
| private final ReadableByteChannel in; |
| |
| private final WritableByteChannel outChannel; |
| |
| private ByteBuffer buffer = ByteBuffer.allocateDirect(8192); |
| |
| /** |
| * <p>Constructor for ObjectDownloadListener.</p> |
| * |
| * @param repository |
| * the repository storing large objects |
| * @param context |
| * the servlet asynchronous context |
| * @param response |
| * the servlet response |
| * @param id |
| * id of the object to be downloaded |
| * @throws java.io.IOException |
| */ |
| public ObjectDownloadListener(FileLfsRepository repository, |
| AsyncContext context, HttpServletResponse response, |
| AnyLongObjectId id) throws IOException { |
| this.context = context; |
| this.response = response; |
| this.in = repository.getReadChannel(id); |
| this.out = response.getOutputStream(); |
| this.outChannel = Channels.newChannel(out); |
| |
| response.addHeader(HttpSupport.HDR_CONTENT_LENGTH, |
| String.valueOf(repository.getSize(id))); |
| response.setContentType(Constants.HDR_APPLICATION_OCTET_STREAM); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Write file content |
| */ |
| @Override |
| public void onWritePossible() throws IOException { |
| while (out.isReady()) { |
| try { |
| buffer.clear(); |
| if (in.read(buffer) < 0) { |
| buffer = null; |
| } else { |
| buffer.flip(); |
| } |
| } catch (Throwable t) { |
| LOG.log(Level.SEVERE, t.getMessage(), t); |
| buffer = null; |
| } finally { |
| if (buffer != null) { |
| outChannel.write(buffer); |
| } else { |
| try { |
| in.close(); |
| } catch (IOException e) { |
| LOG.log(Level.SEVERE, e.getMessage(), e); |
| } |
| try { |
| out.close(); |
| } finally { |
| context.complete(); |
| } |
| // This is need to avoid endless loop in recent Jetty versions. |
| // That's because out.isReady() is returning true for already |
| // closed streams and because out.close() doesn't throw any |
| // exception any more when trying to close already closed stream. |
| return; |
| } |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Handle errors |
| */ |
| @Override |
| public void onError(Throwable e) { |
| try { |
| FileLfsServlet.sendError(response, |
| HttpStatus.SC_INTERNAL_SERVER_ERROR, e.getMessage()); |
| context.complete(); |
| in.close(); |
| } catch (IOException ex) { |
| LOG.log(Level.SEVERE, ex.getMessage(), ex); |
| } |
| } |
| } |