| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.maven.mercury.spi.http.client.retrieve; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.maven.mercury.crypto.api.StreamObserver; |
| import org.apache.maven.mercury.logging.IMercuryLogger; |
| import org.apache.maven.mercury.logging.MercuryLoggerManager; |
| import org.apache.maven.mercury.spi.http.client.FileExchange; |
| import org.apache.maven.mercury.spi.http.client.HttpClientException; |
| import org.apache.maven.mercury.spi.http.client.ObservableOutputStream; |
| import org.apache.maven.mercury.transport.api.Binding; |
| import org.apache.maven.mercury.transport.api.Server; |
| import org.mortbay.io.Buffer; |
| import org.mortbay.io.BufferUtil; |
| import org.mortbay.jetty.HttpHeaders; |
| import org.mortbay.jetty.HttpMethods; |
| import org.mortbay.jetty.client.HttpClient; |
| |
| |
| /** |
| * FileGetExchange |
| * <p/> |
| * Make an asynchronous request to download a file and stream its bytes to a file. |
| * When all bytes have been received onFileComplete will be called. |
| * <p/> |
| * As an optimization, the file that is being downloaded can have it's |
| * SHA-1 digest calculated as it is being streamed down. |
| */ |
| public abstract class FileGetExchange extends FileExchange |
| { |
| private static final IMercuryLogger log = MercuryLoggerManager.getLogger(FileGetExchange.class); |
| private OutputStream _outputStream; |
| private Set<StreamObserver> _observers = new HashSet<StreamObserver>(); |
| int _contentLength = -1; |
| |
| /** |
| * Constructor. |
| * |
| * @param binding the remote file to fetch |
| * @param localFile the local file location to store the remote file |
| * @param observers observers of the io stream |
| * @param client async http client |
| */ |
| public FileGetExchange( Server server, Binding binding, File localFile, Set<StreamObserver> observers, HttpClient client ) |
| { |
| super( server, binding, localFile, client ); |
| if (observers != null) |
| _observers.addAll(observers); |
| } |
| |
| |
| /** Start the retrieval. */ |
| public void send() |
| { |
| setMethod( HttpMethods.GET ); |
| super.send(); |
| } |
| |
| protected void onResponseHeader(Buffer name, Buffer value) throws IOException |
| { |
| int header = HttpHeaders.CACHE.getOrdinal(value); |
| switch (header) |
| { |
| case HttpHeaders.CONTENT_LENGTH_ORDINAL: |
| _contentLength = BufferUtil.toInt(value); |
| for (StreamObserver o:_observers) |
| { |
| o.setLength(_contentLength); |
| } |
| if (log.isDebugEnabled()) |
| log.debug("GET of "+_contentLength +" bytes"); |
| break; |
| case HttpHeaders.LAST_MODIFIED_ORDINAL: |
| for (StreamObserver o:_observers) |
| { |
| o.setLastModified(BufferUtil.to8859_1_String(value)); |
| } |
| break; |
| } |
| } |
| |
| |
| protected void onResponseComplete() |
| { |
| //All bytes of file have been received |
| try |
| { |
| if (_outputStream != null) |
| _outputStream.close(); |
| |
| if ( _status == HttpServletResponse.SC_NOT_FOUND ) |
| { |
| onFileError( _url, new FileNotFoundException( "File not found on remote server" ) ); |
| return; |
| } |
| else if ( _status != HttpServletResponse.SC_OK ) |
| { |
| onFileError( _url, new Exception( "Http status code=" + _status ) ); |
| return; |
| } |
| |
| onFileComplete( _url, _localFile ); |
| } |
| catch ( Exception e ) |
| { |
| onFileError( _url, new HttpClientException( _binding, e.getLocalizedMessage() ) ); |
| } |
| } |
| |
| |
| /** |
| * Stream the downloaded bytes to a file |
| * |
| * @see org.mortbay.jetty.client.HttpExchange$ContentExchange#onResponseContent(org.sonatype.io.Buffer) |
| */ |
| protected void onResponseContent( Buffer content ) |
| throws IOException |
| { |
| try |
| { |
| OutputStream os = getOutputStream(); |
| content.writeTo( os ); |
| } |
| catch ( NoSuchAlgorithmException e ) |
| { |
| throw new IOException( e.getLocalizedMessage() ); |
| } |
| } |
| |
| |
| /** |
| * Get an output stream for the file contents. A digest can be optionally calculated |
| * for the file contents as they are being streamed. |
| * |
| * @return OutputStream for file contents |
| * @throws IOException if io error occurs |
| * @throws NoSuchAlgorithmException if the SHA-1 algorithm is not supported |
| */ |
| protected OutputStream getOutputStream() |
| throws IOException, NoSuchAlgorithmException |
| { |
| if ( _outputStream == null ) |
| { |
| OutputStream os = null; |
| if (_binding.isFile()) |
| os = new FileOutputStream( _localFile ); |
| else if (_binding.isInMemory()) |
| os = _binding.getLocalOutputStream(); |
| |
| ObservableOutputStream oos = new ObservableOutputStream( os ); |
| oos.addObservers(_observers); |
| _outputStream = oos; |
| } |
| return _outputStream; |
| } |
| } |