svn-gvsig-desktop / branches / MULTITHREADING_DEVELOPMENT / libraries / libRemoteServices / src / org / gvsig / remoteClient / taskplanning / retrieving / RequestManager.java @ 5246
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/*
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* Created on 01-oct-2005
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*/
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package org.gvsig.remoteClient.taskplanning.retrieving; |
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import java.io.File; |
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import java.net.MalformedURLException; |
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import java.util.ArrayList; |
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import java.util.TreeMap; |
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import java.util.Vector; |
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import org.gvsig.remoteClient.taskplanning.IQueue; |
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/**
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* pa administrar les tasques (la hist?ria aquella
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* de que hi haja una cola per a cada servidor)
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* @author Luis W. Sevilla (sevilla_lui@gva.es)
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*/
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public class RequestManager { |
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private boolean debug = true; |
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private static RequestManager instance; |
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private TreeMap serversTable = new TreeMap(); |
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private RequestManager() {} // Avoid public instantiation |
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public static RequestManager getInstance() { |
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if (instance == null) |
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instance = new RequestManager();
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return instance;
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} |
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public URLRetrieveTask addURLRequest(URLRequest request, RetrieveListener listener) {
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try {
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if (downloadedFiles.contains(request)) {
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for (int i = 0; i < downloadedFiles.size(); i++) { |
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URLRequest r = (URLRequest) downloadedFiles.get(i); |
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if (r.equals(request)) {
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request = r; |
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break;
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} |
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} |
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System.out.println(request.getUrl()+" is cached at '"+request.getFileName()+"'"); |
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synchronized (this) { |
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if (request.getStatus() == RetrieveEvent.REQUEST_FINISHED) {
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if (debug)
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System.err.println("done job found: "+request.getUrl()); |
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RetrieveEvent event = new RetrieveEvent();
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event.setType(RetrieveEvent.REQUEST_FINISHED); |
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listener.transferEventReceived(event); |
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} else if (request.getStatus() == RetrieveEvent.REQUEST_CANCELLED) { |
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removeURLRequest(request); |
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return addURLRequest(request, listener);
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} else {
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if (debug)
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System.err.println("working job found: "+request.getUrl()); |
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request.lock(); |
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request.addRetrieveListener(listener); |
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request.unlock(); |
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} |
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} |
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} else {
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// Pick an unrepeatable fileName
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String host = request.getHost();
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String fileName = request.getFileName();
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File tempDir = new File(tempDirectoryPath); |
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if (!tempDir.exists())
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tempDir.mkdir(); |
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String fileNamePrefix = tempDirectoryPath +
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File.separator + host +
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"-" ;
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if (fileName.startsWith(fileNamePrefix))
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fileName = fileName.substring(fileNamePrefix.length(), fileName.length()); |
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// get this server's task queue
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RetrieveQueue serverQueue = (RetrieveQueue) getQueue(request.getHost()); |
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fileName = fileNamePrefix + fileName; |
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request.setFileName(fileName); |
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synchronized (this) { |
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addDownloadedURLRequest(request); |
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} |
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// TODO
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// jo ac? comprovaria quin protocol, m?tode, host, etc... i crearia un
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// objecte que tractara la desc?rrega segons el m?tode que li toca.
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// algo en plan Strategy's
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//
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// per exemple si fem URLRetrieveTask una abstracta i tenim
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//
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// GET de tota la vida
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// serverQueue.put(new HTTPGetRetrieveTask(request, listener));
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//
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// POST
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// serverQueue.put(new HTTPPostRetrieveTask(request, listener));
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//
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// FTP
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// serverQueue.put(new FTPRetrieveTask(request, listener));
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//
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// ????Xarxa local?????
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// serverQueue.put(new SMBRetrieveTask(request, listener));
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// Enqueue the request and the listener will be notified when done.
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request.addRetrieveListener(listener); |
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URLRetrieveTask task = new URLRetrieveTask(request);
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return (URLRetrieveTask) serverQueue.put(task);
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} |
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} catch (MalformedURLException e) { |
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e.printStackTrace(); |
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} |
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return null; |
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} |
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private IQueue getQueue(String hostName) { |
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RetrieveQueue queue = null;
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if (serversTable.containsKey(hostName))
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queue = (RetrieveQueue) serversTable.get(hostName); |
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else {
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// crea la cola
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queue = new RetrieveQueue(hostName);
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// pone la cola del server en marcha.
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} |
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return queue;
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} |
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private Vector downloadedFiles = new Vector(); |
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private final String tempDirectoryPath = System.getProperty("java.io.tmpdir")+"tmp-andami"; |
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/**
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* Remove an URL from the system cache. The file will remain in the file
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* system for further eventual uses.
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* @param request
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*/
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public void removeURLRequest(URLRequest request) { |
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if (downloadedFiles != null && downloadedFiles.contains(request)) |
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downloadedFiles.remove(request); |
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} |
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/**
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* Adds an URL to the table of downloaded files for further uses. If the URL
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* already exists in the table its filePath value is updated to the new one and
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* the old file itself is removed from the file system.
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*
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* @param url
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* @param filePath
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*/
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private void addDownloadedURLRequest(URLRequest request){ |
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if (!downloadedFiles.contains(request)) {
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downloadedFiles.add(request); |
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} |
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} |
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} |