pause/resume downloads

core/src/main/groovy/com/muwire/core/download/Downloader.groovy

@@ -25,7 +25,7 @@ import net.i2p.util.ConcurrentHashSet
 
 @Log
 public class Downloader {
-    public enum DownloadState { CONNECTING, HASHLIST, DOWNLOADING, FAILED, CANCELLED, FINISHED }
+    public enum DownloadState { CONNECTING, HASHLIST, DOWNLOADING, FAILED, CANCELLED, PAUSED, FINISHED }
     private enum WorkerState { CONNECTING, HASHLIST, DOWNLOADING, FINISHED}
     
     private static final ExecutorService executorService = Executors.newCachedThreadPool({r ->
@@ -53,7 +53,7 @@ public class Downloader {
     private final Set<Destination> successfulDestinations = new ConcurrentHashSet<>()
     
     
-    private volatile boolean cancelled
+    private volatile boolean cancelled, paused
     private final AtomicBoolean eventFired = new AtomicBoolean()
     private boolean piecesFileClosed
 
@@ -136,6 +136,9 @@ public class Downloader {
     public DownloadState getCurrentState() {
         if (cancelled)
             return DownloadState.CANCELLED
+        if (paused)
+            return DownloadState.PAUSED
+            
         boolean allFinished = true
         activeWorkers.values().each { 
             allFinished &= it.currentState == WorkerState.FINISHED
@@ -183,6 +186,11 @@ public class Downloader {
         pieces.clearAll()
     }
     
+    public void pause() {
+        paused = true
+        stop()
+    }
+    
     void stop() {
         activeWorkers.values().each { 
             it.cancel()
@@ -203,6 +211,7 @@ public class Downloader {
             def worker = activeWorkers.get(destination)
             if (worker != null) {
                 if (worker.currentState == WorkerState.FINISHED) {
+                    paused = false
                     def newWorker = new DownloadWorker(destination)
                     activeWorkers.put(destination, newWorker)
                     executorService.submit(newWorker)

gui/griffon-app/controllers/com/muwire/gui/MainFrameController.groovy

@@ -166,6 +166,12 @@ class MainFrameController {
         downloader.resume()
     }
     
+    @ControllerAction
+    void pause() {
+        def downloader = model.downloads[selectedDownload()].downloader
+        downloader.pause()
+    }
+
     private void markTrust(String tableName, TrustLevel level, def list) {
         int row = builder.getVariable(tableName).getSelectedRow()
         if (row < 0)

gui/griffon-app/models/com/muwire/gui/MainFrameModel.groovy

@@ -68,6 +68,8 @@ class MainFrameModel {
     @Observable boolean trustButtonsEnabled
     @Observable boolean cancelButtonEnabled
     @Observable boolean retryButtonEnabled
+    @Observable boolean pauseButtonEnabled
+    @Observable String resumeButtonText
     
     private final Set<InfoHash> infoHashes = new HashSet<>()
     
@@ -168,6 +170,8 @@ class MainFrameModel {
                 watched.addAll(core.muOptions.watchedDirectories)
                 builder.getVariable("watched-directories-table").model.fireTableDataChanged()
                 watched.each { core.eventBus.publish(new FileSharedEvent(file : new File(it))) }
+                
+                resumeButtonText = "Retry"
             }
         })
         

gui/griffon-app/views/com/muwire/gui/MainFrameView.groovy

@@ -135,8 +135,9 @@ class MainFrameView {
                                     }
                                 }
                                 panel (constraints : BorderLayout.SOUTH) {
+                                    button(text: "Pause", enabled : bind {model.pauseButtonEnabled}, pauseAction)
                                     button(text: "Cancel", enabled : bind {model.cancelButtonEnabled }, cancelAction )
-                                    button(text: "Retry", enabled : bind {model.retryButtonEnabled}, resumeAction)
+                                    button(text: bind { model.resumeButtonText }, enabled : bind {model.retryButtonEnabled}, resumeAction)
                                 }
                             }
                         }
@@ -295,6 +296,7 @@ class MainFrameView {
             if (selectedRow < 0) {
                 model.cancelButtonEnabled = false
                 model.retryButtonEnabled = false
+                model.pauseButtonEnabled = false
                 return
             }
             def downloader = model.downloads[selectedRow]?.downloader
@@ -305,15 +307,25 @@ class MainFrameView {
                 case Downloader.DownloadState.DOWNLOADING :
                 case Downloader.DownloadState.HASHLIST:
                 model.cancelButtonEnabled = true
+                model.pauseButtonEnabled = true
                 model.retryButtonEnabled = false
                 break
                 case Downloader.DownloadState.FAILED:
                 model.cancelButtonEnabled = true
                 model.retryButtonEnabled = true
+                model.resumeButtonText = "Retry"
+                model.pauseButtonEnabled = false
+                break
+                case Downloader.DownloadState.PAUSED:
+                model.cancelButtonEnabled = true
+                model.retryButtonEnabled = true
+                model.resumeButtonText = "Resume"
+                model.pauseButtonEnabled = false
                 break
                 default:
                 model.cancelButtonEnabled = false
                 model.retryButtonEnabled = false
+                model.pauseButtonEnabled = false
             }
         })
         
@@ -421,21 +433,32 @@ class MainFrameView {
         int selected = selectedDownloaderRow()
         if (selected < 0)
             return
+        boolean pauseEnabled = false
         boolean cancelEnabled = false
         boolean retryEnabled = false
+        String resumeText = "Retry"
         Downloader downloader = model.downloads[selected].downloader
         switch(downloader.currentState) {
             case Downloader.DownloadState.DOWNLOADING:
             case Downloader.DownloadState.HASHLIST:
             case Downloader.DownloadState.CONNECTING:
+                pauseEnabled = true
                 cancelEnabled = true
                 retryEnabled = false
                 break
             case Downloader.DownloadState.FAILED:
+                pauseEnabled = false
                 cancelEnabled = true
                 retryEnabled = true
                 break
+            case Downloader.DownloadState.PAUSED:
+                pauseEnabled = false
+                cancelEnabled = true
+                retryEnabled = true
+                resumeText = "Resume"
+                break
             default :
+                pauseEnabled = false
                 cancelEnabled = false
                 retryEnabled = false
         }
@@ -450,6 +473,12 @@ class MainFrameView {
         })
         menu.add(copyHashToClipboard)
         
+        if (pauseEnabled) {
+            JMenuItem pause = new JMenuItem("Pause")
+            pause.addActionListener({mvcGroup.controller.pause()})
+            menu.add(pause)
+        }
+        
         if (cancelEnabled) {
             JMenuItem cancel = new JMenuItem("Cancel")
             cancel.addActionListener({mvcGroup.controller.cancel()})
@@ -457,7 +486,7 @@ class MainFrameView {
         }
         
         if (retryEnabled) {
-            JMenuItem retry = new JMenuItem("Retry")
+            JMenuItem retry = new JMenuItem(resumeText)
             retry.addActionListener({mvcGroup.controller.resume()})
             menu.add(retry)
         }