[client] Memory management; handle OOM when hashing, do not skip blocks

Try to free some references regarding transfers earlier, e.g. the hash
worker and list of hashes as soon as hashing is finished on upload, not
only when the upload is finished and the window is closed.
Properly delay hashing of blocks in OOM scenarios, and be more
conservative with the number of hash workers, i.e. take maximum JVM
memory into account.
Also, improve thread naming.

1 files changed, 16 insertions, 11 deletions

diff --git a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/wizard/ImageCreationWizard.java b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/wizard/ImageCreationWizard.java
index 0bfe2b22..0c56a5c0 100644
--- a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/wizard/ImageCreationWizard.java
+++ b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/wizard/ImageCreationWizard.java
@@ -291,22 +291,24 @@ public class ImageCreationWizard extends Wizard implements UiFeedback, QuitNotif
 	}
 
 	@Override protected boolean onCancelRequest() {
-		if (state.uuid == null)
+		if (state == null || state.uuid == null)
 			return true; // Allow closing - nothing in progress
 		boolean confirmed = Gui.showMessageBox(this,
 				I18n.WIZARD.getString("ImageCreation.Message.yesNo.cancelRequest"),
 				MessageType.QUESTION_YESNO, null, null);
 		if (confirmed) {
 			QuickTimer.scheduleOnce(new Task() {
-				@Override public void fire() {
-					if (state.upload != null) {
+				@Override
+				public void fire() {
+					if (state != null && state.upload != null) {
 						state.upload.cancelError("Cancelled through aborting wizard");
-					}
-					// As we're creating a new VM, delete base image aswell
-					try {
-						ThriftManager.getSatClient().deleteImageBase(Session.getSatelliteToken(), state.uuid);
-					} catch (TException e) {
-						LOGGER.debug("Error canceling upload on sat: ", e);
+						// As we're creating a new VM, delete base image aswell
+						try {
+							ThriftManager.getSatClient()
+									.deleteImageBase(Session.getSatelliteToken(), state.uuid);
+						} catch (TException e) {
+							LOGGER.debug("Error canceling upload on sat: ", e);
+						}
 					}
 				}
 			});
@@ -315,7 +317,7 @@ public class ImageCreationWizard extends Wizard implements UiFeedback, QuitNotif
 	}
 
 	@Override public boolean wantConfirmQuit() {
-		return state.uuid != null;
+		return state != null && state.uuid != null;
 	}
 
 	@Override public void escapePressed() {
@@ -330,7 +332,10 @@ public class ImageCreationWizard extends Wizard implements UiFeedback, QuitNotif
 
 	@Override
 	protected void doCleanup() {
-		state = null;
+		if (state != null) {
+			state.upload = null;
+			state = null;
+		}
 		containerDefinition = null;
 		currentPages.clear();
 	}