From: jsimomaa <jani.simomaa@gmail.com>
Date: Mon, 25 Nov 2019 07:00:08 +0000 (+0200)
Subject: Trying to debug why LRU swap can be stuck in livelock
X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=commitdiff_plain;h=1cac6a3814ed4b828e2c182c129d2941dc3e2742;p=simantics%2Fplatform.git

Trying to debug why LRU swap can be stuck in livelock

gitlab #424

Change-Id: I7e933284969cebba28d36b25c1cdd51c0e49106d
---

diff --git a/bundles/org.simantics.acorn/src/org/simantics/acorn/lru/LRU.java b/bundles/org.simantics.acorn/src/org/simantics/acorn/lru/LRU.java
index b9ba72121..205b79906 100644
--- a/bundles/org.simantics.acorn/src/org/simantics/acorn/lru/LRU.java
+++ b/bundles/org.simantics.acorn/src/org/simantics/acorn/lru/LRU.java
@@ -293,8 +293,19 @@ public class LRU<MapKey,MapValue extends LRUObject<MapKey, MapValue>> {
 			if(valueToSwap.tryAcquireMutex()) {
 				try {
 					if(valueToSwap.canBePersisted()) {
-						valueToSwap.persist();
-						return true;
+						boolean persist = valueToSwap.persist();
+						if (!persist) {
+							LOGGER.error("\n Somehow valueToSwap {} could not be persisted even though canBePersisted returned true\n", valueToSwap);
+							LOGGER.error("priorityQueue.size() {}", priorityQueue.size());
+							if (priorityQueue.size() > 0) {
+								LOGGER.error("priorityQueue first entry {}", priorityQueue.entrySet().iterator().next());
+							}
+							LOGGER.error("map.size() {}", map.size());
+							if (map.size() > 0) {
+								LOGGER.error("map first entry {}", map.entrySet().iterator().next());
+							}
+						}
+						return persist;
 					}
 				} catch (Throwable t) {
 					throw new IllegalAcornStateException(t);