From 3352bd58961fa6f5b44bfbd3415eca44a6cdd9af Mon Sep 17 00:00:00 2001
From: Robert Varga <robert.varga@pantheon.tech>
Date: Tue, 1 Dec 2020 14:42:15 +0100
Subject: [PATCH] Fire AbstractPrerequisite listeners as soon as they resolve

We seem to be stuck with listeners not firing, leaving references
which need to be cleared. Ensure we fire phase listeners as soon
as they are satisfied -- repurposing tryApply() for its logical
purpose.

JIRA: YANGTOOLS-1192
Change-Id: I87d1700e2cc80bfa3fbb5be9a8dc938d6fe55c17
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit d70f2e9f13755ea7c3aac1f0c8d8a6b0b0861368)
---
 .../parser/stmt/reactor/ModifierImpl.java     | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/yang/yang-parser-reactor/src/main/java/org/opendaylight/yangtools/yang/parser/stmt/reactor/ModifierImpl.java b/yang/yang-parser-reactor/src/main/java/org/opendaylight/yangtools/yang/parser/stmt/reactor/ModifierImpl.java
index 7327e988af..5edde2ffd8 100644
--- a/yang/yang-parser-reactor/src/main/java/org/opendaylight/yangtools/yang/parser/stmt/reactor/ModifierImpl.java
+++ b/yang/yang-parser-reactor/src/main/java/org/opendaylight/yangtools/yang/parser/stmt/reactor/ModifierImpl.java
@@ -86,12 +86,6 @@ final class ModifierImpl implements ModelActionBuilder {
         action = null;
     }
 
-    private void applyAction() {
-        checkState(!actionApplied);
-        action.apply(ctx);
-        actionApplied = true;
-    }
-
     private <K, C extends StmtContext<?, ?, ?>, N extends StatementNamespace<K, ?, ?>> @NonNull AbstractPrerequisite<C>
             requiresCtxImpl(final StmtContext<?, ?, ?> context, final Class<N> namespace, final K key,
                     final ModelProcessingPhase phase)  {
@@ -147,7 +141,10 @@ final class ModifierImpl implements ModelActionBuilder {
         checkState(action != null, "Action was not defined yet.");
 
         if (removeSatisfied()) {
-            applyAction();
+            if (!actionApplied) {
+                action.apply(ctx);
+                actionApplied = true;
+            }
             return true;
         }
         return false;
@@ -320,7 +317,7 @@ final class ModifierImpl implements ModelActionBuilder {
         @Override
         public boolean phaseFinished(final StatementContextBase<?, ?, ?> context,
                 final ModelProcessingPhase finishedPhase) {
-            return resolvePrereq((C) context);
+            return resolvePrereq((C) context) || tryApply();
         }
     }
 
@@ -349,7 +346,7 @@ final class ModifierImpl implements ModelActionBuilder {
         @Override
         public boolean phaseFinished(final StatementContextBase<?, ?, ?> context,
                 final ModelProcessingPhase finishedPhase) {
-            return resolvePrereq((C) context);
+            return resolvePrereq((C) context) || tryApply();
         }
 
         @Override
@@ -426,7 +423,9 @@ final class ModifierImpl implements ModelActionBuilder {
 
             if (!it.hasNext()) {
                 // Last step: we are done
-                resolvePrereq((C) value);
+                if (resolvePrereq((C) value)) {
+                    tryApply();
+                }
                 return;
             }
 
-- 
2.36.6