From c4377bd039acb4d96ca93356699a685f91479a27 Mon Sep 17 00:00:00 2001
From: Igor Fedorenko
Date: Tue, 9 Apr 2013 23:00:58 -0400
Subject: 405090 fixed plugin artifact cache does not honour forceUpdate

This seems to be a bug in maven core, where DefaultPluginArtifactsCache
and/or DefaultProjectBuildingHelper do not respect session force
dependency update flag. For now, made the fix m2e-specific but
should probably fix in maven.

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
---
 .../embedder/DefaultMavenComponentContributor.java |  3 ++
 .../project/EclipsePluginArtifactsCache.java       | 53 ++++++++++++++++++++++
 2 files changed, 56 insertions(+)
 create mode 100644 org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/project/EclipsePluginArtifactsCache.java

diff --git a/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/embedder/DefaultMavenComponentContributor.java b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/embedder/DefaultMavenComponentContributor.java
index 36a600f2..7eeaa05a 100644
--- a/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/embedder/DefaultMavenComponentContributor.java
+++ b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/embedder/DefaultMavenComponentContributor.java
@@ -12,6 +12,7 @@
 package org.eclipse.m2e.core.internal.embedder;
 
 import org.apache.maven.classrealm.ClassRealmManagerDelegate;
+import org.apache.maven.plugin.PluginArtifactsCache;
 import org.apache.maven.plugin.internal.PluginDependenciesResolver;
 import org.apache.maven.project.artifact.MavenMetadataCache;
 
@@ -19,6 +20,7 @@ import org.sonatype.aether.RepositoryListener;
 import org.sonatype.plexus.build.incremental.BuildContext;
 
 import org.eclipse.m2e.core.internal.project.EclipseMavenMetadataCache;
+import org.eclipse.m2e.core.internal.project.EclipsePluginArtifactsCache;
 import org.eclipse.m2e.core.internal.project.registry.EclipsePluginDependenciesResolver;
 
 
@@ -26,6 +28,7 @@ public class DefaultMavenComponentContributor implements IMavenComponentContribu
 
   public void contribute(IMavenComponentBinder binder) {
     binder.bind(MavenMetadataCache.class, EclipseMavenMetadataCache.class, null);
+    binder.bind(PluginArtifactsCache.class, EclipsePluginArtifactsCache.class, null);
     binder.bind(PluginDependenciesResolver.class, EclipsePluginDependenciesResolver.class, null);
     binder.bind(BuildContext.class, EclipseBuildContext.class, null);
     binder.bind(ClassRealmManagerDelegate.class, EclipseClassRealmManagerDelegate.class,
diff --git a/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/project/EclipsePluginArtifactsCache.java b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/project/EclipsePluginArtifactsCache.java
new file mode 100644
index 00000000..2612679e
--- /dev/null
+++ b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/project/EclipsePluginArtifactsCache.java
@@ -0,0 +1,53 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Igor Fedorenko
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *      Igor Fedorenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.core.internal.project;
+
+import javax.inject.Singleton;
+
+import org.apache.maven.plugin.DefaultPluginArtifactsCache;
+import org.apache.maven.plugin.PluginResolutionException;
+
+import org.sonatype.aether.RepositoryCache;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.RepositoryPolicy;
+
+import org.eclipse.m2e.core.internal.embedder.MavenExecutionContext;
+
+
+@Singleton
+public class EclipsePluginArtifactsCache extends DefaultPluginArtifactsCache {
+
+  public CacheRecord get(Key key) throws PluginResolutionException {
+    MavenExecutionContext context = MavenExecutionContext.getThreadContext();
+
+    if(context == null) {
+      return super.get(key);
+    }
+
+    RepositorySystemSession session = context.getRepositorySession();
+    RepositoryCache sessionCache = session.getCache();
+
+    if(!RepositoryPolicy.UPDATE_POLICY_ALWAYS.equals(session.getUpdatePolicy())
+        || sessionCache.get(session, key) != null) {
+      return super.get(key);
+    }
+
+    // only force refresh once per repository session
+    cache.remove(key);
+    sessionCache.put(session, key, Boolean.TRUE);
+    return null;
+  }
+
+  public EclipsePluginArtifactsCache() {
+    super();
+  }
+}
-- 
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