Fixed NoClassDefFoundError when USE_SCRIPT_COMPILE_CACHE is set to false

USE_SCRIPT_COMPILE_CACHE set to false cleans the Class Loader cache after each kotlin script execution.
When several kotlin script are executed in parallel (ie no dependency between them) and USE_SCRIPT_COMPILE_CACHE=false then
the class loader from the cache may be deleted before one of those executed kotlin script get the time to finish which to the NoClassDefFoundError.

Removed cleanupInstance method for kotlin script executors that where causing the class loader to be removed prematurely.
Now the behaviour is to remove the class loader from the cache only when we publish a new CBA which was already the case when CDS run with a single instance.
In cluster mode, a topic has been added to hazelcast to allow the instance publishing the updated CBA to communicate to the other instances by sending a message to clean the class loader
for this CBA from their cache.

Added mutex on kotlin script compilation to fix race condition. For concurrent kotlin script execution each process wanted to compile an executable but it was causing a race condition if a process tries to execute while another still compile. Mutex on the execution path prevent this behaviour

Issue-ID: CCSDK-3052
Signed-off-by: Julien Fontaine <julien.fontaine@bell.ca>
Signed-off-by: Jozsef Csongvai <jozsef.csongvai@bell.ca>
Change-Id: I6ab002352b3272898ad0b183341ee664652c8ae3

4 files changed, 124 insertions, 1 deletions

diff --git a/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/cluster/BlueprintClusterTopic.kt b/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/cluster/BlueprintClusterTopic.kt
new file mode 100644
index 000000000..090130f98
--- /dev/null
+++ b/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/cluster/BlueprintClusterTopic.kt
@@ -0,0 +1,21 @@
+/*
+ * Copyright © 2020 Bell Canada.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onap.ccsdk.cds.blueprintsprocessor.core.cluster
+
+enum class BlueprintClusterTopic {
+    BLUEPRINT_CLEAN_COMPILER_CACHE
+}
diff --git a/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/cluster/HazelcastClusterService.kt b/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/cluster/HazelcastClusterService.kt
index 5493bac1a..fb9056776 100644
--- a/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/cluster/HazelcastClusterService.kt
+++ b/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/cluster/HazelcastClusterService.kt
@@ -30,9 +30,14 @@ import com.hazelcast.core.HazelcastInstance
 import com.hazelcast.cp.CPSubsystemManagementService
 import com.hazelcast.cp.lock.FencedLock
 import com.hazelcast.scheduledexecutor.IScheduledExecutorService
+import com.hazelcast.topic.Message
+import com.hazelcast.topic.MessageListener
 import kotlinx.coroutines.delay
+import org.onap.ccsdk.cds.blueprintsprocessor.core.service.BluePrintClusterMessage
 import org.onap.ccsdk.cds.blueprintsprocessor.core.service.BluePrintClusterService
+import org.onap.ccsdk.cds.blueprintsprocessor.core.service.BlueprintClusterMessageListener
 import org.onap.ccsdk.cds.blueprintsprocessor.core.service.ClusterInfo
+import org.onap.ccsdk.cds.blueprintsprocessor.core.service.ClusterJoinedEvent
 import org.onap.ccsdk.cds.blueprintsprocessor.core.service.ClusterLock
 import org.onap.ccsdk.cds.blueprintsprocessor.core.service.ClusterMember
 import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintConstants
@@ -40,12 +45,15 @@ import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintProcessorException
 import org.onap.ccsdk.cds.controllerblueprints.core.logger
 import org.onap.ccsdk.cds.controllerblueprints.core.normalizedFile
 import org.onap.ccsdk.cds.controllerblueprints.core.utils.ClusterUtils
+import org.springframework.context.ApplicationEventPublisher
 import org.springframework.stereotype.Service
 import java.time.Duration
+import java.util.UUID
+
 import java.util.concurrent.TimeUnit
 
 @Service
-open class HazelcastClusterService : BluePrintClusterService {
+open class HazelcastClusterService(private val applicationEventPublisher: ApplicationEventPublisher) : BluePrintClusterService {
 
     private val log = logger(HazelcastClusterService::class)
     lateinit var hazelcast: HazelcastInstance
@@ -123,6 +131,7 @@ open class HazelcastClusterService : BluePrintClusterService {
         log.info(
             "Cluster(${hazelcast.config.clusterName}) node(${hazelcast.name}) created successfully...."
         )
+        applicationEventPublisher.publishEvent(ClusterJoinedEvent(this))
     }
 
     override fun isClient(): Boolean {
@@ -184,6 +193,21 @@ open class HazelcastClusterService : BluePrintClusterService {
         }
     }
 
+    override suspend fun <T> sendMessage(topic: BlueprintClusterTopic, message: T) {
+        hazelcast.getReliableTopic<T>(topic.name).publish(message)
+    }
+
+    override fun <T> addBlueprintClusterMessageListener(topic: BlueprintClusterTopic, listener: BlueprintClusterMessageListener<T>): UUID {
+        log.info("Cluster(${hazelcast.config.clusterName}) node(${hazelcast.name}) listening to topic($topic)...")
+        return hazelcast.getReliableTopic<T>(topic.name)
+            .addMessageListener(HazelcastMessageListenerAdapter(listener))
+    }
+
+    override fun removeBlueprintClusterMessageListener(topic: BlueprintClusterTopic, uuid: UUID): Boolean {
+        log.info("Cluster(${hazelcast.config.clusterName}) node(${hazelcast.name}) has stopped listening to topic($topic)...")
+        return hazelcast.getReliableTopic<Any>(topic.name).removeMessageListener(uuid)
+    }
+
     /** Utils */
     suspend fun promoteAsCPMember(hazelcastInstance: HazelcastInstance) {
         if (!joinedClient && !joinedLite) {
@@ -273,3 +297,14 @@ open class ClusterLockImpl(private val hazelcast: HazelcastInstance, private val
     override fun close() {
     }
 }
+
+class HazelcastMessageListenerAdapter<E>(val listener: BlueprintClusterMessageListener<E>) : MessageListener<E> {
+    override fun onMessage(message: Message<E>?) = message?.let {
+        BluePrintClusterMessage<E>(
+            BlueprintClusterTopic.valueOf(it.source as String),
+            it.messageObject,
+            it.publishTime,
+            it.publishingMember.toClusterMember()
+        )
+    }.let { listener.onMessage(it) }
+}
diff --git a/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/listeners/BlueprintCompilerCacheMessageListener.kt b/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/listeners/BlueprintCompilerCacheMessageListener.kt
new file mode 100644
index 000000000..3833379c9
--- /dev/null
+++ b/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/listeners/BlueprintCompilerCacheMessageListener.kt
@@ -0,0 +1,47 @@
+/*
+ * Copyright © 2020 Bell Canada.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onap.ccsdk.cds.blueprintsprocessor.core.listeners
+
+import org.onap.ccsdk.cds.blueprintsprocessor.core.cluster.BlueprintClusterTopic
+import org.onap.ccsdk.cds.blueprintsprocessor.core.service.BluePrintClusterMessage
+import org.onap.ccsdk.cds.blueprintsprocessor.core.service.BluePrintClusterService
+import org.onap.ccsdk.cds.blueprintsprocessor.core.service.BlueprintClusterMessageListener
+import org.onap.ccsdk.cds.blueprintsprocessor.core.service.ClusterJoinedEvent
+import org.onap.ccsdk.cds.controllerblueprints.core.logger
+import org.onap.ccsdk.cds.controllerblueprints.core.scripts.BluePrintCompileCache
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty
+import org.springframework.context.event.EventListener
+import org.springframework.stereotype.Component
+
+@Component
+@ConditionalOnProperty("CLUSTER_ENABLED", havingValue = "true")
+open class BlueprintCompilerCacheMessageListener(private val clusterService: BluePrintClusterService) : BlueprintClusterMessageListener<String> {
+    private val log = logger(BlueprintCompilerCacheMessageListener::class)
+
+    @EventListener(ClusterJoinedEvent::class)
+    fun register() {
+        log.info("Registering BlueprintCompilerCacheMessageListener")
+        clusterService.addBlueprintClusterMessageListener(BlueprintClusterTopic.BLUEPRINT_CLEAN_COMPILER_CACHE, this)
+    }
+
+    override fun onMessage(message: BluePrintClusterMessage<String>?) {
+        message?.let {
+            log.info("Received ClusterMessage - Cleaning compile cache for blueprint (${it.payload})")
+            BluePrintCompileCache.cleanClassLoader(it.payload)
+        }
+    }
+}
diff --git a/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/service/BluePrintClusterService.kt b/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/service/BluePrintClusterService.kt
index 8cb9f4f92..f7ba6f25f 100644
--- a/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/service/BluePrintClusterService.kt
+++ b/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/service/BluePrintClusterService.kt
@@ -16,8 +16,11 @@
 
 package org.onap.ccsdk.cds.blueprintsprocessor.core.service
 
+import org.onap.ccsdk.cds.blueprintsprocessor.core.cluster.BlueprintClusterTopic
+import org.springframework.context.ApplicationEvent
 import java.time.Duration
 import java.util.Properties
+import java.util.UUID
 
 interface BluePrintClusterService {
 
@@ -53,6 +56,15 @@ interface BluePrintClusterService {
 
     /** Shut down the cluster with [duration] */
     suspend fun shutDown(duration: Duration)
+
+    /** Send [message] to the listener(s) of a [topic] */
+    suspend fun <T> sendMessage(topic: BlueprintClusterTopic, message: T)
+
+    /** Register a [listener] to a [topic] and returns his UUID */
+    fun <T> addBlueprintClusterMessageListener(topic: BlueprintClusterTopic, listener: BlueprintClusterMessageListener<T>): UUID
+
+    /** Unregister a listener from a [topic] using his [uuid] and returns true if it succeeded */
+    fun removeBlueprintClusterMessageListener(topic: BlueprintClusterTopic, uuid: UUID): Boolean
 }
 
 data class ClusterInfo(
@@ -83,4 +95,12 @@ interface ClusterLock {
     fun close()
 }
 
+class BluePrintClusterMessage<E>(val topic: BlueprintClusterTopic, val payload: E, publishTime: Long, clusterMember: ClusterMember)
+
+interface BlueprintClusterMessageListener<E> {
+    fun onMessage(message: BluePrintClusterMessage<E>?)
+}
+
+class ClusterJoinedEvent(source: Any) : ApplicationEvent(source)
+
 const val CDS_LOCK_GROUP = "cds-lock"