1 files changed, 75 insertions, 0 deletions
diff --git a/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/cluster/BluePrintClusterExtensions.kt b/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/cluster/BluePrintClusterExtensions.kt
new file mode 100644
index 000000000..edb5bbfe6
--- /dev/null
+++ b/ms/blueprintsprocessor/modules/commons/processor-core/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/core/cluster/BluePrintClusterExtensions.kt
@@ -0,0 +1,75 @@
+/*
+ * Copyright © 2018-2019 AT&T Intellectual Property.
+ *
+ * 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
+
+import com.hazelcast.cluster.Member
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.newSingleThreadContext
+import kotlinx.coroutines.withContext
+import org.onap.ccsdk.cds.blueprintsprocessor.core.service.BluePrintClusterService
+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
+import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintException
+import org.onap.ccsdk.cds.controllerblueprints.core.MDCContext
+import org.onap.ccsdk.cds.controllerblueprints.core.service.BluePrintDependencyService
+
+/**
+ * Exposed Dependency Service by this Hazelcast Lib Module
+ */
+fun BluePrintDependencyService.clusterService(): BluePrintClusterService =
+    instance(HazelcastClusterService::class)
+
+/** Optional Cluster Service, returns only if Cluster is enabled */
+fun BluePrintDependencyService.optionalClusterService(): BluePrintClusterService? {
+    return if (BluePrintConstants.CLUSTER_ENABLED) {
+        BluePrintDependencyService.clusterService()
+    } else null
+}
+
+/** Extension to convert Hazelcast Member to Blueprints Cluster Member */
+fun Member.toClusterMember(): ClusterMember {
+    val memberName: String = this.getAttribute(BluePrintConstants.PROPERTY_CLUSTER_NODE_ID) ?: this.uuid.toString()
+    return ClusterMember(
+        id = this.uuid.toString(),
+        name = memberName,
+        memberAddress = this.address.toString()
+    )
+}
+
+/**
+ * This function will try to acquire the lock and then execute the provided block.
+ * If the lock cannot be acquired within timeout, a BluePrintException will be thrown.
+ *
+ * Since a lock can only be unlocked by the the thread which acquired the lock,
+ * this function will confine coroutines within the block to a dedicated thread.
+ */
+suspend fun <R> ClusterLock.executeWithLock(acquireLockTimeout: Long, block: suspend () -> R): R {
+    val lock = this
+    return newSingleThreadContext(lock.name()).use {
+        withContext(GlobalScope.coroutineContext[MDCContext]?.plus(it) ?: it) {
+            if (lock.tryLock(acquireLockTimeout)) {
+                try {
+                    block()
+                } finally {
+                    lock.unLock()
+                }
+            } else
+                throw BluePrintException("Failed to acquire lock within timeout")
+        }
+    }
+}