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/*
* 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")
}
}
}
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