| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.nlpcraft.common.pool |
| |
| import io.opencensus.trace.Span |
| import org.apache.nlpcraft.common._ |
| |
| import java.util.concurrent._ |
| import scala.collection.JavaConverters._ |
| import scala.concurrent.ExecutionContext |
| |
| /** |
| * Common thread pool manager. |
| */ |
| object NCThreadPoolManager extends NCService { |
| /** |
| * Pools that should NOT default to a system context. |
| * TODO: in the future - we may need to open this to user configuration. |
| */ |
| private final val NON_SYS_POOLS = Seq( |
| "probes.communication", |
| "probe.requests", |
| "model.solver.pool" |
| ) |
| |
| private final val KEEP_ALIVE_MS = 60000 |
| private final val POOL_SIZE = Runtime.getRuntime.availableProcessors // Since JDK 10 is safe for containers. |
| |
| @volatile private var cache: ConcurrentHashMap[String, Holder] = _ |
| |
| /** |
| * |
| * @param context |
| * @param pool |
| */ |
| private case class Holder( |
| context: ExecutionContext, |
| pool: Option[ExecutorService] |
| ) |
| |
| /** |
| * |
| * @return |
| */ |
| def getSystemContext: ExecutionContext = ExecutionContext.Implicits.global |
| |
| /** |
| * |
| * @param name |
| * @return |
| */ |
| def getContext(name: String): ExecutionContext = |
| cache.computeIfAbsent( |
| name, |
| (_: String) ⇒ |
| if (NON_SYS_POOLS.contains(name)) { |
| // Create separate executor for these pools... |
| val exec = new ThreadPoolExecutor( |
| 0, |
| POOL_SIZE, |
| KEEP_ALIVE_MS, |
| TimeUnit.MILLISECONDS, |
| new LinkedBlockingQueue[Runnable] |
| ) |
| |
| Holder(ExecutionContext.fromExecutor(exec), Some(exec)) |
| } |
| else |
| throw new NCE(s"Custom execution context for unexpected thread pool: $name") |
| ).context |
| |
| override def start(parent: Span): NCService = startScopedSpan("start", parent) { _ ⇒ |
| ackStarting() |
| |
| cache = new ConcurrentHashMap |
| |
| ackStarted() |
| } |
| |
| override def stop(parent: Span): Unit = startScopedSpan("stop", parent) { _ ⇒ |
| ackStopping() |
| |
| cache.values().asScala.flatMap(_.pool).foreach(U.shutdownPool) |
| cache.clear() |
| |
| cache = null |
| |
| ackStopped() |
| } |
| } |