| /* |
| * 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.ignite.tensorflow.core.util; |
| |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Future; |
| import org.apache.ignite.Ignite; |
| import org.apache.ignite.IgniteLogger; |
| |
| /** |
| * Asynchronous native process runner. |
| */ |
| public abstract class AsyncNativeProcessRunner { |
| /** Ignite logger. */ |
| private final IgniteLogger log; |
| |
| /** Executors that is used to start async native process. */ |
| private final ExecutorService executor; |
| |
| /** Future of the async process process. */ |
| private Future<?> fut; |
| |
| /** |
| * Constructs a new asynchronous native process runner. |
| * |
| * @param ignite Ignite instance. |
| * @param executor Executor. |
| */ |
| public AsyncNativeProcessRunner(Ignite ignite, ExecutorService executor) { |
| this.log = ignite.log().getLogger(AsyncNativeProcessRunner.class); |
| this.executor = executor; |
| } |
| |
| /** |
| * Method that should be called before starting the process. |
| * |
| * @return Prepared native process runner. |
| */ |
| public abstract NativeProcessRunner doBefore(); |
| |
| /** |
| * Method that should be called after starting the process. |
| */ |
| public abstract void doAfter(); |
| |
| /** |
| * Starts the process in separate thread. |
| */ |
| public synchronized void start() { |
| if (fut != null) |
| throw new IllegalStateException("Async native process has already been started"); |
| |
| NativeProcessRunner procRunner = doBefore(); |
| |
| fut = executor.submit(() -> { |
| try { |
| log.debug("Starting native process"); |
| procRunner.startAndWait(); |
| log.debug("Native process completed"); |
| } |
| catch (InterruptedException e) { |
| log.debug("Native process interrupted"); |
| } |
| catch (Exception e) { |
| log.error("Native process failed", e); |
| throw e; |
| } |
| finally { |
| doAfter(); |
| } |
| }); |
| } |
| |
| /** |
| * Stops the process. |
| */ |
| public synchronized void stop() { |
| if (fut != null && !fut.isDone()) |
| fut.cancel(true); |
| } |
| |
| /** |
| * Checks if process is already completed. |
| * |
| * @return {@code true} if process completed, otherwise {@code false}. |
| */ |
| public boolean isCompleted() { |
| return fut != null && fut.isDone(); |
| } |
| |
| /** |
| * Returns an exception that happened during execution or {@code null} if there is no exception. |
| * |
| * @return Exception that happened during execution or {@code null} if there is no exception. |
| */ |
| public Exception getException() { |
| if (!fut.isDone()) |
| return null; |
| |
| try { |
| fut.get(); |
| } |
| catch (InterruptedException | ExecutionException e) { |
| return e; |
| } |
| |
| return null; |
| } |
| } |