| /* |
| * 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.lang.management.ManagementFactory; |
| import java.util.Map; |
| import org.apache.ignite.tensorflow.util.SerializableSupplier; |
| |
| /** |
| * Python process builder supplier that is used to create Python process builder. |
| */ |
| public class PythonProcessBuilderSupplier implements SerializableSupplier<ProcessBuilder> { |
| /** */ |
| private static final long serialVersionUID = 7181937306294456125L; |
| |
| /** Python environment variable name. */ |
| private static final String PYTHON_ENV_NAME = "PYTHON"; |
| |
| /** Interactive flag (allows to used standard input to pass Python script). */ |
| private final boolean interactive; |
| |
| /** Meta information that adds to script as arguments. */ |
| private final String[] meta; |
| |
| /** |
| * Constructs a new instance of Python process builder supplier. |
| * |
| * @param interactive Interactive flag (allows to used standard input to pass Python script). |
| * @param meta Meta information that adds to script as arguments. |
| */ |
| public PythonProcessBuilderSupplier(boolean interactive, String... meta) { |
| this.interactive = interactive; |
| this.meta = meta; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public ProcessBuilder get() { |
| String python = System.getenv(PYTHON_ENV_NAME); |
| |
| if (python == null) |
| python = "python3"; |
| |
| ProcessBuilder procBldr; |
| if (interactive) { |
| String[] cmd = new String[meta.length + 3]; |
| |
| cmd[0] = python; |
| cmd[1] = "-i"; |
| cmd[2] = "-"; |
| |
| System.arraycopy(meta, 0, cmd, 3, meta.length); |
| |
| procBldr = new ProcessBuilder(cmd); |
| } |
| else |
| procBldr = new ProcessBuilder(python); |
| |
| Map<String, String> env = procBldr.environment(); |
| env.put("PPID", String.valueOf(getProcessId())); |
| |
| return procBldr; |
| } |
| |
| /** |
| * Returns current process identifier. |
| * |
| * @return Process identifier. |
| */ |
| private long getProcessId() { |
| String pid = ManagementFactory.getRuntimeMXBean().getName().split("@")[0]; |
| |
| return Long.parseLong(pid); |
| } |
| } |