exceptionfactory commented on code in PR #6075: URL: https://github.com/apache/nifi/pull/6075#discussion_r892997205
########## minifi/minifi-bootstrap/src/main/java/org/apache/nifi/minifi/bootstrap/command/EnvRunner.java: ########## @@ -0,0 +1,107 @@ +/* + * 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.nifi.minifi.bootstrap.command; + +import static org.apache.nifi.minifi.bootstrap.RunMiNiFi.CMD_LOGGER; +import static org.apache.nifi.minifi.bootstrap.RunMiNiFi.DEFAULT_LOGGER; +import static org.apache.nifi.minifi.bootstrap.Status.ERROR; +import static org.apache.nifi.minifi.bootstrap.Status.MINIFI_NOT_RUNNING; +import static org.apache.nifi.minifi.bootstrap.Status.OK; + +import java.lang.reflect.Method; +import java.util.Map.Entry; +import java.util.Properties; +import org.apache.nifi.minifi.bootstrap.MiNiFiParameters; +import org.apache.nifi.minifi.bootstrap.MiNiFiStatus; +import org.apache.nifi.minifi.bootstrap.service.MiNiFiStatusProvider; + +public class EnvRunner implements CommandRunner { + private final MiNiFiParameters miNiFiParameters; + private final MiNiFiStatusProvider miNiFiStatusProvider; + + public EnvRunner(MiNiFiParameters miNiFiParameters, MiNiFiStatusProvider miNiFiStatusProvider) { + this.miNiFiParameters = miNiFiParameters; + this.miNiFiStatusProvider = miNiFiStatusProvider; + } + + /** + * Returns information about the MiNiFi's virtual machine. + * @param args the input arguments + * @return status code + */ + @Override + public int runCommand(String[] args) { + return env(); + } + + private int env() { + MiNiFiStatus status = miNiFiStatusProvider.getStatus(miNiFiParameters.getMiNiFiPort(), miNiFiParameters.getMinifiPid()); + if (status.getPid() == null) { + CMD_LOGGER.error("Apache MiNiFi is not running"); + return MINIFI_NOT_RUNNING.getStatusCode(); + } + + Class<?> virtualMachineClass; + try { + virtualMachineClass = Class.forName("com.sun.tools.attach.VirtualMachine"); + } catch (ClassNotFoundException cnfe) { + CMD_LOGGER.error("Seems tools.jar (Linux / Windows JDK) or classes.jar (Mac OS) is not available in classpath"); + return ERROR.getStatusCode(); + } + + Method attachMethod; + Method detachMethod; + try { + attachMethod = virtualMachineClass.getMethod("attach", String.class); + detachMethod = virtualMachineClass.getDeclaredMethod("detach"); + } catch (Exception e) { + CMD_LOGGER.error("Methods required for getting environment not available"); + DEFAULT_LOGGER.error("Exception:", e); + return ERROR.getStatusCode(); + } + + Object virtualMachine; + try { + virtualMachine = attachMethod.invoke(null, status.getPid()); + } catch (Exception e) { + CMD_LOGGER.error("Problem attaching to MiNiFi"); + DEFAULT_LOGGER.error("Exception:", e); + return ERROR.getStatusCode(); + } + + try { + Method getSystemPropertiesMethod = virtualMachine.getClass().getMethod("getSystemProperties"); + + Properties sysProps = (Properties) getSystemPropertiesMethod.invoke(virtualMachine); Review Comment: Thanks for the explanation, that makes sense. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
