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/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* 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. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.internal.process;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FilenameFilter;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.util.Properties;
import java.util.Set;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.Query;
import javax.management.QueryExp;
import javax.management.ReflectionException;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import com.gemstone.gemfire.internal.util.IOUtils;
import com.sun.tools.attach.AgentInitializationException;
import com.sun.tools.attach.AgentLoadException;
import com.sun.tools.attach.AttachNotSupportedException;
import com.sun.tools.attach.VirtualMachine;
/**
* Attaches to a local process to control it via JMX.
*
* @author Kirk Lund
* @since 7.0
* @deprecated as of 8.0 please use {@link ControllableProcess} instead
*/
public final class LocalProcessController {
/** Property name for the JMX local connector address (from sun.management.Agent) */
private static final String LOCAL_CONNECTOR_ADDRESS_PROP =
"com.sun.management.jmxremote.localConnectorAddress";
private final int pid;
protected JMXConnector jmxc;
protected MBeanServerConnection server;
/**
* Constructs an instance for controlling a local process.
*
* @param pid process id identifying the process to attach to
*
* @throws IllegalArgumentException if pid is not a positive integer
*/
public LocalProcessController(final int pid) {
if (pid < 1) {
throw new IllegalArgumentException("Invalid pid '" + pid + "' specified");
}
this.pid = pid;
}
/**
* Constructs an instance for controlling a local process.
*
* @param pidFile file containing the pid of the process to attach to
*
* @throws FileNotFoundException if the specified file name is not found within the directory
* @throws IOException if unable to read from the specified file
* @throws IllegalArgumentException if the pid in the pidFile is not a positive integer
* @throws NumberFormatException if the pid file does not contain a parsable integer
*/
public LocalProcessController(final File pidFile) throws IOException {
this(readPid(pidFile));
}
/**
* Constructs an instance for controlling a local process.
*
* @param directory directory containing a file of name pidFileName
* @param pidFilename name of the file containing the pid of the process to attach to
*
* @throws FileNotFoundException if the specified file name is not found within the directory
* @throws IOException if an I/O error occurs
* @throws IllegalArgumentException if the pid in the pidFile is not a positive integer
* @throws IllegalStateException if dir is not an existing directory
* @throws NumberFormatException if the pid file does not contain a parsable integer
*/
public LocalProcessController(final File directory, final String pidFilename) throws IOException {
this(readPid(directory, pidFilename));
}
/**
* Connects to the process and tells it to shut down.
*
* @param namePattern the name pattern of the MBean to use for stopping
* @param pidAttribute the name of the MBean attribute with the process id to compare against
* @param stopMethod the name of the MBean operation to invoke
* @param attributes the names of the MBean attributes to compare with expected values
* @param values the expected values of the specified MBean attributes
*
* @throws ConnectionFailedException if there was a failure to connect to the local JMX connector in the process
* @throws IOException if a communication problem occurred when talking to the MBean server
* @throws MBeanInvocationFailedException if failed to invoke stop on the MBean for any reason
* @throws PidUnavailableException if parsing the pid from the RuntimeMXBean name fails
*/
public void stop(final ObjectName namePattern, final String pidAttribute, final String stopMethod, final String[] attributes, final Object[] values)
throws ConnectionFailedException, IOException, MBeanInvocationFailedException, PidUnavailableException {
invokeOperationOnTargetMBean(namePattern, pidAttribute, stopMethod, attributes, values);
}
/**
* Connects to the process and acquires its status.
*
* @param namePattern the name pattern of the MBean to use for stopping
* @param pidAttribute the name of the MBean attribute with the process id to compare against
* @param statusMethod the name of the MBean operation to invoke
* @param attributes the names of the MBean attributes to compare with expected values
* @param values the expected values of the specified MBean attributes
*
* @return string describing the status of the process
*
* @throws ConnectionFailedException if there was a failure to connect to the local JMX connector in the process
* @throws IOException if a communication problem occurred when talking to the MBean server
* @throws MBeanInvocationFailedException if failed to invoke stop on the MBean for any reason
* @throws PidUnavailableException if parsing the pid from the RuntimeMXBean name fails
*/
public String status(final ObjectName namePattern, final String pidAttribute, final String statusMethod, final String[] attributes, final Object[] values)
throws ConnectionFailedException, IOException, MBeanInvocationFailedException, PidUnavailableException {
return invokeOperationOnTargetMBean(namePattern, pidAttribute, statusMethod, attributes, values).toString();
}
/**
* Connects to the process and use its MBean to stop it.
*
* @param namePattern the name pattern of the MBean to use for stopping
* @param pidAttribute the name of the MBean attribute with the process id to compare against
* @param methodName the name of the MBean operation to invoke
* @param attributes the names of the MBean attributes to compare with expected values
* @param values the expected values of the specified MBean attributes
*
* @throws ConnectionFailedException if there was a failure to connect to the local JMX connector in the process
* @throws IOException if a communication problem occurred when talking to the MBean server
* @throws MBeanInvocationFailedException if failed to invoke stop on the MBean for any reason
* @throws PidUnavailableException if parsing the pid from the RuntimeMXBean name fails
*/
private Object invokeOperationOnTargetMBean(final ObjectName namePattern, final String pidAttribute, final String methodName, final String[] attributes, final Object[] values)
throws ConnectionFailedException, IOException, MBeanInvocationFailedException, PidUnavailableException {
ObjectName objectName = namePattern;
connect();
try {
final QueryExp constraint = buildQueryExp(pidAttribute, attributes, values);
final Set mbeanNames = this.server.queryNames(namePattern, constraint);
if (mbeanNames.isEmpty()) {
throw new MBeanInvocationFailedException("Failed to find mbean matching '"
+ namePattern + "' with attribute '" + pidAttribute + "' of value '" + this.pid + "'");
}
if (mbeanNames.size() > 1) {
throw new MBeanInvocationFailedException("Found more than one mbean matching '"
+ namePattern + "' with attribute '" + pidAttribute + "' of value '" + this.pid + "'");
}
objectName = mbeanNames.iterator().next();
return invoke(objectName, methodName);
} catch (InstanceNotFoundException e) {
throw new MBeanInvocationFailedException("Failed to invoke " + methodName + " on " + objectName, e);
} catch (MBeanException e) {
throw new MBeanInvocationFailedException("Failed to invoke " + methodName + " on " + objectName, e);
} catch (ReflectionException e) {
throw new MBeanInvocationFailedException("Failed to invoke " + methodName + " on " + objectName, e);
} finally {
disconnect();
}
}
/**
* Returns the process id (pid) of the process.
*
* @return the process id (pid) of the process
*/
public int getProcessId() {
return this.pid;
}
/**
* Connects to the JMX agent in the local process.
*
* @throws ConnectionFailedException if there was a failure to connect to the local JMX connector in the process
* @throws IOException if the JDK management agent cannot be found and loaded
*/
void connect() throws ConnectionFailedException, IOException {
try {
final JMXServiceURL jmxUrl = getJMXServiceURL();
this.jmxc = JMXConnectorFactory.connect(jmxUrl);
this.server = this.jmxc.getMBeanServerConnection();
} catch (AttachNotSupportedException e) {
throw new ConnectionFailedException("Failed to connect to process '" + this.pid + "'", e);
}
}
/**
* Disconnects from the JMX agent in the local process.
*/
void disconnect() {
this.server = null;
if (this.jmxc != null) {
try {
this.jmxc.close();
} catch (IOException e) {
// ignore
}
}
this.jmxc = null;
}
/**
* Ensures that the other process identifies itself by the same pid used by
* this stopper to connect to that process. NOT USED EXCEPT IN TEST.
*
* @return true if the pid matches
*
* @throws IllegalStateException if the other process identifies itself by a different pid
* @throws IOException if a communication problem occurred when accessing the MBeanServerConnection
* @throws PidUnavailableException if parsing the pid from the RuntimeMXBean name fails
*/
boolean checkPidMatches() throws IllegalStateException, IOException, PidUnavailableException {
final RuntimeMXBean proxy = ManagementFactory.newPlatformMXBeanProxy(
this.server, ManagementFactory.RUNTIME_MXBEAN_NAME, RuntimeMXBean.class);
final int remotePid = ProcessUtils.identifyPid(proxy.getName());
if (remotePid != this.pid) {
throw new IllegalStateException("Process has different pid '" + remotePid + "' than expected pid '" + this.pid + "'");
} else {
return true;
}
}
/**
* Uses the Attach API to connect to the local process and ensures that it has
* loaded the JMX management agent. The JMXServiceURL identifying the local
* connector address for the JMX agent in the process is returned.
*
* @return the address of the JMX API connector server for connecting to the local process
*
* @throws AttachNotSupportedException if unable to use the Attach API to connect to the process
* @throws IOException if the JDK management agent cannot be found and loaded
*/
private JMXServiceURL getJMXServiceURL() throws AttachNotSupportedException, IOException {
String connectorAddress = null;
final VirtualMachine vm = VirtualMachine.attach(String.valueOf(this.pid));
try {
Properties agentProps = vm.getAgentProperties();
connectorAddress = (String) agentProps.get(LOCAL_CONNECTOR_ADDRESS_PROP);
if (connectorAddress == null) {
// need to load the management-agent and get the address
final String javaHome = vm.getSystemProperties().getProperty("java.home");
// assume java.home is JDK and look in JRE for agent
String managementAgentPath = javaHome + File.separator + "jre"
+ File.separator + "lib" + File.separator + "management-agent.jar";
File managementAgent = new File(managementAgentPath);
if (!managementAgent.exists()) {
// assume java.home is JRE and look in lib for agent
managementAgentPath = javaHome + File.separator + "lib"
+ File.separator + "management-agent.jar";
managementAgent = new File(managementAgentPath);
if (!managementAgent.exists()) {
throw new IOException("JDK management agent not found");
}
}
// attempt to load the management agent
managementAgentPath = managementAgent.getCanonicalPath();
try {
vm.loadAgent(managementAgentPath, "com.sun.management.jmxremote");
} catch (AgentLoadException e) {
IOException ioe = new IOException(e.getMessage());
ioe.initCause(e);
throw ioe;
} catch (AgentInitializationException e) {
IOException ioe = new IOException(e.getMessage());
ioe.initCause(e);
throw ioe;
}
// get the connector address
agentProps = vm.getAgentProperties();
connectorAddress = (String) agentProps.get(LOCAL_CONNECTOR_ADDRESS_PROP);
}
} finally {
vm.detach();
}
if (connectorAddress == null) {
// should never reach here
throw new IOException("Failed to find address to attach to process");
}
return new JMXServiceURL(connectorAddress);
}
/**
* Builds the QueryExp used to identify the target MBean.
*
* @param pidAttribute the name of the MBean attribute with the process id to compare against
* @param attributes the names of additional MBean attributes to compare with expected values
* @param values the expected values of the specified MBean attributes
*
* @return the main QueryExp for matching the target MBean
*/
private QueryExp buildQueryExp(final String pidAttribute, final String[] attributes, final Object[] values) {
final QueryExp optionalAttributes = buildOptionalQueryExp(attributes, values);
QueryExp constraint;
if (optionalAttributes != null) {
constraint = Query.and(optionalAttributes, Query.eq(
Query.attr(pidAttribute),
Query.value(this.pid)));
} else {
constraint = Query.eq(
Query.attr(pidAttribute),
Query.value(this.pid));
}
return constraint;
}
/**
* Builds an optional QueryExp to aid in matching the correct MBean using
* additional attributes with the specified values. Returns null if no
* attributes and values were specified during construction.
*
* @param attributes the names of additional MBean attributes to compare with expected values
* @param values the expected values of the specified MBean attributes
*
* @return optional QueryExp to aid in matching the correct MBean
*/
private QueryExp buildOptionalQueryExp(final String[] attributes, final Object[] values) {
QueryExp queryExp = null;
for (int i = 0; i < attributes.length; i++) {
if (values[i] instanceof Boolean) {
if (queryExp == null) {
queryExp = Query.eq(
Query.attr(attributes[i]),
Query.value(((Boolean) values[i])));
} else {
queryExp = Query.and(queryExp,
Query.eq(Query.attr(attributes[i]),
Query.value(((Boolean) values[i]))));
}
} else if (values[i] instanceof Number) {
if (queryExp == null) {
queryExp = Query.eq(
Query.attr(attributes[i]),
Query.value((Number)values[i]));
} else {
queryExp = Query.and(queryExp,
Query.eq(Query.attr(attributes[i]),
Query.value((Number)values[i])));
}
} else if (values[i] instanceof String) {
if (queryExp == null) {
queryExp = Query.eq(
Query.attr(attributes[i]),
Query.value((String)values[i]));
} else {
queryExp = Query.and(queryExp,
Query.eq(Query.attr(attributes[i]),
Query.value((String)values[i])));
}
}
}
return queryExp;
}
/**
* Invokes an operation on the specified MBean.
*
* @param objectName identifies the MBean
* @param method the name of the operation method invoke
*
* @return the result of invoking the operation on the MBean specified or null
*
* @throws InstanceNotFoundException if the specified MBean is not registered in the MBean server
* @throws IOException if a communication problem occurred when talking to the MBean server
* @throws MBeanException if the MBean operation throws an exception
* @throws ReflectionException if the MBean does not have the specified operation
*/
private Object invoke(final ObjectName objectName, final String method)
throws InstanceNotFoundException, IOException, MBeanException, ReflectionException {
return this.server.invoke(objectName, method, new Object[]{}, new String[]{});
}
/**
* Reads in the pid from the specified file.
*
* @param pidFile the file containing the pid of the process to stop
*
* @return the process id (pid) contained within the pidFile
*
* @throws IllegalArgumentException if the pid in the pidFile is not a positive integer
* @throws IOException if unable to read from the specified file
* @throws NumberFormatException if the pid file does not contain a parsable integer
*/
private static int readPid(final File pidFile) throws IOException {
BufferedReader fileReader = null;
String pidValue = null;
try {
fileReader = new BufferedReader(new FileReader(pidFile));
pidValue = fileReader.readLine();
final int pid = Integer.parseInt(pidValue);
if (pid < 1) {
throw new IllegalArgumentException("Invalid pid '" + pid + "' found in " + pidFile);
}
return pid;
}
catch (NumberFormatException e) {
throw new IllegalArgumentException("Invalid pid '" + pidValue + "' found in " + pidFile);
}
finally {
IOUtils.close(fileReader);
}
}
/**
* Reads in the pid from the named file contained within the specified
* directory.
*
* @param directory directory containing a file of name pidFileName
* @param pidFilename name of the file containing the pid of the process to stop
*
* @return the process id (pid) contained within the pidFile
*
* @throws FileNotFoundException if the specified file name is not found within the directory
* @throws IllegalArgumentException if the pid in the pidFile is not a positive integer
* @throws IllegalStateException if dir is not an existing directory
* @throws IOException if an I/O error occurs
* @throws NumberFormatException if the pid file does not contain a parsable integer
*/
private static int readPid(final File directory, final String pidFilename) throws IOException {
if (!directory.isDirectory() && directory.exists()) {
throw new IllegalArgumentException("Argument '" + directory + "' must be an existing directory!");
}
final File[] files = directory.listFiles(new FilenameFilter() {
@Override
public boolean accept(File file, String filename) {
return filename.equals(pidFilename);
}
});
if (files.length == 0) {
throw new FileNotFoundException("Unable to find PID file '" + pidFilename + "' in directory " + directory);
}
return readPid(files[0]);
}
}