Examples of org.rhq.core.system.ProcessInfo

org.rhq.core.system.ProcessInfo

Encapsulates information about a known process.

A few process properties (i.e. PID, command line) will never change during the lifetime of the process and can be read directly with this class accessors. Other process properties (i.e. state, cpu usage) will vary and their values are grouped in {@link ProcessInfoSnapshot} instances.

Operations on static properties of the process must be implemented in the {@link ProcessInfo} type. Operations onnon static properties must be implemented in the {@link ProcessInfoSnapshot} type. The {@link ProcessInfoSnapshot}subtype has been created to remind users of the class that they are working with cached data.

For example, if you want to be sure a process is still alive, you should use this code:
processInfo.freshSnapshot().isRunning()

Rather than:
processInfo.priorSnapshot().isRunning()
@author John Mazzitelli @author Ian Springer @author Thomas Segismont

     * or got refreshed in order to determine if the process was still running.
     *
     * @return information on the resource's process, or null if process was not found
     */
    public ProcessInfo getNativeProcess() {
        ProcessInfo processInfo = null;


        synchronized (trackedProcesses) {
            //right, we've entered the critical section...
            //we might have waited for another thread to actually fill in the tracked processes
            //so let's check again if we really need to run the discovery

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        String operand1 = null;
        String operand2 = criteria.getValue();


        for (ProcessInfo process : getProcesses()) {
            ProcessInfo processToMatch; // will be the same as process unless the parent qualifier was provided


            if (qualifier.equals(Qualifier.parent)) {
                processToMatch = getParentProcess(process);
            } else {
                processToMatch = process;
            }


            String[] cmdline = (processToMatch != null) ? processToMatch.getCommandLine() : null;


            if ((cmdline == null) || (cmdline.length == 0)) {
                continue; // no sense continuing with this process - there are no command line arguments
            }

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        String operand2;


        String pidfileContentsCache = null; // so we avoid reading the file over and over again


        for (ProcessInfo process : getProcesses()) {
            ProcessInfo processToMatch; // will be the same as process unless the parent qualifier was provided


            if (qualifier.equals(Qualifier.parent)) {
                processToMatch = getParentProcess(process);
            } else {
                processToMatch = process;
            }


            if (attribute.getAttributeValue().equals(Attribute.ProcessCategoryAttributes.name.toString())) {
                operand1 = (processToMatch != null) ? processToMatch.getName() : "";
                operand2 = criteria.getValue();
            } else if (attribute.getAttributeValue().equals(Attribute.ProcessCategoryAttributes.basename.toString())) {
                operand1 = (processToMatch != null) ? processToMatch.getBaseName() : "";
                operand2 = criteria.getValue();
            } else if (attribute.getAttributeValue().equals(Attribute.ProcessCategoryAttributes.pid.toString())) {
                operand1 = (processToMatch != null) ? Long.toString(processToMatch.getPid()) : "";
                operand2 = criteria.getValue();
            } else if (attribute.getAttributeValue().equals(Attribute.ProcessCategoryAttributes.pidfile.toString())) {
                if (pidfileContentsCache == null) {
                    pidfileContentsCache = getPidfileContents(criteria.getValue());
                }


                operand1 = (processToMatch != null) ? String.valueOf(processToMatch.getPid()) : null;
                operand2 = pidfileContentsCache;
            } else {
                throw new IllegalArgumentException(
                    "Criteria with 'process' category must have an attribute of either 'name' or 'basename': "
                        + criteria);

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     * @param  child
     *
     * @return the child's parent process or <code>null</code> if the child has no parent
     */
    private ProcessInfo getParentProcess(ProcessInfo child) {
        ProcessInfo parent = null;


        if (child != null) {
            parent = this.allProcesses.get(child.getParentPid());
        }

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            LOG.debug("Invoked operation '" + operation + "' on " + resourceContext.getResourceKey() + " (waiting for "
                + desiredState + "), attempt " + i + ": " + res.getComplexResults().getMap().toString());


            //wait for max 30s for the operation to "express" itself
            int w = 0;
            ProcessInfo pi;
            while (w < 30) {
                pi = getResourceContext().getNativeProcess();


                switch (desiredState) {
                case RUNNING:
                    if (pi != null && pi.isRunning()) {
                        return;
                    }
                    break;
                case STOPPED:
                    if (pi == null || !pi.isRunning()) {
                        return;
                    }
                }


                Thread.sleep(1000);

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    @Override
    public Configuration loadResourceConfiguration() throws Exception {
        Configuration config = new Configuration();
        
        ProcessInfo pinfo = context.getNativeProcess();
        
        int pid = pinfo == null ? 0 : (int) context.getNativeProcess().getPid();


        LOG.debug("PID = " + pid);

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            throw new IllegalStateException("Only a single test process is expected but there are " + context.getAutoDiscoveredProcesses().size());
        }


        TestComponent.DISCOVERY_CALLS_COUNT.incrementAndGet();
                
        ProcessInfo pinfo = context.getAutoDiscoveredProcesses().get(0).getProcessInfo();
        return Collections.singleton(new DiscoveredResourceDetails(context.getResourceType(), "KEY", "NAME", "VERSION", null, context.getDefaultPluginConfiguration(), pinfo));
    }

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    /**
     * Tests querying technique that is kind of like the one used when we need to autodiscovery Apache.
     */
    public void testPIQLApacheUseCase() {
        ProcessInfo p100 = buildProcessInfo(100, "$1", "--dollararg");
        ProcessInfo p101 = buildProcessInfo(101, 100, "/dollar", "--dollararg");
        ProcessInfo p102 = buildProcessInfo(102, 100, "/dollar", "--dollararg");
        ProcessInfo p200 = buildProcessInfo(200, "/dollar", "--dollararg");
        ProcessInfo p201 = buildProcessInfo(201, 200, "/dollar", "--dollararg");
        ProcessInfo p202 = buildProcessInfo(202, 200, "/dollar", "--dollararg");


        List<ProcessInfo> processes = query.getProcesses();
        processes.add(p100);
        processes.add(p101);
        processes.add(p102);

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        return stopNode();
    }


    protected OperationResult stopNode() {
        ProcessInfo process = getResourceContext().getNativeProcess();


        if (process == null) {
            log.warn("Failed to obtain process info. It appears Cassandra is already shutdown.");
            return new OperationResult("Failed to obtain process info. It appears Cassandra is already shutdown.");
        }


        long pid = process.getPid();
        try {
            process.kill("KILL");


            Configuration pluginConfig = getResourceContext().getPluginConfiguration();
            File basedir = new File(pluginConfig.getSimpleValue("baseDir"));
            File binDir = new File(basedir, "bin");
            File pidFile = new File(binDir, "cassandra.pid");

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        String jmxPort = null;
        StringBuilder commandLineBuilder = new StringBuilder(400);
        int classpathIndex = -1;


        ProcessInfo processInfo = processScanResult.getProcessInfo();
        String[] arguments = processInfo.getCommandLine();
        for (int i = 0; i < arguments.length; i++) {
            String arg = arguments[i];


            if (arg.startsWith("-Dcom.sun.management.jmxremote.port")) {
                String[] jmxPortArg = arg.split("=");
                jmxPort = jmxPortArg[1];
            }
            if (arg.startsWith("-cp") || (arg.startsWith("-classpath"))) {
                classpathIndex = i;
            }


            commandLineBuilder.append(arg);
            commandLineBuilder.append(' ');
        }


        pluginConfig.put(new PropertySimple(COMMAND_LINE_CONFIG_PROPERTY, commandLineBuilder.toString()));


        if (classpathIndex != -1 && classpathIndex + 1 < arguments.length) {
            String[] classpathEntries = arguments[classpathIndex + 1].split(File.pathSeparator);


            File yamlConfigurationPath = null;
            for (String classpathEntry : classpathEntries) {
                if (classpathEntry.endsWith("conf")) {
                    yamlConfigurationPath = new File(classpathEntry);
                    if (!yamlConfigurationPath.isAbsolute()) {
                        try {
                            //relative path, use process CWD to find absolute path of the conf directory
                            yamlConfigurationPath = new File(processInfo.getExecutable().getCwd(), classpathEntry);
                        } catch (Exception e) {
                            log.error("Error creating path for yaml file.", e);
                        }
                    }
                }
            }


            if (yamlConfigurationPath != null) {
                File yamlConfigurationFile = new File(yamlConfigurationPath, "cassandra.yaml");
                ConfigEditor yamlEditor = new ConfigEditor(yamlConfigurationFile);
                yamlEditor.load();


                pluginConfig.put(new PropertySimple(YAML_PROPERTY, yamlConfigurationFile.getAbsolutePath()));
                pluginConfig.put(new PropertySimple(CLUSTER_NAME_PROPERTY, yamlEditor.getClusterName()));
                pluginConfig.put(new PropertySimple(HOST_PROPERTY, yamlEditor.getListenAddress()));
                pluginConfig.put(new PropertySimple(AUTHENTICATOR_PROPERTY, yamlEditor.getAuthenticator()));
            }
        }


        if (jmxPort != null) {
            pluginConfig.put(new PropertySimple(JMX_PORT_PROPERTY, jmxPort));


            pluginConfig.put(new PropertySimple(JMXDiscoveryComponent.CONNECTION_TYPE,
                J2SE5ConnectionTypeDescriptor.class.getName()));
            pluginConfig.put(new PropertySimple(JMXDiscoveryComponent.CONNECTOR_ADDRESS_CONFIG_PROPERTY,
                "service:jmx:rmi:///jndi/rmi://" + pluginConfig.getSimpleValue(HOST_PROPERTY) + ":" + jmxPort
                    + "/jmxrmi"));
        }


        String resourceKey = "Cassandra (" + pluginConfig.getSimpleValue(HOST_PROPERTY) + ") " + jmxPort;
        String resourceName = RESOURCE_NAME;


        String path = processInfo.getExecutable().getCwd();
        pluginConfig.put(new PropertySimple(BASEDIR_PROPERTY, new File(path).getParentFile().getAbsolutePath()));


        return new DiscoveredResourceDetails(context.getResourceType(), resourceKey, resourceName, null, null,
            pluginConfig, processInfo);
    }

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