org.rhq.plugins.script
Class ScriptServerComponent

java.lang.Object
  org.rhq.plugins.script.ScriptServerComponent

All Implemented Interfaces:

AvailabilityFacet, ResourceComponent, MeasurementFacet, OperationFacet

public class ScriptServerComponent
extends Object
implements ResourceComponent, MeasurementFacet, OperationFacet

Represents a managed resource whose management interface is a command line executable or script, sometimes referred to as the "CLI" (command line interface).

Author:

John Mazzitelli

Field Summary

protected static String	METRIC_PROPERTY_ARGUMENTS
protected static String	METRIC_PROPERTY_EXITCODE
protected static String	METRIC_PROPERTY_REGEX
protected static String	OPERATION_PARAM_ARGUMENTS
protected static String	OPERATION_RESULT_EXITCODE
protected static String	OPERATION_RESULT_OUTPUT
protected static String	PLUGINCONFIG_AVAIL_ARGS
protected static String	PLUGINCONFIG_AVAIL_EXECUTE_CHECK
protected static String	PLUGINCONFIG_AVAIL_EXITCODE_REGEX
protected static String	PLUGINCONFIG_AVAIL_OUTPUT_REGEX
protected static String	PLUGINCONFIG_DESC_ARGS
protected static String	PLUGINCONFIG_DESC_REGEX
protected static String	PLUGINCONFIG_ENVVAR_NAME
protected static String	PLUGINCONFIG_ENVVAR_VALUE
protected static String	PLUGINCONFIG_ENVVARS
protected static String	PLUGINCONFIG_EXECUTABLE
protected static String	PLUGINCONFIG_FIXED_DESC
protected static String	PLUGINCONFIG_FIXED_VERSION
protected static String	PLUGINCONFIG_VERSION_ARGS
protected static String	PLUGINCONFIG_VERSION_REGEX
protected static String	PLUGINCONFIG_WORKINGDIR

Constructor Summary

ScriptServerComponent()

Method Summary

protected ProcessExecutionResults	executeExecutable(String args, long wait, boolean captureOutput) Executes the CLI executable with the given arguments.
protected static ProcessExecutionResults	executeExecutable(SystemInfo sysInfo, Configuration pluginConfig, String args, long wait, boolean captureOutput)
AvailabilityType	getAvailability()
protected ResourceContext	getResourcContext()
void	getValues(MeasurementReport report, Set<MeasurementScheduleRequest> requests) Executes the CLI and based on the measurement property, collects the appropriate measurement value.
OperationResult	invokeOperation(String name, Configuration configuration) Invokes the CLI executable.
protected Map<String,String>	parseMetricProperty(String metricPropertyName) Given a metric property name, this parses it into its different pieces and returns a map of the different tokens.
void	start(ResourceContext context)
void	stop()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

PLUGINCONFIG_EXECUTABLE

protected static final String PLUGINCONFIG_EXECUTABLE

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Constant Field Values

PLUGINCONFIG_WORKINGDIR

protected static final String PLUGINCONFIG_WORKINGDIR

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Constant Field Values

PLUGINCONFIG_ENVVARS

protected static final String PLUGINCONFIG_ENVVARS

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Constant Field Values

PLUGINCONFIG_ENVVAR_NAME

protected static final String PLUGINCONFIG_ENVVAR_NAME

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Constant Field Values

PLUGINCONFIG_ENVVAR_VALUE

protected static final String PLUGINCONFIG_ENVVAR_VALUE

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Constant Field Values

PLUGINCONFIG_AVAIL_EXECUTE_CHECK

protected static final String PLUGINCONFIG_AVAIL_EXECUTE_CHECK

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Constant Field Values

PLUGINCONFIG_AVAIL_EXITCODE_REGEX

protected static final String PLUGINCONFIG_AVAIL_EXITCODE_REGEX

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Constant Field Values

PLUGINCONFIG_AVAIL_OUTPUT_REGEX

protected static final String PLUGINCONFIG_AVAIL_OUTPUT_REGEX

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Constant Field Values

PLUGINCONFIG_AVAIL_ARGS

protected static final String PLUGINCONFIG_AVAIL_ARGS

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Constant Field Values

PLUGINCONFIG_VERSION_ARGS

protected static final String PLUGINCONFIG_VERSION_ARGS

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Constant Field Values

PLUGINCONFIG_VERSION_REGEX

protected static final String PLUGINCONFIG_VERSION_REGEX

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Constant Field Values

PLUGINCONFIG_FIXED_VERSION

protected static final String PLUGINCONFIG_FIXED_VERSION

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Constant Field Values

PLUGINCONFIG_DESC_ARGS

protected static final String PLUGINCONFIG_DESC_ARGS

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Constant Field Values

PLUGINCONFIG_DESC_REGEX

protected static final String PLUGINCONFIG_DESC_REGEX

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Constant Field Values

PLUGINCONFIG_FIXED_DESC

protected static final String PLUGINCONFIG_FIXED_DESC

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Constant Field Values

OPERATION_PARAM_ARGUMENTS

protected static final String OPERATION_PARAM_ARGUMENTS

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Constant Field Values

OPERATION_RESULT_EXITCODE

protected static final String OPERATION_RESULT_EXITCODE

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Constant Field Values

OPERATION_RESULT_OUTPUT

protected static final String OPERATION_RESULT_OUTPUT

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Constant Field Values

METRIC_PROPERTY_ARGUMENTS

protected static final String METRIC_PROPERTY_ARGUMENTS

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Constant Field Values

METRIC_PROPERTY_REGEX

protected static final String METRIC_PROPERTY_REGEX

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Constant Field Values

METRIC_PROPERTY_EXITCODE

protected static final String METRIC_PROPERTY_EXITCODE

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Constant Field Values

Constructor Detail

ScriptServerComponent

public ScriptServerComponent()

Method Detail

start

public void start(ResourceContext context)

Specified by:

start in interface ResourceComponent

stop

public void stop()

Specified by:

stop in interface ResourceComponent

getAvailability

public AvailabilityType getAvailability()

Specified by:

getAvailability in interface AvailabilityFacet

getValues

public void getValues(MeasurementReport report,
                      Set<MeasurementScheduleRequest> requests)

Executes the CLI and based on the measurement property, collects the appropriate measurement value. This supports measurement data and traits. A metric property can be a string that is assumed the arguments to pass to the CLI. However, if the property is in the form "{arguments}|regex", the arguments are passed to the CLI and the metric value is taken from the regex match. Examples of metric properties:

• "-a --arg2=123" - passes that string as the arguments list, the metric value is the output of the CLI
• "{}|exitcode" - no arguments are passed to the CLI and the metric value is the exit code of the CLI
• "{-a}|[lL]abel(\p{Digit}+)[\r\n]*" - "-a" is the argument passed to the CLI and the metric value is the digits following the label of the output
• "{}|[ABC]+" - no arguments are passed and the value is the output of the CLI assuming it matches the regex
• "{--foobar}|foobar (.*) blah" - passes "--foobar" as the argument and the metric value is the string that matches the regex group

Specified by:

getValues in interface MeasurementFacet

See Also:

MeasurementFacet.getValues(MeasurementReport, Set)

parseMetricProperty

protected Map<String,String> parseMetricProperty(String metricPropertyName)

Given a metric property name, this parses it into its different pieces and returns a map of the different tokens. The format of the metric property one of the following:

 arguments
 {arguments}|regex
 {arguments}|exitcode
 

where "arguments" is the empty or non-empty string of the arguments to pass to the CLI executable, regex is a empty or non-empty regular expresssion string to match the output (if there is a matching group in the regex, its value will be used as the metric value, not the full output of the executable), exitcode is the literal string "exitcode" to indicate that the exit code value is to be used as the metric value.

Parameters:

metricPropertyName - the name of the property in the metric descriptor

Returns:

map containing the pieces that have been parsed out - the keys are either METRIC_PROPERTY_ARGUMENTS or METRIC_PROPERTY_REGEX. The map will be null if the property name is invalid for some reason. A map entry will not exist if it was not specified in the property name.

invokeOperation

public OperationResult invokeOperation(String name,
                                       Configuration configuration)
                                throws Exception

Invokes the CLI executable. User can tell us what arguments to pass to the executable. The result includes the output of the process as well as the exit code.

Specified by:

invokeOperation in interface OperationFacet

Throws:

Exception

See Also:

OperationFacet.invokeOperation(String, Configuration)

getResourcContext

protected ResourceContext getResourcContext()

executeExecutable

protected ProcessExecutionResults executeExecutable(String args,
                                                    long wait,
                                                    boolean captureOutput)
                                             throws InvalidPluginConfigurationException

Executes the CLI executable with the given arguments.

Parameters:

args - the arguments to send to the executable (may be null)

wait - the maximum time in milliseconds to wait for the process to execute; 0 means do not wait

captureOutput - if true, the executables output will be captured and returned

Returns:

the results of the execution

Throws:

InvalidPluginConfigurationException

executeExecutable

protected static ProcessExecutionResults executeExecutable(SystemInfo sysInfo,
                                                           Configuration pluginConfig,
                                                           String args,
                                                           long wait,
                                                           boolean captureOutput)
                                                    throws InvalidPluginConfigurationException

Throws:

InvalidPluginConfigurationException