OpenJDK 1.23 · sun.jvmstat.perfdata.monitor.AbstractPerfDataBuffer

Modifier and Type	Field and Description
protected PerfDataBufferImpl	impl Reference to the concrete instance created by the `createPerfDataBuffer` method.

Access	Constructor and Description
public	AbstractPerfDataBuffer()

Method Summary

Modifier and Type	Method and Description
protected void	createPerfDataBuffer(ByteBuffer the ByteBuffer that references the instrumentation data. bb, int the Local Java Virtual Machine identifier for this instrumentation buffer. lvmid) Create the perfdata instrumentation buffer for the given lvmid using the given ByteBuffer object as the source of the instrumentation data.
public Monitor	Returns: Monitor - the `Monitor` object that can be used to monitor the named instrumentation object, or `null` if the named object doesn't exist. findByName(String the name of the Instrumentation object to find. name) Find a named Instrumentation object.
public List<Monitor>	Returns: `List<Monitor>` - a List of `Monitor` objects that can be used to monitor the instrumentation objects whose names match the given pattern. If no instrumentation objects have` names matching the given pattern, then an empty List is returned. findByPattern(String a string containing a pattern as described in `java.util.regex.Pattern`. patternString) Find all Instrumentation objects with names matching the given pattern.
public ByteBuffer	Returns: ByteBuffer - a ByteBuffer object that refers to the instrumentation data. getByteBuffer() Get the ByteBuffer containing the instrumentation data.
public byte[]	Returns: byte[] - a copy of the bytes in the instrumentation buffer. getBytes() Get a copy of the raw instrumentation data.
public int	Returns: int - the capacity, or size, of the instrumentation buffer. getCapacity() Get the capacity of the instrumentation buffer.
public int	Returns: int - the lvmid getLocalVmId() Get the Local Java Virtual Machine Identifier, or lvmid for the target JVM associated with this instrumentation buffer.
public MonitorStatus	Returns: MonitorStatus - the status of available Monitors for the target Java Virtual Machine. getMonitorStatus() Get a list of the inserted and removed monitors since last called.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

impl	back to summary
protected PerfDataBufferImpl impl Reference to the concrete instance created by the `createPerfDataBuffer` method.

AbstractPerfDataBuffer	back to summary
public AbstractPerfDataBuffer()

Method Detail

createPerfDataBuffer	back to summary
protected void createPerfDataBuffer(ByteBuffer bb, int lvmid) throws MonitorException Create the perfdata instrumentation buffer for the given lvmid using the given ByteBuffer object as the source of the instrumentation data. This method parses the instrumentation buffer header to determine key characteristics of the instrumentation buffer and then dynamically loads the appropriate class to handle the particular instrumentation version. Parameters bb:ByteBuffer the ByteBuffer that references the instrumentation data. lvmid:int the Local Java Virtual Machine identifier for this instrumentation buffer.

createPerfDataBuffer

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protected void createPerfDataBuffer(ByteBuffer bb, int lvmid) throws MonitorException

Create the perfdata instrumentation buffer for the given lvmid using the given ByteBuffer object as the source of the instrumentation data. This method parses the instrumentation buffer header to determine key characteristics of the instrumentation buffer and then dynamically loads the appropriate class to handle the particular instrumentation version.

Parameters

bb:ByteBuffer: the ByteBuffer that references the instrumentation data.
lvmid:int: the Local Java Virtual Machine identifier for this instrumentation buffer.

findByName back to summary

findByName	back to summary
public Monitor findByName(String name) throws MonitorException Find a named Instrumentation object. This method will look for the named instrumentation object in the instrumentation exported by this Java Virtual Machine. If an instrumentation object with the given name exists, a Monitor interface to that object will be return. Otherwise, the method returns `null`. Parameters name:String the name of the Instrumentation object to find. Returns:Monitor Monitor - the `Monitor` object that can be used to monitor the named instrumentation object, or `null` if the named object doesn't exist. Exceptions MonitorException: Thrown if an error occurs while communicating with the target Java Virtual Machine.

public Monitor findByName(String name) throws MonitorException

Find a named Instrumentation object. This method will look for the named instrumentation object in the instrumentation exported by this Java Virtual Machine. If an instrumentation object with the given name exists, a Monitor interface to that object will be return. Otherwise, the method returns null.

Parameters

name:String: the name of the Instrumentation object to find.

Returns:Monitor

Monitor - the Monitor object that can be used to monitor the named instrumentation object, or null if the named object doesn't exist.

Exceptions

MonitorException:: Thrown if an error occurs while communicating with the target Java Virtual Machine.

findByPattern back to summary

findByPattern	back to summary
public List<Monitor> findByPattern(String patternString) throws MonitorException Find all Instrumentation objects with names matching the given pattern. This method returns a `List` of Monitor objects such that the name of each object matches the given pattern. Parameters patternString:String a string containing a pattern as described in `java.util.regex.Pattern`. Returns:List<Monitor> `List<Monitor>` - a List of `Monitor` objects that can be used to monitor the instrumentation objects whose names match the given pattern. If no instrumentation objects have` names matching the given pattern, then an empty List is returned. Exceptions MonitorException: Thrown if an error occurs while communicating with the target Java Virtual Machine. See Also `java.util.regex.Pattern`

public List<Monitor> findByPattern(String patternString) throws MonitorException

Find all Instrumentation objects with names matching the given pattern. This method returns a List of Monitor objects such that the name of each object matches the given pattern.

Parameters

patternString:String: a string containing a pattern as described in java.util.regex.Pattern.

Returns:List<Monitor>

List<Monitor> - a List of Monitor objects that can be used to monitor the instrumentation objects whose names match the given pattern. If no instrumentation objects have` names matching the given pattern, then an empty List is returned.

Exceptions

MonitorException:: Thrown if an error occurs while communicating with the target Java Virtual Machine.

See Also

java.util.regex.Pattern

getByteBuffer	back to summary
public ByteBuffer getByteBuffer() Get the ByteBuffer containing the instrumentation data. Returns:ByteBuffer ByteBuffer - a ByteBuffer object that refers to the instrumentation data.

getByteBuffer

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public ByteBuffer getByteBuffer()

Get the ByteBuffer containing the instrumentation data.

Returns:ByteBuffer: ByteBuffer - a ByteBuffer object that refers to the instrumentation data.

getBytes	back to summary
public byte[] getBytes() Get a copy of the raw instrumentation data. This method is used to get a copy of the current bytes in the instrumentation buffer. It is generally used for transporting those bytes over the network. Returns:byte[] byte[] - a copy of the bytes in the instrumentation buffer.

getBytes

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public byte[] getBytes()

Get a copy of the raw instrumentation data. This method is used to get a copy of the current bytes in the instrumentation buffer. It is generally used for transporting those bytes over the network.

Returns:byte[]: byte[] - a copy of the bytes in the instrumentation buffer.

getCapacity	back to summary
public int getCapacity() Get the capacity of the instrumentation buffer. Returns:int int - the capacity, or size, of the instrumentation buffer.

getCapacity

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public int getCapacity()

Get the capacity of the instrumentation buffer.

Returns:int: int - the capacity, or size, of the instrumentation buffer.

getLocalVmId	back to summary
public int getLocalVmId() Get the Local Java Virtual Machine Identifier, or lvmid for the target JVM associated with this instrumentation buffer. Returns:int int - the lvmid

getLocalVmId

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public int getLocalVmId()

Get the Local Java Virtual Machine Identifier, or lvmid for the target JVM associated with this instrumentation buffer.

Returns:int: int - the lvmid

getMonitorStatus	back to summary
public MonitorStatus getMonitorStatus() throws MonitorException Get a list of the inserted and removed monitors since last called. Returns:MonitorStatus MonitorStatus - the status of available Monitors for the target Java Virtual Machine. Exceptions MonitorException: Thrown if communications errors occur while communicating with the target.

getMonitorStatus

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public MonitorStatus getMonitorStatus() throws MonitorException

Get a list of the inserted and removed monitors since last called.

Returns:MonitorStatus

MonitorStatus - the status of available Monitors for the target Java Virtual Machine.

Exceptions

MonitorException:: Thrown if communications errors occur while communicating with the target.

public abstract Class AbstractPerfDataBuffer

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Constructor Summary

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Field Detail

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Method Detail