JMXSupport (Jikes RVM API)

java.lang.Object
- org.jikesrvm.mm.mminterface.JMXSupport

```
public class JMXSupport
extends Object
```
Provides methods supporting all JMX beans that relate to memory. Functionality for memory management beans generally requires interfacing with MMTk which is why this class belongs to the MMTk-VM interface.
In JMX terms, the Jikes RVM provides only one memory manager (the garbage collector) and several memory pools (each of which corresponds to exactly one MMTk space).
NOTE: Features related to memory usage are currently not implemented.

Field Summary

Fields
Modifier and Type	Field and Description
`private static String[]`	`garbageCollectorNames` We only provide one garbage collector because the choice of garbage collector for the VM is fixed at build time.
`private static int`	`lastMMTkVerbosity` The level of verbosity that was used in MMTk when verbosity was switched off.
`private static String[]`	`memoryManagerNames` The names of all memory managers that are not garbage collectors.
`private static String[]`	`poolNames`
`private static HashMap<String,Integer>`	`pools` Maps a space name to its index in the space array.

Constructor Summary

Constructors
Constructor and Description

JMXSupport()

Constructors
Constructor and Description
`JMXSupport()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static void`	`fullyBootedVM()` Initializes data structures.
`static long`	`getCollectionCount()`
`static long`	`getCollectionTime()`
`static long`	`getComittedBytes(Space space)`
`static String[]`	`getGarbageCollectorNames()`
`static String[]`	`getMemoryManagerNames()`
`static String[]`	`getMemoryManagerNames(String poolName)`
`static int`	`getObjectPendingFinalizationCount()`
`static long`	`getPoolExtent(Space space)`
`static String[]`	`getPoolNames()`
`static long`	`getReservedBytes(Space space)`
`private static Space`	`getSpace(String poolName)`
`static MemoryType`	`getType(String poolName)` Returns non-heap for immortal spaces and heap for non-immortal spaces because objects can be added and remove from non-immortal spaces.
`static MemoryUsage`	`getUsage(boolean immortal)`
`static MemoryUsage`	`getUsage(String poolName)`
`static boolean`	`isMMTkVerbose()`
`static boolean`	`isValid(String poolName)`
`static void`	`setMMTkVerbose(boolean verbose)` Sets the verbosity for MMTk.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - garbageCollectorNames
```
private static final String[] garbageCollectorNames
```
    We only provide one garbage collector because the choice of garbage collector for the VM is fixed at build time.
  - memoryManagerNames
```
private static final String[] memoryManagerNames
```
    The names of all memory managers that are not garbage collectors. All of our memory managers are collectors so this is empty.
  - pools
```
private static HashMap<String,Integer> pools
```
    Maps a space name to its index in the space array.
  - poolNames
```
private static String[] poolNames
```
  - lastMMTkVerbosity
```
private static int lastMMTkVerbosity
```
    The level of verbosity that was used in MMTk when verbosity was switched off. It will be restored when verbosity is switched on again. We can do this because no other part of the system ever switches the verbosity.
- Constructor Detail
  - JMXSupport
```
public JMXSupport()
```
- Method Detail
  - fullyBootedVM
```
public static void fullyBootedVM()
```
    Initializes data structures. This needs to called before the application starts.
  - getGarbageCollectorNames
```
public static String[] getGarbageCollectorNames()
```
  - getMemoryManagerNames
```
public static String[] getMemoryManagerNames()
```
  - getMemoryManagerNames
```
public static String[] getMemoryManagerNames(String poolName)
```
    Parameters:
    
    poolName - the name of the pool
    
    Returns:
    
    the name of the memory manager(s) of the pool (always our single garbage collector, i.e. active plan)
  - getPoolNames
```
public static String[] getPoolNames()
```
  - getType
```
public static MemoryType getType(String poolName)
```
    Returns non-heap for immortal spaces and heap for non-immortal spaces because objects can be added and remove from non-immortal spaces.
    
    Parameters:
    
    poolName - the pool's name
    
    Returns:
    
    the type of the memory pool
  - getSpace
```
private static Space getSpace(String poolName)
```
  - isValid
```
public static boolean isValid(String poolName)
```
    Parameters:
    
    poolName - a memory pool name
    
    Returns:
    
    whether a space with the given name exists
  - getReservedBytes
```
public static long getReservedBytes(Space space)
```
  - getComittedBytes
```
public static long getComittedBytes(Space space)
```
  - getPoolExtent
```
public static long getPoolExtent(Space space)
```
  - getUsage
```
public static MemoryUsage getUsage(boolean immortal)
```
  - getUsage
```
public static MemoryUsage getUsage(String poolName)
```
  - getObjectPendingFinalizationCount
```
public static int getObjectPendingFinalizationCount()
```
  - isMMTkVerbose
```
public static boolean isMMTkVerbose()
```
  - setMMTkVerbose
```
public static void setMMTkVerbose(boolean verbose)
```
    Sets the verbosity for MMTk. Verbosity in MMTk has several levels so this method makes an effort to save the previous verbosity level if possible.
    
    Parameters:
    
    verbose - true if verbosity is to be enabled, false otherwise
  - getCollectionCount
```
public static long getCollectionCount()
```
  - getCollectionTime
```
public static long getCollectionTime()
```

Class JMXSupport

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

garbageCollectorNames

memoryManagerNames

pools

poolNames

lastMMTkVerbosity

Constructor Detail

JMXSupport

Method Detail

fullyBootedVM

getGarbageCollectorNames

getMemoryManagerNames

getMemoryManagerNames

getPoolNames

getType

getSpace

isValid

getReservedBytes

getComittedBytes

getPoolExtent

getUsage

getUsage

getObjectPendingFinalizationCount

isMMTkVerbose

setMMTkVerbose

getCollectionCount

getCollectionTime