Module openj9.sharedclasses
Package com.ibm.oti.shared

Class SharedClassStatistics

java.lang.Object
com.ibm.oti.shared.SharedClassStatistics
public class SharedClassStatistics extends Object
SharedClassStatistics provides static functions that report basic cache statistics.

  • Constructor Summary

    Constructors
    Constructor
    Description
    SharedClassStatistics()
    Deprecated.

  • Method Summary

    Modifier and Type
    Method
    Description
    static String
    cacheDir()
    Returns the cache directory.
    static String
    cacheName()
    Returns the cache name.
    static String
    cachePath()
    Returns the full cache path.
    static long
    freeSpaceBytes()
    Returns the free space of the shared cache that the JVM is currently connected to.
    static long
    maxAotBytes()
    Returns the maximum space allowed for AOT data of the cache that the JVM is currently connected to.
    static long
    maxJitDataBytes()
    Returns the maximum space allowed for JIT data of the cache that the JVM is currently connected to.
    static long
    maxSizeBytes()
    Returns the size of the shared cache that the JVM is currently connected to.
    static long
    minAotBytes()
    Returns the minimum space reserved for AOT data of the cache that the JVM is currently connected to.
    static long
    minJitDataBytes()
    Returns the minimum space reserved for JIT data of the cache that the JVM is currently connected to.
    static long
    numberAttached()
    Returns the SysV shmem nattch value for a non-persistent top level cache.
    static long
    softmxBytes()
    Returns the soft limit in bytes for the available space of the cache that the JVM is currently connected to.

    Methods declared in class java.lang.Object

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

  • Constructor Details

    • SharedClassStatistics

      @Deprecated public SharedClassStatistics()
      Deprecated.
      Constructs a new instance of this class.

  • Method Details

    • maxSizeBytes

      public static long maxSizeBytes()
      Returns the size of the shared cache that the JVM is currently connected to.
      Returns:
      the total size in bytes

    • freeSpaceBytes

      public static long freeSpaceBytes()
      Returns the free space of the shared cache that the JVM is currently connected to.
      Returns:
      the free space in bytes

    • softmxBytes

      public static long softmxBytes()
      Returns the soft limit in bytes for the available space of the cache that the JVM is currently connected to.
      Returns:
      the soft max size or cache size in bytes if it is not set

    • minAotBytes

      public static long minAotBytes()
      Returns the minimum space reserved for AOT data of the cache that the JVM is currently connected to.
      Returns:
      the minimum shared classes cache space reserved for AOT data in bytes or -1 if it is not set

    • maxAotBytes

      public static long maxAotBytes()
      Returns the maximum space allowed for AOT data of the cache that the JVM is currently connected to.
      Returns:
      the maximum shared classes cache space allowed for AOT data in bytes or -1 if it is not set

    • minJitDataBytes

      public static long minJitDataBytes()
      Returns the minimum space reserved for JIT data of the cache that the JVM is currently connected to.
      Returns:
      the minimum shared classes cache space reserved for JIT data in bytes or -1 if it is not set

    • maxJitDataBytes

      public static long maxJitDataBytes()
      Returns the maximum space allowed for JIT data of the cache that the JVM is currently connected to.
      Returns:
      the maximum shared classes cache space allowed for JIT data in bytes or -1 if it is not set

    • numberAttached

      public static long numberAttached()
      Returns the SysV shmem nattch value for a non-persistent top level cache.

      On Windows or for persistent caches, -1 is returned. Depending on the platform and OS, such as z/OS, the value indicates the number of JVMs attached to the cache.

      Returns:
      the SysV shmem nattch value for a top level non-persistent cache, or -1 if it cannot be determined

    • cachePath

      public static String cachePath()
      Returns the full cache path.
      Returns:
      the full cache path, or NULL if it cannot be determined

    • cacheName

      public static String cacheName()
      Returns the cache name.
      Returns:
      the cache name, or NULL if it cannot be determined

    • cacheDir

      public static String cacheDir()
      Returns the cache directory.
      Returns:
      the cache directory, or NULL if it cannot be determined