MemberIdStrongCache< C > Struct Template Reference

#include <jtie_tconv_idcache_impl.hpp>

Inheritance diagram for MemberIdStrongCache< C >:

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Public Types
typedef MemberId< C >	A
typedef MemberIdCache< C >	Base
Public Types inherited from MemberIdCache< C >
typedef C::memberID_t	ID_t
Public Types inherited from MemberId< C >
typedef C::memberID_t	ID_t

Static Public Member Functions
static void	setClass (JNIEnv *env, jclass cls)
static jclass	getClass (JNIEnv *env)
static void	releaseRef (JNIEnv *env, jclass cls)
Static Public Member Functions inherited from MemberIdCache< C >
static ID_t	getId (JNIEnv *env, jclass cls)

Additional Inherited Members
Static Public Attributes inherited from MemberId< C >
static unsigned long	nIdLookUps = 0
Static Protected Attributes inherited from MemberIdCache< C >
static jclass	gClassRef = NULL
static ID_t	mid = NULL

Detailed Description

template<typename C>
struct MemberIdStrongCache< C >

Provides caching of JNI Field/Method IDs using strong class references, preventing classes from being unloaded even if no longer used by Java code.

Definition at line 330 of file jtie_tconv_idcache_impl.hpp.

Member Function Documentation

template<typename C >

static jclass MemberIdStrongCache< C >::getClass ( JNIEnv *  env )

inlinestatic

Returns a JNI Reference to the class declaring the member specified by info type 'C'.

Depending upon the underlying caching strategy, a returned reference may be local or global, weak or strong; the scope of its use must be demarcated by releaseRef().

Pre condition:

• this thread has no pending JNI exception (!env->ExceptionCheck())

Post condition:

• return value is NULL:
  • this thread has a pending JNI exception (env->ExceptionCheck()) otherwise:
  • this thread has no pending JNI exception (!env->ExceptionCheck())
  • the returned reference is valid (at least) until releaseRef()

Reimplemented from MemberId< C >.

Reimplemented in MemberIdPreloadedStrongCache< C >.

Definition at line 344 of file jtie_tconv_idcache_impl.hpp.

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template<typename C >

static void MemberIdStrongCache< C >::releaseRef ( JNIEnv *  env, jclass  cls  )

inlinestatic

Allows for a class reference to be released along with any member IDs.

Pre condition:

• a valid class reference obtained by getClass(): assert(cls != NULL)
• this thread may have a pending JNI exception (env->ExceptionCheck())

Reimplemented from MemberId< C >.

Definition at line 357 of file jtie_tconv_idcache_impl.hpp.

template<typename C >

static void MemberIdStrongCache< C >::setClass ( JNIEnv *  env, jclass  cls  )

inlinestatic

Allows for storing a (global) class reference.

Usually only called from getClass(), but enables "cache preloading" from a (native, static) function called at class initialization.

Pre condition:

• this thread has no pending JNI exception (!env->ExceptionCheck())
• a valid local or global class reference: assert(cls != NULL)

Reimplemented from MemberId< C >.

Definition at line 334 of file jtie_tconv_idcache_impl.hpp.

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The documentation for this struct was generated from the following file:

• storage/ndb/src/ndbjtie/jtie/jtie_tconv_idcache_impl.hpp