JniEnvRef Class Reference

Wrapper for a JNIEnv pointer. More...

#include <JniUtil.h>

Inheritance diagram for JniEnvRef:

List of all members.

Public Member Functions
	JniEnvRef (JNIEnv *pEnvInit)
	Explicit constructor: use supplied JNIEnv pointer.
void	operator= (JniEnvRef const &other)
JniExceptionChecker	operator-> () const
JNIEnv *	get ()
void	handleExcn (std::exception &ex)
Private Attributes
JNIEnv *	pEnv

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Detailed Description

Wrapper for a JNIEnv pointer.

This allows us to automatically progagate exceptions from all calls to JNIEnv by using the call wrapper technique (except without the shared_ptrs, because they're too slow!).

Definition at line 73 of file JniUtil.h.

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Constructor & Destructor Documentation

JniEnvRef::JniEnvRef

(

JNIEnv *

pEnvInit

)

[inline, explicit]

Explicit constructor: use supplied JNIEnv pointer.

Definition at line 81 of file JniUtil.h.

    {
        pEnv = pEnvInit;
    }

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Member Function Documentation

void JniEnvRef::operator=

(

JniEnvRef const &

other

)

[inline]

Definition at line 86 of file JniUtil.h.

References pEnv.

    {
        pEnv = other.pEnv;
    }

JniExceptionChecker JniEnvRef::operator->

(

)

const [inline]

Definition at line 91 of file JniUtil.h.

    {
        return JniExceptionChecker(pEnv);
    }

JNIEnv* JniEnvRef::get

(

)

[inline]

Definition at line 96 of file JniUtil.h.

Referenced by JniLocalRefReaper::JniLocalRefReaper().

    {
        return pEnv;
    }

void JniEnvRef::handleExcn

(

std::exception &

ex

)

Definition at line 540 of file JniUtil.cpp.

References JavaExcn::getJavaException(), FennelExcn::getMessage(), and pEnv.

Referenced by Java_com_lucidera_farrago_fennel_LucidEraJni_registerStreamFactory(), Java_net_sf_farrago_fennel_FennelStorage_executeJavaCmd(), Java_net_sf_farrago_fennel_FennelStorage_tupleStreamFetch(), Java_net_sf_farrago_fennel_FennelStorage_tupleStreamGraphClose(), Java_net_sf_farrago_fennel_FennelStorage_tupleStreamGraphGetInputStreams(), Java_net_sf_farrago_fennel_FennelStorage_tupleStreamGraphOpen(), Java_net_sf_farrago_fennel_FennelStorage_tupleStreamRestart(), Java_net_sf_farrago_fennel_FennelStorage_tupleStreamTransformFetch(), and JNI_OnLoad().

{
    JavaExcn *pJavaExcn = dynamic_cast<JavaExcn *>(&ex);
    if (pJavaExcn) {
        pEnv->Throw(pJavaExcn->getJavaException());
        return;
    }
    std::string what;
    FennelExcn *pFennelExcn = dynamic_cast<FennelExcn *>(&ex);
    if (pFennelExcn) {
        what = pFennelExcn->getMessage();
    } else {
        std::bad_alloc *pBadAllocExcn =
            dynamic_cast<std::bad_alloc *>(&ex);
        if (pBadAllocExcn) {
            // Convert bad_alloc's terrible error mesage into something fit for
            // human consumption.
            what = FennelResource::instance().internalError("malloc failed");
        } else {
            what = FennelResource::instance().internalError(ex.what());
        }
    }
    // TODO:  need special-case handling for out-of-memory here
    jclass classSQLException = pEnv->FindClass("java/sql/SQLException");
    jstring jMessage = pEnv->NewStringUTF(what.c_str());
    jmethodID constructor = pEnv->GetMethodID(
        classSQLException,"<init>","(Ljava/lang/String;)V");
    jthrowable t = (jthrowable)
        pEnv->NewObject(classSQLException,constructor,jMessage);
    pEnv->Throw(t);
}

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Member Data Documentation

JNIEnv* JniEnvRef::pEnv [private]

Definition at line 75 of file JniUtil.h.

Referenced by handleExcn(), and operator=().

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The documentation for this class was generated from the following files:

• /home/pub/open/dev/fennel/farrago/JniUtil.h
• /home/pub/open/dev/fennel/farrago/JniUtil.cpp

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