wpi::java::JCallbackThread< T > Class Template Reference

Generic callback thread implementation. More...

#include <wpi/jni_util.h>

Inheritance diagram for wpi::java::JCallbackThread< T >:

Public Member Functions
void	Main () override
Public Member Functions inherited from wpi::SafeThread
void	Stop () override
Public Member Functions inherited from wpi::SafeThreadBase
virtual	~SafeThreadBase ()=default
virtual void	Main ()=0
virtual void	Stop ()=0

Public Attributes
std::queue< T >	m_queue
jobject	m_func = nullptr
jmethodID	m_mid
Public Attributes inherited from wpi::SafeThread
wpi::condition_variable	m_cond
Public Attributes inherited from wpi::SafeThreadBase
wpi::mutex	m_mutex
std::atomic_bool	m_active {true}
std::thread::id	m_threadId

Detailed Description

template<typename T>
class wpi::java::JCallbackThread< T >

Generic callback thread implementation.

JNI's AttachCurrentThread() creates a Java Thread object on every invocation, which is both time inefficient and causes issues with Eclipse (which tries to keep a thread list up-to-date and thus gets swamped).

Instead, this class attaches just once. When a hardware notification occurs, a condition variable wakes up this thread and this thread actually makes the call into Java.

The template parameter T is the message being passed to the callback, but also needs to provide the following functions: static JavaVM* GetJVM(); static const char* GetName(); void CallJava(JNIEnv *env, jobject func, jmethodID mid);

Member Function Documentation

Main()

template<typename T >

void wpi::java::JCallbackThread< T >::Main

overridevirtual

Implements wpi::SafeThreadBase.

Member Data Documentation

m_func

template<typename T >

jobject wpi::java::JCallbackThread< T >::m_func = nullptr

m_mid

template<typename T >

jmethodID wpi::java::JCallbackThread< T >::m_mid

m_queue

template<typename T >

std::queue<T> wpi::java::JCallbackThread< T >::m_queue

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

• wpi/jni_util.h