ceph/src/rocksdb/java/rocksjni/transaction_notifier_jnicallback.cc

   1 // Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5 //
   6 // This file implements the callback "bridge" between Java and C++ for
   7 // rocksdb::TransactionNotifier.
   8
   9 #include "rocksjni/transaction_notifier_jnicallback.h"
  10 #include "rocksjni/portal.h"
  11
  12 namespace rocksdb {
  13
  14 TransactionNotifierJniCallback::TransactionNotifierJniCallback(JNIEnv* env,
  15     jobject jtransaction_notifier) : JniCallback(env, jtransaction_notifier) {
  16   // we cache the method id for the JNI callback
  17   m_jsnapshot_created_methodID =
  18       AbstractTransactionNotifierJni::getSnapshotCreatedMethodId(env);
  19 }
  20
  21 void TransactionNotifierJniCallback::SnapshotCreated(
  22     const Snapshot* newSnapshot) {
  23   jboolean attached_thread = JNI_FALSE;
  24   JNIEnv* env = getJniEnv(&attached_thread);
  25   assert(env != nullptr);
  26
  27   env->CallVoidMethod(m_jcallback_obj,
  28       m_jsnapshot_created_methodID, reinterpret_cast<jlong>(newSnapshot));
  29
  30   if(env->ExceptionCheck()) {
  31     // exception thrown from CallVoidMethod
  32     env->ExceptionDescribe();  // print out exception to stderr
  33     releaseJniEnv(attached_thread);
  34     return;
  35   }
  36
  37   releaseJniEnv(attached_thread);
  38 }
  39 }  // namespace rocksdb