mirror of https://github.com/facebook/rocksdb.git
119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// This file implements the callback "bridge" between Java and C++ for
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// ROCKSDB_NAMESPACE::TraceWriter.
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#include "rocksjni/trace_writer_jnicallback.h"
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#include "rocksjni/portal.h"
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namespace ROCKSDB_NAMESPACE {
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TraceWriterJniCallback::TraceWriterJniCallback(JNIEnv* env,
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jobject jtrace_writer)
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: JniCallback(env, jtrace_writer) {
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m_jwrite_proxy_methodid = AbstractTraceWriterJni::getWriteProxyMethodId(env);
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if (m_jwrite_proxy_methodid == nullptr) {
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// exception thrown: NoSuchMethodException or OutOfMemoryError
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return;
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}
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m_jclose_writer_proxy_methodid =
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AbstractTraceWriterJni::getCloseWriterProxyMethodId(env);
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if (m_jclose_writer_proxy_methodid == nullptr) {
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// exception thrown: NoSuchMethodException or OutOfMemoryError
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return;
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}
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m_jget_file_size_methodid =
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AbstractTraceWriterJni::getGetFileSizeMethodId(env);
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if (m_jget_file_size_methodid == nullptr) {
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// exception thrown: NoSuchMethodException or OutOfMemoryError
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return;
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}
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}
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Status TraceWriterJniCallback::Write(const Slice& data) {
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jboolean attached_thread = JNI_FALSE;
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JNIEnv* env = getJniEnv(&attached_thread);
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if (env == nullptr) {
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return Status::IOError("Unable to attach JNI Environment");
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}
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jshort jstatus =
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env->CallShortMethod(m_jcallback_obj, m_jwrite_proxy_methodid, &data);
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if (env->ExceptionCheck()) {
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// exception thrown from CallShortMethod
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env->ExceptionDescribe(); // print out exception to stderr
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releaseJniEnv(attached_thread);
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return Status::IOError(
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"Unable to call AbstractTraceWriter#writeProxy(long)");
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}
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// unpack status code and status sub-code from jstatus
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jbyte jcode_value = (jstatus >> 8) & 0xFF;
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jbyte jsub_code_value = jstatus & 0xFF;
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std::unique_ptr<Status> s =
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StatusJni::toCppStatus(jcode_value, jsub_code_value);
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releaseJniEnv(attached_thread);
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return Status(*s);
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}
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Status TraceWriterJniCallback::Close() {
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jboolean attached_thread = JNI_FALSE;
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JNIEnv* env = getJniEnv(&attached_thread);
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if (env == nullptr) {
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return Status::IOError("Unable to attach JNI Environment");
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}
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jshort jstatus =
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env->CallShortMethod(m_jcallback_obj, m_jclose_writer_proxy_methodid);
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if (env->ExceptionCheck()) {
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// exception thrown from CallShortMethod
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env->ExceptionDescribe(); // print out exception to stderr
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releaseJniEnv(attached_thread);
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return Status::IOError(
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"Unable to call AbstractTraceWriter#closeWriterProxy()");
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}
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// unpack status code and status sub-code from jstatus
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jbyte code_value = (jstatus >> 8) & 0xFF;
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jbyte sub_code_value = jstatus & 0xFF;
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std::unique_ptr<Status> s =
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StatusJni::toCppStatus(code_value, sub_code_value);
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releaseJniEnv(attached_thread);
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return Status(*s);
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}
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uint64_t TraceWriterJniCallback::GetFileSize() {
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jboolean attached_thread = JNI_FALSE;
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JNIEnv* env = getJniEnv(&attached_thread);
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if (env == nullptr) {
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return 0;
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}
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jlong jfile_size =
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env->CallLongMethod(m_jcallback_obj, m_jget_file_size_methodid);
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if (env->ExceptionCheck()) {
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// exception thrown from CallLongMethod
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env->ExceptionDescribe(); // print out exception to stderr
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releaseJniEnv(attached_thread);
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return 0;
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}
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releaseJniEnv(attached_thread);
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return static_cast<uint64_t>(jfile_size);
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}
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} // namespace ROCKSDB_NAMESPACE
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