bridges/source/jni_uno/nativethreadpool.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include <string.h>
  22 #include <jvmaccess/virtualmachine.hxx>
  23 #include <rtl/byteseq.h>
  24 #include <rtl/byteseq.hxx>
  25 #include <rtl/ref.hxx>
  26 #include <sal/types.h>
  27 #include <uno/threadpool.h>
  28
  29 #include <jni.h>
  30
  31 #include <new>
  32 #include <utility>
  33
  34 /* The native implementation part of
  35  * jurt/com/sun/star/lib/uno/environments/remote/NativeThreadPool.java.
  36  */
  37
  38 namespace {
  39
  40 struct Pool {
  41     Pool(rtl::Reference< jvmaccess::VirtualMachine > theVirtualMachine,
  42          jmethodID theExecute, uno_ThreadPool thePool):
  43         virtualMachine(std::move(theVirtualMachine)), execute(theExecute), pool(thePool) {}
  44
  45     rtl::Reference< jvmaccess::VirtualMachine > virtualMachine;
  46     jmethodID execute;
  47     uno_ThreadPool pool;
  48 };
  49
  50 struct Job {
  51     Job(Pool * thePool, jobject theJob): pool(thePool), job(theJob) {}
  52
  53     Pool * pool;
  54     jobject job;
  55 };
  56
  57 void throwOutOfMemory(JNIEnv * env) {
  58     jclass c = env->FindClass("java/lang/OutOfMemoryError");
  59     if (c != nullptr) {
  60         env->ThrowNew(c, "");
  61     }
  62 }
  63
  64 }
  65
  66 extern "C" {
  67
  68 static void executeRequest(void * data) {
  69     Job * job = static_cast< Job * >(data);
  70     try {
  71         jvmaccess::VirtualMachine::AttachGuard guard(job->pool->virtualMachine);
  72         JNIEnv * env = guard.getEnvironment();
  73         // Failure of the following Job.execute Java call is ignored; if that
  74         // call fails, it should be due to a java.lang.Error, which is not
  75         // handled well, anyway:
  76         env->CallObjectMethod(job->job, job->pool->execute);
  77         env->DeleteGlobalRef(job->job);
  78         delete job;
  79     } catch (const jvmaccess::VirtualMachine::AttachGuard::CreationException &) {
  80         //TODO: DeleteGlobalRef(job->job)
  81         delete job;
  82     }
  83 }
  84
  85 }
  86
  87 extern "C" SAL_JNI_EXPORT jbyteArray JNICALL
  88 Java_com_sun_star_lib_uno_environments_remote_NativeThreadPool_threadId(
  89     JNIEnv * env, SAL_UNUSED_PARAMETER jclass) noexcept
  90 {
  91     sal_Sequence * s = nullptr;
  92     uno_getIdOfCurrentThread(&s); //TODO: out of memory
  93     uno_releaseIdFromCurrentThread();
  94     rtl::ByteSequence seq(s);
  95     rtl_byte_sequence_release(s);
  96     sal_Int32 n = seq.getLength();
  97     jbyteArray a = env->NewByteArray(n);
  98         // sal_Int32 and jsize are compatible here
  99     if (a == nullptr) {
 100         return nullptr;
 101     }
 102     void * p = env->GetPrimitiveArrayCritical(a, nullptr);
 103     if (p == nullptr) {
 104         return nullptr;
 105     }
 106     memcpy(p, seq.getConstArray(), n);
 107         // sal_Int8 and jbyte ought to be compatible
 108     env->ReleasePrimitiveArrayCritical(a, p, 0);
 109     return a;
 110 }
 111
 112 extern "C" SAL_JNI_EXPORT jlong JNICALL
 113 Java_com_sun_star_lib_uno_environments_remote_NativeThreadPool_create(
 114     JNIEnv * env, SAL_UNUSED_PARAMETER jclass) noexcept
 115 {
 116     JavaVM * vm;
 117     if (env->GetJavaVM(&vm) != JNI_OK) { //TODO: no Java exception raised?
 118         jclass c = env->FindClass("java/lang/RuntimeException");
 119         if (c != nullptr) {
 120             env->ThrowNew(c, "JNI GetJavaVM failed");
 121         }
 122         return 0;
 123     }
 124     jclass c = env->FindClass("com/sun/star/lib/uno/environments/remote/Job");
 125     if (c == nullptr) {
 126         return 0;
 127     }
 128     jmethodID execute = env->GetMethodID(c, "execute", "()Ljava/lang/Object;");
 129     if (execute == nullptr) {
 130         return 0;
 131     }
 132     try {
 133         return reinterpret_cast< jlong >(new Pool(
 134             new jvmaccess::VirtualMachine(vm, env->GetVersion(), false, env),
 135             execute, uno_threadpool_create()));
 136     } catch (const std::bad_alloc &) {
 137         throwOutOfMemory(env);
 138         return 0;
 139     }
 140 }
 141
 142 extern "C" SAL_JNI_EXPORT void JNICALL
 143 Java_com_sun_star_lib_uno_environments_remote_NativeThreadPool_attach(
 144     SAL_UNUSED_PARAMETER JNIEnv *, SAL_UNUSED_PARAMETER jclass, jlong pool) noexcept
 145 {
 146     uno_threadpool_attach(reinterpret_cast< Pool * >(pool)->pool);
 147 }
 148
 149 extern "C" SAL_JNI_EXPORT jobject JNICALL
 150 Java_com_sun_star_lib_uno_environments_remote_NativeThreadPool_enter(
 151     JNIEnv * env, SAL_UNUSED_PARAMETER jclass, jlong pool) noexcept
 152 {
 153     jobject job;
 154     uno_threadpool_enter(
 155         reinterpret_cast< Pool * >(pool)->pool,
 156         reinterpret_cast< void ** >(&job));
 157     if (job == nullptr) {
 158         return nullptr;
 159     }
 160     jobject ref = env->NewLocalRef(job);
 161     env->DeleteGlobalRef(job);
 162     return ref;
 163 }
 164
 165 extern "C" SAL_JNI_EXPORT void JNICALL
 166 Java_com_sun_star_lib_uno_environments_remote_NativeThreadPool_detach(
 167     SAL_UNUSED_PARAMETER JNIEnv *, SAL_UNUSED_PARAMETER jclass, jlong pool) noexcept
 168 {
 169     uno_threadpool_detach(reinterpret_cast< Pool * >(pool)->pool);
 170 }
 171
 172 extern "C" SAL_JNI_EXPORT void JNICALL
 173 Java_com_sun_star_lib_uno_environments_remote_NativeThreadPool_putJob(
 174     JNIEnv * env, SAL_UNUSED_PARAMETER jclass, jlong pool, jbyteArray threadId,
 175     jobject job, jboolean request, jboolean oneWay) noexcept
 176 {
 177     void * s = env->GetPrimitiveArrayCritical(threadId, nullptr);
 178     if (s == nullptr) {
 179         return;
 180     }
 181     rtl::ByteSequence seq(
 182         static_cast< sal_Int8 * >(s), env->GetArrayLength(threadId));
 183         // sal_Int8 and jbyte ought to be compatible; sal_Int32 and jsize are
 184         // compatible here
 185         //TODO: out of memory
 186     env->ReleasePrimitiveArrayCritical(threadId, s, JNI_ABORT);
 187     Pool * p = reinterpret_cast< Pool * >(pool);
 188     jobject ref = env->NewGlobalRef(job);
 189     if (ref == nullptr) {
 190         return;
 191     }
 192     Job * j = nullptr;
 193     if (request) {
 194         j = new(std::nothrow) Job(p, ref);
 195         if (j == nullptr) {
 196             env->DeleteGlobalRef(ref);
 197             throwOutOfMemory(env);
 198             return;
 199         }
 200     }
 201     uno_threadpool_putJob(
 202         p->pool, seq.getHandle(),
 203         request ? static_cast< void * >(j) : static_cast< void * >(ref),
 204         request ? executeRequest : nullptr, oneWay);
 205 }
 206
 207 extern "C" SAL_JNI_EXPORT void JNICALL
 208 Java_com_sun_star_lib_uno_environments_remote_NativeThreadPool_dispose(
 209     SAL_UNUSED_PARAMETER JNIEnv *, SAL_UNUSED_PARAMETER jclass, jlong pool) noexcept
 210 {
 211     uno_threadpool_dispose(reinterpret_cast< Pool * >(pool)->pool);
 212 }
 213
 214 extern "C" SAL_JNI_EXPORT void JNICALL
 215 Java_com_sun_star_lib_uno_environments_remote_NativeThreadPool_destroy(
 216     SAL_UNUSED_PARAMETER JNIEnv *, SAL_UNUSED_PARAMETER jclass, jlong pool) noexcept
 217 {
 218     Pool * p = reinterpret_cast< Pool * >(pool);
 219     uno_threadpool_destroy(p->pool);
 220     delete p;
 221 }
 222
 223 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */