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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/android/task_scheduler/task_runner_android.h"
#include <array>
#include <string>
#include <utility>
#include "base/android/jni_string.h"
#include "base/check.h"
#include "base/compiler_specific.h"
#include "base/functional/bind.h"
#include "base/no_destructor.h"
#include "base/strings/strcat.h"
#include "base/task/current_thread.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/task/thread_pool/thread_pool_impl.h"
#include "base/task/thread_pool/thread_pool_instance.h"
#include "base/time/time.h"
#include "base/trace_event/trace_event.h"
// Must come after all headers that specialize FromJniType() / ToJniType().
#include "base/android_runtime_jni_headers/Runnable_jni.h"
#include "base/tasks_jni/TaskRunnerImpl_jni.h"
namespace base {
namespace {
TaskRunnerAndroid::UiThreadTaskRunnerCallback& GetUiThreadTaskRunnerCallback() {
static base::NoDestructor<TaskRunnerAndroid::UiThreadTaskRunnerCallback>
callback;
return *callback;
}
void RunJavaTask(jint task_index) {
Java_TaskRunnerImpl_runTask(jni_zero::AttachCurrentThread(), task_index);
}
} // namespace
jlong JNI_TaskRunnerImpl_Init(JNIEnv* env,
jint task_runner_type,
jint task_traits) {
TaskRunnerAndroid* task_runner =
TaskRunnerAndroid::Create(task_runner_type, task_traits).release();
return reinterpret_cast<intptr_t>(task_runner);
}
TaskRunnerAndroid::TaskRunnerAndroid(scoped_refptr<TaskRunner> task_runner,
TaskRunnerType type)
: task_runner_(std::move(task_runner)), type_(type) {}
TaskRunnerAndroid::~TaskRunnerAndroid() = default;
void TaskRunnerAndroid::Destroy(JNIEnv* env) {
// This could happen on any thread.
delete this;
}
void TaskRunnerAndroid::PostDelayedTask(JNIEnv* env,
jlong delay,
jint task_index) {
// This could be run on any java thread, so we can't cache |env| in the
// BindOnce because JNIEnv is thread specific.
task_runner_->PostDelayedTask(
FROM_HERE, base::BindOnce(&RunJavaTask, task_index), Milliseconds(delay));
}
// static
std::unique_ptr<TaskRunnerAndroid> TaskRunnerAndroid::Create(
jint task_runner_type,
jint j_task_traits) {
TaskTraits task_traits;
bool use_thread_pool = true;
switch (j_task_traits) {
case ::TaskTraits::BEST_EFFORT:
task_traits = {TaskPriority::BEST_EFFORT};
break;
case ::TaskTraits::BEST_EFFORT_MAY_BLOCK:
task_traits = {base::MayBlock(), TaskPriority::BEST_EFFORT};
break;
case ::TaskTraits::USER_VISIBLE:
task_traits = {TaskPriority::USER_VISIBLE};
break;
case ::TaskTraits::USER_VISIBLE_MAY_BLOCK:
task_traits = {base::MayBlock(), TaskPriority::USER_VISIBLE};
break;
case ::TaskTraits::USER_BLOCKING:
task_traits = {TaskPriority::USER_BLOCKING};
break;
case ::TaskTraits::USER_BLOCKING_MAY_BLOCK:
task_traits = {base::MayBlock(), TaskPriority::USER_BLOCKING};
break;
case ::TaskTraits::UI_BEST_EFFORT:
[[fallthrough]];
case ::TaskTraits::UI_USER_VISIBLE:
[[fallthrough]];
case ::TaskTraits::UI_USER_BLOCKING:
use_thread_pool = false;
break;
}
scoped_refptr<TaskRunner> task_runner;
if (use_thread_pool) {
switch (static_cast<TaskRunnerType>(task_runner_type)) {
case TaskRunnerType::BASE:
task_runner = base::ThreadPool::CreateTaskRunner(task_traits);
break;
case TaskRunnerType::SEQUENCED:
task_runner = base::ThreadPool::CreateSequencedTaskRunner(task_traits);
break;
case TaskRunnerType::SINGLE_THREAD:
task_runner = base::ThreadPool::CreateSingleThreadTaskRunner(
task_traits, SingleThreadTaskRunnerThreadMode::SHARED);
break;
}
} else {
CHECK(static_cast<TaskRunnerType>(task_runner_type) ==
TaskRunnerType::SINGLE_THREAD);
CHECK(GetUiThreadTaskRunnerCallback());
task_runner = GetUiThreadTaskRunnerCallback().Run(
static_cast<::TaskTraits>(j_task_traits));
}
return std::make_unique<TaskRunnerAndroid>(
task_runner, static_cast<TaskRunnerType>(task_runner_type));
}
// static
void TaskRunnerAndroid::SetUiThreadTaskRunnerCallback(
UiThreadTaskRunnerCallback callback) {
GetUiThreadTaskRunnerCallback() = std::move(callback);
}
} // namespace base
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