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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "task_runner.h"
#include <vespa/vespalib/util/lambdatask.h>
#include <vespa/vespalib/util/threadstackexecutor.h>
#include <future>
using vespalib::makeLambdaTask;
namespace proton::initializer {
namespace {
VESPA_THREAD_STACK_TAG(task_runner)
}
TaskRunner::TaskRunner(vespalib::Executor &executor)
: _executor(executor),
_runningTasks(0u)
{
}
TaskRunner::~TaskRunner()
{
assert(_runningTasks == 0u);
}
void
TaskRunner::getReadyTasks(const InitializerTask::SP task, TaskList &readyTasks, TaskSet &checked)
{
if (task->getState() != State::BLOCKED) {
return; // task running or done, all dependencies done
}
if (!checked.insert(task.get()).second) {
return; // task already checked from another depender
}
const TaskList &deps = task->getDependencies();
bool ready = true;
for (const auto &dep : deps) {
switch (dep->getState()) {
case State::RUNNING:
ready = false;
break;
case State::DONE:
break;
case State::BLOCKED:
ready = false;
getReadyTasks(dep, readyTasks, checked);
}
}
if (ready) {
readyTasks.push_back(task);
}
}
void
TaskRunner::setTaskRunning(InitializerTask &task)
{
// run by context executor
task.setRunning();
++_runningTasks;
}
void
TaskRunner::setTaskDone(InitializerTask &task, Context::SP context)
{
// run by context executor
task.setDone();
--_runningTasks;
pollTask(context);
}
void
TaskRunner::internalRunTask(InitializerTask::SP task, Context::SP context)
{
// run by context executor
assert(task->getState() == State::BLOCKED);
setTaskRunning(*task);
auto done(makeLambdaTask([this, task, context]() { setTaskDone(*task, context); }));
_executor.execute(makeLambdaTask([task, context, done(std::move(done))]() mutable
{ task->run();
context->execute(std::move(done)); }));
}
void
TaskRunner::internalRunTasks(const TaskList &taskList, Context::SP context)
{
// run by context executor
for (auto &task : taskList) {
internalRunTask(task, context);
}
}
void
TaskRunner::runTask(InitializerTask::SP task)
{
vespalib::ThreadStackExecutor executor(1, task_runner);
std::promise<void> promise;
auto future = promise.get_future();
runTask(task, executor, makeLambdaTask([&]() { promise.set_value(); }));
future.wait();
}
void
TaskRunner::pollTask(Context::SP context)
{
// run by context executor
if (context->done()) {
return;
}
if (context->rootTask()->getState() == State::DONE) {
context->setDone();
return;
}
TaskList readyTasks;
TaskSet checked;
getReadyTasks(context->rootTask(), readyTasks, checked);
std::sort(readyTasks.begin(), readyTasks.end(), [](const auto &a, const auto &b) -> bool { return a->get_transient_memory_usage() > b->get_transient_memory_usage(); });
internalRunTasks(readyTasks, context);
}
void
TaskRunner::runTask(InitializerTask::SP rootTask,
vespalib::Executor &contextExecutor,
vespalib::Executor::Task::UP doneTask)
{
auto context(std::make_shared<Context>(rootTask, contextExecutor, std::move(doneTask)));
context->execute(makeLambdaTask([this, context=std::move(context)]() { pollTask(context); } ));
}
}
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