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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/messagebus/routing/iroutingpolicy.h>
#include <vespa/vespalib/util/executor.h>
#include <vespa/documentapi/common.h>
#include <map>
#include <mutex>
namespace documentapi {
class AsyncInitializationPolicy : public mbus::IRoutingPolicy {
public:
AsyncInitializationPolicy(const std::map<string, string>& parameters);
~AsyncInitializationPolicy() override;
static std::map<string, string> parse(string parameters);
/**
* This function is called asynchronously at some point after the
* first select() is called.
*
* @return
*/
virtual string init() = 0;
void select(mbus::RoutingContext &context) override;
virtual void doSelect(mbus::RoutingContext& context) = 0;
const string& getError() {
return _error;
}
void initSynchronous();
/**
* Signal that subclass should be async initialized. Must be called prior
* to the first invocation of select().
*/
void needAsynchronousInit() { _syncInit = false; }
private:
class Task : public vespalib::Executor::Task
{
public:
Task(AsyncInitializationPolicy& owner)
: _owner(owner)
{
}
Task(const Task&) = delete;
Task& operator=(const Task&) = delete;
void run() override;
private:
AsyncInitializationPolicy& _owner;
};
friend class Task;
std::unique_ptr<vespalib::Executor> _executor;
std::mutex _lock;
enum class State {
NOT_STARTED,
RUNNING,
FAILED,
DONE
};
State _state;
protected:
string _error;
bool _syncInit;
};
}
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