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#pragma once
#include <mbgl/util/optional.hpp>
#include <memory>
#include <mutex>
#include <queue>
namespace mbgl {
class Scheduler;
class Message;
class Mailbox : public std::enable_shared_from_this<Mailbox> {
public:
// Create a "holding" mailbox, messages to which will remain queued,
// unconsumed, until the mailbox is associated with a Scheduler using
// start(). This allows a Mailbox object to be created on one thread and
// later transferred to a different target thread that may not yet exist.
Mailbox();
Mailbox(Scheduler&);
// Attach the given scheduler to this mailbox and begin processing messages
// sent to it. The mailbox must be a "holding" mailbox, as created by the
// default constructor Mailbox().
void open(Scheduler& scheduler_);
void close();
bool isOpen() const;
void push(std::unique_ptr<Message>);
void receive();
static void maybeReceive(std::weak_ptr<Mailbox>);
private:
optional<Scheduler*> scheduler;
std::recursive_mutex receivingMutex;
std::mutex pushingMutex;
bool closed { false };
std::mutex queueMutex;
std::queue<std::unique_ptr<Message>> queue;
};
} // namespace mbgl
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