C++ Actor Framework 0.19
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Classes | Public Types | Public Member Functions | List of all members
caf::blocking_actor Class Reference

A thread-mapped or context-switching actor using a blocking receive rather than a behavior-stack based message processing. More...

#include <blocking_actor.hpp>

Inheritance diagram for caf::blocking_actor:
caf::local_actor caf::dynamically_typed_actor_base caf::blocking_actor_base caf::monitorable_actor caf::abstract_actor caf::abstract_channel

Classes

class  accept_one_cond
 Pseudo receive condition modeling a single receive. More...
 
struct  do_receive_helper
 Implementation helper for blocking_actor::do_receive. More...
 
class  receive_cond
 Represents pre- and postconditions for receive loops. More...
 
struct  receive_for_helper
 Implementation helper for blocking_actor::receive_for. More...
 
struct  receive_while_helper
 Implementation helper for blocking_actor::receive_while. More...
 

Public Types

using super = extended_base
 Base type.
 
using timeout_type = std::chrono::high_resolution_clock::time_point
 Absolute timeout type.
 
using behavior_type = behavior
 Supported behavior type.
 
using signatures = none_t
 Declared message passing interface.
 
- Public Types inherited from caf::local_actor
using clock_type = std::chrono::steady_clock
 Defines a monotonic clock suitable for measuring intervals.
 

Public Member Functions

 blocking_actor (actor_config &cfg)
 
bool enqueue (mailbox_element_ptr, execution_unit *) override
 Enqueues a new message wrapped in a mailbox_element to the actor.
 
mailbox_element * peek_at_next_mailbox_element () override
 
const char * name () const override
 Returns an implementation-dependent name for logging purposes, which is only valid as long as the actor is running.
 
void launch (execution_unit *eu, bool lazy, bool hide) override
 
virtual void act ()
 Implements the actor's behavior.
 
template<class... Ts>
void receive (Ts &&... xs)
 Dequeues the next message from the mailbox that is matched by given behavior.
 
template<class T >
receive_for_helper< T > receive_for (T &begin, T end)
 Receives messages for range [begin, first).
 
receive_while_helper receive_while (std::function< bool()> stmt)
 Receives messages as long as stmt returns true.
 
receive_while_helper receive_while (const bool &ref)
 Receives messages as long as ref is true.
 
template<class... Ts>
do_receive_helper do_receive (Ts &&... xs)
 Receives messages until stmt returns true.
 
void await_all_other_actors_done ()
 Blocks this actor until all other actors are done.
 
template<class... Ts>
void wait_for (Ts &&... xs)
 Blocks this actor until all xs... have terminated.
 
void fail_state (error err)
 Sets a user-defined exit reason err.
 
virtual void await_data ()
 Blocks until at least one message is in the mailbox.
 
virtual bool await_data (timeout_type timeout)
 Blocks until at least one message is in the mailbox or the absolute timeout was reached.
 
virtual mailbox_element_ptr dequeue ()
 Returns the next element from the mailbox or nullptr.
 
abstract_mailboxmailbox ()
 Returns the queue for storing incoming messages.
 
- Public Member Functions inherited from caf::local_actor
 local_actor (actor_config &cfg)
 
void on_destroy () override
 Cleans up any remaining state before the destructor is called.
 
void setup_metrics ()
 
virtual void launch (execution_unit *eu, bool lazy, bool hide)=0
 
clock_type::time_point now () const noexcept
 Returns the current time.
 
disposable request_response_timeout (timespan d, message_id mid)
 Requests a new timeout for mid.
 
template<class T , spawn_options Os = no_spawn_options, class... Ts>
infer_handle_from_class_t< T > spawn (Ts &&... xs)
 
template<spawn_options Os = no_spawn_options, class F , class... Ts>
infer_handle_from_fun_t< F > spawn (F fun, Ts &&... xs)
 
template<class T , spawn_options Os = no_spawn_options, class Groups , class... Ts>
actor spawn_in_groups (const Groups &gs, Ts &&... xs)
 
template<class T , spawn_options Os = no_spawn_options, class... Ts>
actor spawn_in_groups (std::initializer_list< group > gs, Ts &&... xs)
 
template<class T , spawn_options Os = no_spawn_options, class... Ts>
actor spawn_in_group (const group &grp, Ts &&... xs)
 
template<spawn_options Os = no_spawn_options, class Groups , class F , class... Ts>
actor spawn_in_groups (const Groups &gs, F fun, Ts &&... xs)
 
template<spawn_options Os = no_spawn_options, class F , class... Ts>
actor spawn_in_groups (std::initializer_list< group > gs, F fun, Ts &&... xs)
 
template<spawn_options Os = no_spawn_options, class F , class... Ts>
actor spawn_in_group (const group &grp, F fun, Ts &&... xs)
 
void send_exit (const actor_addr &whom, error reason)
 Sends an exit message to whom.
 
void send_exit (const strong_actor_ptr &whom, error reason)
 Sends an exit message to whom.
 
template<class ActorHandle >
void send_exit (const ActorHandle &whom, error reason)
 Sends an exit message to whom.
 
execution_unitcontext () const noexcept
 Returns the execution unit currently used by this actor.
 
void context (execution_unit *x) noexcept
 Sets the execution unit for this actor.
 
actor_systemsystem () const noexcept
 Returns the hosting actor system.
 
const actor_system_configconfig () const noexcept
 Returns the config of the hosting actor system.
 
actor_clockclock () const noexcept
 Returns the clock of the actor system.
 
strong_actor_ptrcurrent_sender () noexcept
 Returns a pointer to the sender of the current message.
 
message_id current_message_id () noexcept
 Returns the ID of the current message.
 
message_id take_current_message_id () noexcept
 Returns the ID of the current message and marks the ID stored in the current mailbox element as answered.
 
void drop_current_message_id () noexcept
 Marks the current message ID as answered.
 
strong_actor_ptr current_next_stage () noexcept
 Returns a pointer to the next stage from the forwarding path of the current message or nullptr if the path is empty.
 
strong_actor_ptr take_current_next_stage ()
 Returns a pointer to the next stage from the forwarding path of the current message and removes it from the path.
 
const mailbox_element::forwarding_stack & current_forwarding_stack () noexcept
 Returns the forwarding stack from the current mailbox element.
 
mailbox_element::forwarding_stack take_current_forwarding_stack () noexcept
 Moves the forwarding stack from the current mailbox element.
 
mailbox_element * current_mailbox_element () noexcept
 Returns a pointer to the currently processed mailbox element.
 
void monitor (const node_id &node)
 Adds a unidirectional monitor to node.
 
template<message_priority P = message_priority::normal, class Handle >
void monitor (const Handle &whom)
 Adds a unidirectional monitor to whom.
 
void demonitor (const actor_addr &whom)
 Removes a monitor from whom.
 
void demonitor (const strong_actor_ptr &whom)
 Removes a monitor from whom.
 
void demonitor (const node_id &node)
 Removes a monitor from node.
 
template<class Handle >
void demonitor (const Handle &whom)
 Removes a monitor from whom.
 
virtual void on_exit ()
 Can be overridden to perform cleanup code after an actor finished execution.
 
template<class... Ts>
detail::response_promise_t< Ts... > make_response_promise ()
 Creates a typed_response_promise to respond to a request later on.
 
response_promise make_response_promise ()
 Creates a response_promise to respond to a request later on.
 
const char * name () const override
 Returns an implementation-dependent name for logging purposes, which is only valid as long as the actor is running.
 
virtual error save_state (serializer &sink, unsigned int version)
 Serializes the state of this actor to sink.
 
virtual error load_state (deserializer &source, unsigned int version)
 Deserializes the state of this actor from source.
 
const errorfail_state () const noexcept
 Returns the currently defined fail state.
 
- Public Member Functions inherited from caf::monitorable_actor
virtual const char * name () const
 Returns an implementation-dependent name for logging purposes, which is only valid as long as the actor is running.
 
void attach (attachable_ptr ptr) override
 Attaches ptr to this actor.
 
size_t detach (const attachable::token &what) override
 Detaches the first attached object that matches what.
 
void link_to (const actor_addr &x)
 Links this actor to x.
 
template<class ActorHandle >
void link_to (const ActorHandle &x)
 Links this actor to x.
 
void unlink_from (const actor_addr &x)
 Unlinks this actor from x.
 
template<class ActorHandle >
void unlink_from (const ActorHandle &x)
 Links this actor to x.
 
- Public Member Functions inherited from caf::abstract_actor
actor_control_blockctrl () const
 
 abstract_actor (const abstract_actor &)=delete
 
abstract_actoroperator= (const abstract_actor &)=delete
 
virtual void on_destroy ()
 Cleans up any remaining state before the destructor is called.
 
bool enqueue (strong_actor_ptr sender, message_id mid, message msg, execution_unit *host) override
 Enqueues a new message without forwarding stack to the channel.
 
virtual bool enqueue (mailbox_element_ptr what, execution_unit *host)=0
 Enqueues a new message wrapped in a mailbox_element to the actor.
 
virtual void attach (attachable_ptr ptr)=0
 Attaches ptr to this actor.
 
template<class F >
void attach_functor (F f)
 Convenience function that attaches the functor f to this actor.
 
actor_addr address () const noexcept
 Returns the logical actor address.
 
virtual size_t detach (const attachable::token &what)=0
 Detaches the first attached object that matches what.
 
virtual std::set< std::string > message_types () const
 Returns the set of accepted messages types as strings or an empty set if this actor is untyped.
 
actor_id id () const noexcept
 Returns the ID of this actor.
 
node_id node () const noexcept
 Returns the node this actor is living on.
 
actor_systemhome_system () const noexcept
 Returns the system that created this actor (or proxy).
 
- Public Member Functions inherited from caf::abstract_channel
virtual bool enqueue (strong_actor_ptr sender, message_id mid, message content, execution_unit *host=nullptr)=0
 Enqueues a new message without forwarding stack to the channel.
 
bool is_abstract_actor () const
 
bool is_abstract_group () const
 
bool is_actor_decorator () const
 

Additional Inherited Members

- Static Public Attributes inherited from caf::abstract_channel
static constexpr int is_abstract_actor_flag = 0x01000000
 
static constexpr int is_abstract_group_flag = 0x02000000
 
static constexpr int is_actor_bind_decorator_flag = 0x04000000
 
static constexpr int is_actor_dot_decorator_flag = 0x08000000
 
static constexpr int is_actor_decorator_mask = 0x0C000000
 
static constexpr int is_hidden_flag = 0x10000000
 
- Protected Member Functions inherited from caf::monitorable_actor
virtual void on_cleanup (const error &reason)
 Allows subclasses to add additional cleanup code to the critical section in cleanup.
 
void bounce (mailbox_element_ptr &what)
 Sends a response message if what is a request.
 
void bounce (mailbox_element_ptr &what, const error &err)
 Sends a response message if what is a request.
 
 monitorable_actor (actor_config &cfg)
 Creates a new actor instance.
 
void attach_impl (attachable_ptr &ptr)
 
size_t detach_impl (const attachable::token &what, bool stop_on_hit=false, bool dry_run=false)
 
bool handle_system_message (mailbox_element &x, execution_unit *ctx, bool trap_exit)
 
template<class F >
bool handle_system_message (mailbox_element &x, execution_unit *context, bool trap_exit, F &down_msg_handler)
 
- Protected Member Functions inherited from caf::abstract_actor
 abstract_actor (actor_config &cfg)
 
- Protected Member Functions inherited from caf::abstract_channel
int flags () const
 
void flags (int new_value)
 
- Protected Attributes inherited from caf::local_actor
execution_unitcontext_
 
mailbox_element * current_element_
 
message_id last_request_id_
 
detail::unique_function< behavior(local_actor *)> initial_behavior_fac_
 Factory function for returning initial behavior in function-based actors.
 
metrics_t metrics_
 
- Protected Attributes inherited from caf::monitorable_actor
error fail_state_
 
std::condition_variable cv_
 
attachable_ptr attachables_head_
 
- Protected Attributes inherited from caf::abstract_actor
std::mutex mtx_
 

Detailed Description

A thread-mapped or context-switching actor using a blocking receive rather than a behavior-stack based message processing.

Member Function Documentation

◆ do_receive()

template<class... Ts>
do_receive_helper caf::blocking_actor::do_receive ( Ts &&...  xs)

Receives messages until stmt returns true.

Semantically equal to: do { receive(...); } while (stmt() == false);

Usage example:

int i = 0;
(
on<int>() >> int_fun,
on<float>() >> float_fun
)
.until([&]() { return (++i >= 10); };
do_receive_helper do_receive(Ts &&... xs)
Receives messages until stmt returns true.
Definition blocking_actor.hpp:253

◆ enqueue()

bool caf::blocking_actor::enqueue ( mailbox_element_ptr  what,
execution_unit host 
)
overridevirtual

Enqueues a new message wrapped in a mailbox_element to the actor.

This enqueue variant allows to define forwarding chains.

Returns
true if the message has added to the mailbox, false otherwise. In the latter case, the actor terminated and the message has been dropped. Once this function returns false, it returns false for all future invocations.
Note
The returned value is purely informational and may be used to discard actor handles early. Messages may still get dropped later even if this function returns true. In particular when dealing with remote actors.

Implements caf::abstract_actor.

◆ fail_state()

void caf::blocking_actor::fail_state ( error  err)

Sets a user-defined exit reason err.

This reason is signalized to other actors after act() returns.

◆ launch()

void caf::blocking_actor::launch ( execution_unit eu,
bool  lazy,
bool  hide 
)
overridevirtual

Implements caf::local_actor.

◆ name()

const char * caf::blocking_actor::name ( ) const
overridevirtual

Returns an implementation-dependent name for logging purposes, which is only valid as long as the actor is running.

The default implementation simply returns "actor".

Reimplemented from caf::monitorable_actor.

◆ receive_for()

template<class T >
receive_for_helper< T > caf::blocking_actor::receive_for ( T &  begin,
end 
)

Receives messages for range [begin, first).

Semantically equal to: for ( ; begin != end; ++begin) { receive(...); }.

Usage example:

int i = 0;
receive_for(i, 10) (
[&](get_atom) {
return i;
}
);
receive_for_helper< T > receive_for(T &begin, T end)
Receives messages for range [begin, first).
Definition blocking_actor.hpp:209

◆ receive_while() [1/2]

blocking_actor::receive_while_helper caf::blocking_actor::receive_while ( const bool &  ref)

Receives messages as long as ref is true.

Semantically equal to: while (ref) { receive(...); }.

Usage example:

bool running = true;
receive_while(running) (
...
);
receive_while_helper receive_while(std::function< bool()> stmt)
Receives messages as long as stmt returns true.
Definition blocking_actor.cpp:183

◆ receive_while() [2/2]

blocking_actor::receive_while_helper caf::blocking_actor::receive_while ( std::function< bool()>  stmt)

Receives messages as long as stmt returns true.

Semantically equal to: while (stmt()) { receive(...); }.

Usage example:

int i = 0;
receive_while([&]() { return (++i <= 10); }) (
...
);

The documentation for this class was generated from the following files: