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/*************************************************************************/
/* message_queue.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "message_queue.h"
#include "core/project_settings.h"
#include "core/script_language.h"
MessageQueue *MessageQueue::singleton = NULL;
MessageQueue *MessageQueue::get_singleton() {
return singleton;
}
Error MessageQueue::push_call(ObjectID p_id, const StringName &p_method, const Variant **p_args, int p_argcount, bool p_show_error) {
_THREAD_SAFE_METHOD_
int room_needed = sizeof(Message) + sizeof(Variant) * p_argcount;
if ((buffer_end + room_needed) >= buffer_size) {
String type;
if (ObjectDB::get_instance(p_id))
type = ObjectDB::get_instance(p_id)->get_class();
print_line("Failed method: " + type + ":" + p_method + " target ID: " + itos(p_id));
statistics();
ERR_EXPLAIN("Message queue out of memory. Try increasing 'message_queue_size_kb' in project settings.");
ERR_FAIL_V(ERR_OUT_OF_MEMORY);
}
Message *msg = memnew_placement(&buffer[buffer_end], Message);
msg->args = p_argcount;
msg->instance_id = p_id;
msg->target = p_method;
msg->type = TYPE_CALL;
if (p_show_error)
msg->type |= FLAG_SHOW_ERROR;
buffer_end += sizeof(Message);
for (int i = 0; i < p_argcount; i++) {
Variant *v = memnew_placement(&buffer[buffer_end], Variant);
buffer_end += sizeof(Variant);
*v = *p_args[i];
}
return OK;
}
Error MessageQueue::push_call(ObjectID p_id, const StringName &p_method, VARIANT_ARG_DECLARE) {
VARIANT_ARGPTRS;
int argc = 0;
for (int i = 0; i < VARIANT_ARG_MAX; i++) {
if (argptr[i]->get_type() == Variant::NIL)
break;
argc++;
}
return push_call(p_id, p_method, argptr, argc, false);
}
Error MessageQueue::push_set(ObjectID p_id, const StringName &p_prop, const Variant &p_value) {
_THREAD_SAFE_METHOD_
uint8_t room_needed = sizeof(Message) + sizeof(Variant);
if ((buffer_end + room_needed) >= buffer_size) {
String type;
if (ObjectDB::get_instance(p_id))
type = ObjectDB::get_instance(p_id)->get_class();
print_line("Failed set: " + type + ":" + p_prop + " target ID: " + itos(p_id));
statistics();
ERR_EXPLAIN("Message queue out of memory. Try increasing 'message_queue_size_kb' in project settings.");
ERR_FAIL_V(ERR_OUT_OF_MEMORY);
}
Message *msg = memnew_placement(&buffer[buffer_end], Message);
msg->args = 1;
msg->instance_id = p_id;
msg->target = p_prop;
msg->type = TYPE_SET;
buffer_end += sizeof(Message);
Variant *v = memnew_placement(&buffer[buffer_end], Variant);
buffer_end += sizeof(Variant);
*v = p_value;
return OK;
}
Error MessageQueue::push_notification(ObjectID p_id, int p_notification) {
_THREAD_SAFE_METHOD_
ERR_FAIL_COND_V(p_notification < 0, ERR_INVALID_PARAMETER);
uint8_t room_needed = sizeof(Message);
if ((buffer_end + room_needed) >= buffer_size) {
String type;
if (ObjectDB::get_instance(p_id))
type = ObjectDB::get_instance(p_id)->get_class();
print_line("Failed notification: " + itos(p_notification) + " target ID: " + itos(p_id));
statistics();
ERR_EXPLAIN("Message queue out of memory. Try increasing 'message_queue_size_kb' in project settings.");
ERR_FAIL_V(ERR_OUT_OF_MEMORY);
}
Message *msg = memnew_placement(&buffer[buffer_end], Message);
msg->type = TYPE_NOTIFICATION;
msg->instance_id = p_id;
//msg->target;
msg->notification = p_notification;
buffer_end += sizeof(Message);
return OK;
}
Error MessageQueue::push_call(Object *p_object, const StringName &p_method, VARIANT_ARG_DECLARE) {
return push_call(p_object->get_instance_id(), p_method, VARIANT_ARG_PASS);
}
Error MessageQueue::push_notification(Object *p_object, int p_notification) {
return push_notification(p_object->get_instance_id(), p_notification);
}
Error MessageQueue::push_set(Object *p_object, const StringName &p_prop, const Variant &p_value) {
return push_set(p_object->get_instance_id(), p_prop, p_value);
}
void MessageQueue::statistics() {
Map<StringName, int> set_count;
Map<int, int> notify_count;
Map<StringName, int> call_count;
int null_count = 0;
uint32_t read_pos = 0;
while (read_pos < buffer_end) {
Message *message = (Message *)&buffer[read_pos];
Object *target = ObjectDB::get_instance(message->instance_id);
if (target != NULL) {
switch (message->type & FLAG_MASK) {
case TYPE_CALL: {
if (!call_count.has(message->target))
call_count[message->target] = 0;
call_count[message->target]++;
} break;
case TYPE_NOTIFICATION: {
if (!notify_count.has(message->notification))
notify_count[message->notification] = 0;
notify_count[message->notification]++;
} break;
case TYPE_SET: {
if (!set_count.has(message->target))
set_count[message->target] = 0;
set_count[message->target]++;
} break;
}
} else {
//object was deleted
print_line("Object was deleted while awaiting a callback");
null_count++;
}
read_pos += sizeof(Message);
if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION)
read_pos += sizeof(Variant) * message->args;
}
print_line("TOTAL BYTES: " + itos(buffer_end));
print_line("NULL count: " + itos(null_count));
for (Map<StringName, int>::Element *E = set_count.front(); E; E = E->next()) {
print_line("SET " + E->key() + ": " + itos(E->get()));
}
for (Map<StringName, int>::Element *E = call_count.front(); E; E = E->next()) {
print_line("CALL " + E->key() + ": " + itos(E->get()));
}
for (Map<int, int>::Element *E = notify_count.front(); E; E = E->next()) {
print_line("NOTIFY " + itos(E->key()) + ": " + itos(E->get()));
}
}
int MessageQueue::get_max_buffer_usage() const {
return buffer_max_used;
}
void MessageQueue::_call_function(Object *p_target, const StringName &p_func, const Variant *p_args, int p_argcount, bool p_show_error) {
const Variant **argptrs = NULL;
if (p_argcount) {
argptrs = (const Variant **)alloca(sizeof(Variant *) * p_argcount);
for (int i = 0; i < p_argcount; i++) {
argptrs[i] = &p_args[i];
}
}
Variant::CallError ce;
p_target->call(p_func, argptrs, p_argcount, ce);
if (p_show_error && ce.error != Variant::CallError::CALL_OK) {
ERR_PRINTS("Error calling deferred method: " + Variant::get_call_error_text(p_target, p_func, argptrs, p_argcount, ce));
}
}
void MessageQueue::flush() {
if (buffer_end > buffer_max_used) {
buffer_max_used = buffer_end;
}
uint32_t read_pos = 0;
//using reverse locking strategy
_THREAD_SAFE_LOCK_
ERR_FAIL_COND(flushing); //already flushing, you did something odd
flushing = true;
while (read_pos < buffer_end) {
//lock on each iteration, so a call can re-add itself to the message queue
Message *message = (Message *)&buffer[read_pos];
uint32_t advance = sizeof(Message);
if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION)
advance += sizeof(Variant) * message->args;
//pre-advance so this function is reentrant
read_pos += advance;
_THREAD_SAFE_UNLOCK_
Object *target = ObjectDB::get_instance(message->instance_id);
if (target != NULL) {
switch (message->type & FLAG_MASK) {
case TYPE_CALL: {
Variant *args = (Variant *)(message + 1);
// messages don't expect a return value
_call_function(target, message->target, args, message->args, message->type & FLAG_SHOW_ERROR);
} break;
case TYPE_NOTIFICATION: {
// messages don't expect a return value
target->notification(message->notification);
} break;
case TYPE_SET: {
Variant *arg = (Variant *)(message + 1);
// messages don't expect a return value
target->set(message->target, *arg);
} break;
}
}
if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
Variant *args = (Variant *)(message + 1);
for (int i = 0; i < message->args; i++) {
args[i].~Variant();
}
}
message->~Message();
_THREAD_SAFE_LOCK_
}
buffer_end = 0; // reset buffer
flushing = false;
_THREAD_SAFE_UNLOCK_
}
bool MessageQueue::is_flushing() const {
return flushing;
}
MessageQueue::MessageQueue() {
ERR_FAIL_COND(singleton != NULL);
singleton = this;
flushing = false;
buffer_end = 0;
buffer_max_used = 0;
buffer_size = GLOBAL_DEF_RST("memory/limits/message_queue/max_size_kb", DEFAULT_QUEUE_SIZE_KB);
ProjectSettings::get_singleton()->set_custom_property_info("memory/limits/message_queue/max_size_kb", PropertyInfo(Variant::INT, "memory/limits/message_queue/max_size_kb", PROPERTY_HINT_RANGE, "0,2048,1,or_greater"));
buffer_size *= 1024;
buffer = memnew_arr(uint8_t, buffer_size);
}
MessageQueue::~MessageQueue() {
uint32_t read_pos = 0;
while (read_pos < buffer_end) {
Message *message = (Message *)&buffer[read_pos];
Variant *args = (Variant *)(message + 1);
int argc = message->args;
if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
for (int i = 0; i < argc; i++)
args[i].~Variant();
}
message->~Message();
read_pos += sizeof(Message);
if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION)
read_pos += sizeof(Variant) * message->args;
}
singleton = NULL;
memdelete_arr(buffer);
}
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