1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524
//! The simulator module provides the mechanics to orchestrate the models and //! connectors via discrete event simulation. The specific formalism for //! simulation execution is the Discrete Event System Specification. User //! interaction is also captured in this module - simulation stepping and //! input injection. //! //! `Simulation` and `WebSimulation` are used for Rust- and npm-based //! projects, respectively. The `Simulation` methods use the associated //! struct types directly, while the `WebSimulation` provides an interface //! with better JS/WASM compatibility. //! //! Most simulation analysis will involve the collection, transformation, //! and analysis of messages. The `step`, `step_n`, and `step_until` methods //! return the messages generated during the execution of the simulation //! step(s), for use in message analysis. use std::f64::INFINITY; use js_sys::Array; use serde::{Deserialize, Serialize}; use wasm_bindgen::prelude::*; use crate::input_modeling::UniformRNG; use crate::models::{AsModel, Model, ModelMessage}; use crate::utils; use crate::utils::error::SimulationError; #[cfg(test)] mod test_simulations; /// The `Simulation` struct is the core of sim, and includes everything /// needed to run a simulation - models, connectors, and a random number /// generator. State information, specifically global time and active /// messages are additionally retained in the struct. #[derive(Clone, Default, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct Simulation { models: Vec<Model>, connectors: Vec<Connector>, messages: Vec<Message>, global_time: f64, #[serde(skip_serializing)] uniform_rng: UniformRNG, } /// Connectors are configured to connect models through their ports. During /// simulation, models exchange messages (as per the Discrete Event System /// Specification) via these connectors. #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct Connector { id: String, #[serde(rename = "sourceID")] source_id: String, #[serde(rename = "targetID")] target_id: String, source_port: String, target_port: String, } /// Messages are the mechanism of information exchange for models in a /// a simulation. The message must contain origin information (source model /// ID and source model port), destination information (target model ID and /// target model port), and the text/content of the message. #[wasm_bindgen] #[derive(Clone, Debug, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct Message { source_id: String, source_port: String, target_id: String, target_port: String, time: f64, message: String, } impl Simulation { /// This constructor method creates a simulation from a supplied /// configuration (models and connectors). pub fn post(models: Vec<Model>, connectors: Vec<Connector>) -> Self { utils::set_panic_hook(); Self { models, connectors, ..Self::default() } } /// This method sets the models and connectors of an existing simulation. pub fn put(&mut self, models: Vec<Model>, connectors: Vec<Connector>) { self.models = models; self.connectors = connectors; } /// Simulation steps generate messages, which are then consumed on /// subsequent simulation steps. These messages between models in a /// simulation drive much of the discovery, analysis, and design. This /// accessor method provides the list of active messages, at the current /// point of time in the simulation. Message history is not retained, so /// simulation products and projects should collect messages as needed /// throughout the simulation execution. pub fn get_messages(&self) -> &Vec<Message> { &self.messages } /// An accessor method for the simulation global time. pub fn get_global_time(&self) -> f64 { self.global_time } /// This method provides a mechanism for getting the status of any model /// in a simulation. The method takes the model ID as an argument, and /// returns the current status string for that model. pub fn status(&self, model_id: &str) -> Result<String, SimulationError> { Ok(self .models .iter() .find(|model| model.id() == model_id) .ok_or_else(|| SimulationError::ModelNotFound)? .status()) } /// To enable simulation replications, the reset method resets the state /// of the simulation, except for the random number generator. /// Recreating a simulation from scratch for additional replications /// does not work, due to the random number generator seeding. pub fn reset(&mut self) { self.reset_messages(); self.reset_global_time(); } /// Clear the active messages in a simulation. pub fn reset_messages(&mut self) { self.messages = Vec::new(); } /// Reset the simulation global time to 0.0. pub fn reset_global_time(&mut self) { self.global_time = 0.0; } /// This method provides a convenient foundation for operating on the /// full set of models in the simulation. pub fn models(&mut self) -> Vec<&mut Model> { self.models.iter_mut().collect() } /// This method constructs a list of target IDs for a given source model /// ID and port. This message target information is derived from the /// connectors configuration. fn get_message_target_ids(&self, source_id: &str, source_port: &str) -> Vec<String> { self.connectors .iter() .filter_map(|connector| { if connector.source_id == source_id && connector.source_port == source_port { Some(connector.target_id.to_string()) } else { None } }) .collect() } /// This method constructs a list of target ports for a given source model /// ID and port. This message target information is derived from the /// connectors configuration. fn get_message_target_ports(&self, source_id: &str, source_port: &str) -> Vec<String> { self.connectors .iter() .filter_map(|connector| { if connector.source_id == source_id && connector.source_port == source_port { Some(connector.target_port.to_string()) } else { None } }) .collect() } /// Input injection creates a message during simulation execution, /// without needing to create that message through the standard /// simulation constructs. This enables live simulation interaction, /// disruption, and manipulation - all through the standard simulation /// message system. pub fn inject_input(&mut self, message: Message) { self.messages.push(message); } /// The simulation step is foundational for a discrete event simulation. /// This method executes a single discrete event simulation step, /// including internal state transitions, external state transitions, /// message orchestration, global time accounting, and step messages /// output. pub fn step(&mut self) -> Result<Vec<Message>, SimulationError> { let messages = self.messages.clone(); let mut next_messages: Vec<Message> = Vec::new(); // Process external events and gather associated messages if !messages.is_empty() { let errors: Result<(), SimulationError> = (0..self.models.len()) .map(|model_index| -> Result<(), SimulationError> { let model_messages: Vec<ModelMessage> = messages .iter() .filter_map(|message| { if message.target_id == self.models[model_index].id() { Some(ModelMessage { port_name: message.target_port.clone(), message: message.message.clone(), }) } else { None } }) .collect(); model_messages .iter() .map(|model_message| -> Result<(), SimulationError> { self.models[model_index] .events_ext(&mut self.uniform_rng, model_message.clone())? .iter() .for_each(|outgoing_message| { let target_ids = self.get_message_target_ids( &self.models[model_index].id(), // Outgoing message source model ID &outgoing_message.port_name, // Outgoing message source model port ); let target_ports = self.get_message_target_ports( &self.models[model_index].id(), // Outgoing message source model ID &outgoing_message.port_name, // Outgoing message source model port ); target_ids.iter().zip(target_ports.iter()).for_each( |(target_id, target_port)| { next_messages.push(Message { source_id: self.models[model_index] .id() .to_string(), source_port: outgoing_message.port_name.clone(), target_id: target_id.clone(), target_port: target_port.clone(), time: self.global_time, message: outgoing_message.message.clone(), }); }, ); }); Ok(()) }) .collect() }) .collect(); errors?; } // Process internal events and gather associated messages let until_next_event: f64; if self.messages.is_empty() { until_next_event = self.models().iter().fold(INFINITY, |min, model| { f64::min(min, model.until_next_event()) }); } else { until_next_event = 0.0; } self.models().iter_mut().for_each(|model| { model.time_advance(until_next_event); }); self.global_time += until_next_event; let errors: Result<Vec<()>, SimulationError> = (0..self.models.len()) .map(|model_index| -> Result<(), SimulationError> { self.models[model_index] .events_int(&mut self.uniform_rng)? .iter() .for_each(|outgoing_message| { let target_ids = self.get_message_target_ids( &self.models[model_index].id(), // Outgoing message source model ID &outgoing_message.port_name, // Outgoing message source model port ); let target_ports = self.get_message_target_ports( &self.models[model_index].id(), // Outgoing message source model ID &outgoing_message.port_name, // Outgoing message source model port ); target_ids.iter().zip(target_ports.iter()).for_each( |(target_id, target_port)| { next_messages.push(Message { source_id: self.models[model_index].id().to_string(), source_port: outgoing_message.port_name.clone(), target_id: target_id.clone(), target_port: target_port.clone(), time: self.global_time, message: outgoing_message.message.clone(), }); }, ); }); Ok(()) }) .collect(); errors?; self.messages = next_messages; Ok(self.get_messages().to_vec()) } /// This method executes simulation `step` calls, until a global time /// has been exceeded. At which point, the messages from all the /// simulation steps are returned. pub fn step_until(&mut self, until: f64) -> Result<Vec<Message>, SimulationError> { let mut message_records: Vec<Message> = Vec::new(); loop { self.step()?; if self.global_time < until { message_records.extend(self.get_messages().clone()); } else { break; } } Ok(message_records) } /// This method executes the specified number of simulation steps, `n`. /// Upon execution of the n steps, the messages from all the steps are /// returned. fn step_n(&mut self, n: usize) -> Result<Vec<Message>, SimulationError> { let mut message_records: Vec<Message> = Vec::new(); (0..n) .map(|_| -> Result<Vec<Message>, SimulationError> { self.step()?; message_records.extend(self.messages.clone()); Ok(Vec::new()) }) .find(|result| result.is_err()) .unwrap_or(Ok(message_records)) } } /// The `WebSimulation` provides JS/WASM-compatible interfaces to the core /// `Simulation` struct. For additional insight on these methods, refer to /// the associated `Simulation` methods. Errors are unwrapped, instead of /// returned, in the `WebSimulation` methods. #[wasm_bindgen] #[derive(Default, Serialize, Deserialize)] pub struct WebSimulation { simulation: Simulation, } #[wasm_bindgen] impl WebSimulation { /// A JS/WASM interface for `Simulation.post`, which uses JSON /// representations of the simulation models and connectors. pub fn post_json(models: &str, connectors: &str) -> Self { utils::set_panic_hook(); Self { simulation: Simulation { models: serde_json::from_str(models).unwrap(), connectors: serde_json::from_str(connectors).unwrap(), ..Simulation::default() }, } } /// A JS/WASM interface for `Simulation.put`, which uses JSON /// representations of the simulation models and connectors. pub fn put_json(&mut self, models: &str, connectors: &str) { self.simulation.models = serde_json::from_str(models).unwrap(); self.simulation.connectors = serde_json::from_str(connectors).unwrap(); } /// Get a JSON representation of the full `Simulation` configuration. pub fn get_json(&self) -> String { serde_json::to_string_pretty(&self.simulation).unwrap() } /// A JS/WASM interface for `Simulation.post`, which uses YAML /// representations of the simulation models and connectors. pub fn post_yaml(models: &str, connectors: &str) -> WebSimulation { utils::set_panic_hook(); Self { simulation: Simulation { models: serde_yaml::from_str(models).unwrap(), connectors: serde_yaml::from_str(connectors).unwrap(), ..Simulation::default() }, } } /// A JS/WASM interface for `Simulation.put`, which uses YAML /// representations of the simulation models and connectors. pub fn put_yaml(&mut self, models: &str, connectors: &str) { self.simulation.models = serde_yaml::from_str(models).unwrap(); self.simulation.connectors = serde_yaml::from_str(connectors).unwrap(); } /// Get a YAML representation of the full `Simulation` configuration. pub fn get_yaml(&self) -> String { serde_yaml::to_string(&self.simulation).unwrap() } /// A JS/WASM interface for `Simulation.get_messages`, which converts the /// messages to a JavaScript Array. pub fn get_messages_js(&self) -> Array { // Workaround for https://github.com/rustwasm/wasm-bindgen/issues/111 self.simulation .get_messages() .clone() .into_iter() .map(JsValue::from) .collect() } /// A JS/WASM interface for `Simulation.get_messages`, which converts the /// messages to a JSON string. pub fn get_messages_json(&self) -> String { serde_json::to_string(&self.simulation.get_messages()).unwrap() } /// A JS/WASM interface for `Simulation.get_messages`, which converts the /// messages to a YAML string. pub fn get_messages_yaml(&self) -> String { serde_yaml::to_string(&self.simulation.get_messages()).unwrap() } /// An interface to `Simulation.get_global_time`. pub fn get_global_time(&self) -> f64 { self.simulation.get_global_time() } /// An interface to `Simulation.status`. pub fn status(&self, model_id: &str) -> String { self.simulation.status(model_id).unwrap() } /// An interface to `Simulation.reset`. pub fn reset(&mut self) { self.simulation.reset(); } /// An interface to `Simulation.reset_messages`. pub fn reset_messages(&mut self) { self.simulation.reset_messages(); } /// An interface to `Simulation.reset_global_time` pub fn reset_global_time(&mut self) { self.simulation.reset_global_time(); } /// A JS/WASM interface for `Simulation.inject_input`, which uses a JSON /// representation of the injected messages. pub fn inject_input_json(&mut self, message: &str) { self.simulation .inject_input(serde_json::from_str(message).unwrap()); } /// A JS/WASM interface for `Simulation.inject_input`, which uses a YAML /// representation of the injected messages. pub fn inject_input_yaml(&mut self, message: &str) { self.simulation .inject_input(serde_yaml::from_str(message).unwrap()); } /// A JS/WASM interface for `Simulation.step`, which converts the /// returned messages to a JavaScript Array. pub fn step_js(&mut self) -> Array { self.simulation .step() .unwrap() .into_iter() .map(JsValue::from) .collect() } /// A JS/WASM interface for `Simulation.step`, which converts the /// returned messages to a JSON string. pub fn step_json(&mut self) -> String { serde_json::to_string(&self.simulation.step().unwrap()).unwrap() } /// A JS/WASM interface for `Simulation.step`, which converts the /// returned messages to a YAML string. pub fn step_yaml(&mut self) -> String { serde_yaml::to_string(&self.simulation.step().unwrap()).unwrap() } /// A JS/WASM interface for `Simulation.step_until`, which converts the /// returned messages to a JavaScript Array. pub fn step_until_js(&mut self, until: f64) -> Array { self.simulation .step_until(until) .unwrap() .into_iter() .map(JsValue::from) .collect() } /// A JS/WASM interface for `Simulation.step_until`, which converts the /// returned messages to a JSON string. pub fn step_until_json(&mut self, until: f64) -> String { serde_json::to_string(&self.simulation.step_until(until).unwrap()).unwrap() } /// A JS/WASM interface for `Simulation.step_until`, which converts the /// returned messages to a YAML string. pub fn step_until_yaml(&mut self, until: f64) -> String { serde_yaml::to_string(&self.simulation.step_until(until).unwrap()).unwrap() } /// A JS/WASM interface for `Simulation.step_n`, which converts the /// returned messages to a JavaScript Array. pub fn step_n_js(&mut self, n: usize) -> Array { self.simulation .step_n(n) .unwrap() .into_iter() .map(JsValue::from) .collect() } /// A JS/WASM interface for `Simulation.step_n`, which converts the /// returned messages to a JSON string. pub fn step_n_json(&mut self, n: usize) -> String { serde_json::to_string(&self.simulation.step_n(n).unwrap()).unwrap() } /// A JS/WASM interface for `Simulation.step_n`, which converts the /// returned messages to a YAML string. pub fn step_n_yaml(&mut self, n: usize) -> String { serde_yaml::to_string(&self.simulation.step_n(n).unwrap()).unwrap() } }