Constants and enumerations.
These modules provide utility functions, constants, and enumerations.
Constants and Enumerations (matlab/src/lang/constant/)
The constants module defines enumerations and global constants used throughout the LINE Solver package.
Scheduling Strategies (SchedStrategy)
| Constant | Description |
| FCFS | First-Come First-Served |
| LCFS | Last-Come First-Served (non-preemptive) |
| LCFSPR | Last-Come First-Served Preemptive-Resume |
| LCFSPI | Last-Come First-Served Preemptive-Independent |
| PS | Processor Sharing (egalitarian) |
| DPS | Discriminatory Processor Sharing |
| GPS | Generalized Processor Sharing |
| INF | Infinite Server (delay station) |
| HOL | Head-of-Line priority (non-preemptive) |
| SJF | Shortest Job First |
| LJF | Longest Job First |
| SEPT | Shortest Expected Processing Time |
| LEPT | Longest Expected Processing Time |
| SIRO | Service In Random Order |
| POLLING | Polling-based service |
| EXT | External (arrivals from outside) |
| FORK | Fork behavior |
| REF | Reference (for reference stations) |
Routing Strategies (RoutingStrategy)
| Constant | Description |
| DISABLED | Routing disabled |
| FIRING | Petri net transition firing |
| JSQ | Join Shortest Queue |
| KCHOICES | Power of k choices |
| PROB | Probabilistic routing |
| RAND | Random (uniform) routing |
| RL | Reinforcement learning routing |
| RROBIN | Round-robin routing |
| WRROBIN | Weighted round-robin |
Process Types (ProcessType)
| Constant | Description |
| EXP | Exponential |
| ERLANG | Erlang |
| HYPEREXP | Hyperexponential |
| APH | Acyclic Phase-Type |
| PH | Phase-Type |
| COXIAN | Coxian |
| DET | Deterministic |
| UNIFORM | Uniform |
| GAMMA | Gamma |
| PARETO | Pareto |
| WEIBULL | Weibull |
| LOGNORMAL | Log-normal |
| MAP | Markovian Arrival Process |
| MMPP2 | Two-state MMPP |
| REPLAYER | Trace replayer |
| TRACE | Generic trace |
| DISABLED | Disabled process |
| IMMEDIATE | Instantaneous |
Node Types (NodeType)
| Constant | Description |
| SOURCE | Arrival source |
| SINK | Departure sink |
| QUEUE | Service queue |
| DELAY | Infinite server station |
| ROUTER | Routing node |
| FORK | Fork node |
| JOIN | Join node |
| CACHE | Cache station |
| CLASSSWITCH | Class-switching node |
| LOGGER | Logging node |
| PLACE | Petri net place |
| TRANSITION | Petri net transition |
Job Class Types (JobClassType)
| Constant | Description |
| OPEN | Open class (external arrivals) |
| CLOSED | Closed class (fixed population) |
| DISABLED | Disabled class |
Service Strategies (ServiceStrategy)
| Constant | Description |
| LI | Load-Independent service |
| LD | Load-Dependent service |
Solver Types (SolverType)
| Constant | Description |
| MVA | Mean Value Analysis |
| CTMC | Continuous-Time Markov Chain |
| FLUID | Fluid approximation |
| MAM | Matrix-Analytic Methods |
| NC | Normalizing Constant |
| SSA | Stochastic Simulation Algorithm |
| JMT | Java Modelling Tools |
| AUTO | Automatic selection |
| LQNS | Layered QN Solver |
| QNS | QN Solver |
| LN | Layered Network |
| ENV | Random Environment |
Metric Types (MetricType)
| Constant | Description |
| ArvR | Arrival rate |
| DropRate | Drop rate |
| FCRMemOcc | FCR memory occupation |
| FCRWeight | FCR total weight |
| FJQLen | Fork-join number of customers |
| FJRespT | Fork-join response time |
| QLen | Number of customers (queue length) |
| QueueT | Queue time |
| ResidT | Residence time |
| RespT | Response time |
| RespTSink | Response time per sink |
| SysDropR | System drop rate |
| SysPower | System power |
| SysQLen | System number of customers |
| SysRespT | System response time |
| SysTput | System throughput |
| Tput | Throughput |
| TputSink | Throughput per sink |
| TranQLen | Transient number of customers |
| TranRespT | Transient response time |
| TranTput | Transient throughput |
| TranUtil | Transient utilization |
| Util | Utilization |
Drop Strategies (DropStrategy)
| Constant | Description |
| WAITQ | Waiting queue (infinite buffer) |
| DROP | Drop arriving customers when full |
| BAS | Blocking after service |
Replacement Strategies (ReplacementStrategy)
| Constant | Description |
| LRU | Least Recently Used |
| FIFO | First-In First-Out |
| RR | Random Replacement |
| SFIFO | Static FIFO |
| MRU | Most Recently Used |
| LFU | Least Frequently Used |
Join Strategies (JoinStrategy)
| Constant | Description |
| STD | Standard join (wait for all) |
| PARTIAL | Partial join (k-of-n) |
| GUARD | Guarded join |
Call Types (CallType)
| Constant | Description |
| SYNC | Synchronous call |
| ASYNC | Asynchronous call |
Activity Precedence Types (ActivityPrecedenceType)
| Constant | Description |
| PRE_SEQ | Sequential precedence |
| PRE_AND | AND split/join |
| PRE_OR | OR split/join |
| POST_SEQ | Post-sequential |
| POST_AND | Post-AND |
| POST_OR | Post-OR |
| POST_LOOP | Post-loop |
Polling Types (PollingType)
| Constant | Description |
| EXHAUSTIVE | Exhaustive polling |
| GATED | Gated polling |
| KLIMITED | K-limited polling |
Verbose Levels (VerboseLevel)
| Constant | Description |
| SILENT | No output |
| STD | Standard output |
| DEBUG | Debug output |
GlobalConstants
The GlobalConstants class provides global configuration options:
| Property | Description |
| CoarseTol | Coarse tolerance for comparisons (default: 1e-3) |
| FineTol | Fine tolerance for comparisons (default: 1e-6) |
| Zero | Near-zero threshold (default: 1e-14) |
| Immediate | Immediate service rate (default: Inf) |
| MaxInt | Maximum integer value (default: 2147483647) |
Usage Examples
Setting Scheduling Strategy
model = Network('Example');
queue = Queue(model, 'Queue1', SchedStrategy.PS); % Processor Sharing
Setting Routing Strategy
model.link(Network.serialRouting(source, queue, sink));
% or use probabilistic routing
P = model.initRoutingMatrix();
P{class1}(source, queue) = 1.0;
P{class1}(queue, sink) = 1.0;
Setting Distribution Type
queue.setService(jobclass, Exp(1.0)); % Exponential
queue.setService(jobclass, Erlang(2, 0.5)); % Erlang
queue.setService(jobclass, HyperExp([0.5 0.5], [1.0 2.0])); % Hyperexponential
