ArchitectureDescription

MiSim architecture descriptions consist out of a list of microservice descriptions and and an optional definition of default Network latency.

{
    "network_latency": <Distribution Experssion>,
    "microservices": [
        List<Microservice Description>
    ]
}

Distribution Expression

To model distirbutions MiSim supports a simple distribution expression. It shapes a normal distirbutions with a mean and a standard deviation. Optionally, the left and right deviation can be specified seperately.

Type	Formula	Example
Constant	<const>	"42"
Normal dDistribution	<mean>+-<std>	"42+-3"
Skewed Distribution	<mean>+<leftDeviation>-<rightDeviation>	"42+1-3"

Microservice Description

Property	Description
name	The name of the microservice
instances	The number of starting instances of the microservice
capacity	Capacity of each instance
loadbalancer_strategy	The load balancing strategies to use.*
patterns	List of instance owned pattern descriptions that should be used.*
s_patterns	List of service owned pattern descriptions that should be used.*
operations	List of operation descriptions

* See Supported Resilience Mechanisms.

Example

{
    "name": "MyMicroservice",
    "instances": 1,
    "capacity": 1000,
    "loadbalancer_strategy": "round_robin",
    "patterns": [
        List<Pattern Description>
    ],
    "s_patterns": [
        List<Pattern Description>
    ],
    "operations": [
        List<Operation Description>
    ]
}

Operation Description

Property	Description
name	The name of the operation.
demand	The computational demand of the operation.
dependencies	List of Dependencie descriptions.

Example

{
    "name": "MyOperation",
    "demand": 1000,
    "dependencies": [
        List<Dependency Description>
    ]
}

Dependency Description

Property	Description
service	Target service name
operation	Target operation name
proability	Probability of the dependency to be needed.
custom_delay	Custom latency to be used. Overrides default network latency

Service and operation name can also be combined as fully qualifed name in the operation property, e.g. "service.operation".

Example

{
    "service": "MyService",
    "operation": "MyOperation",
    "probability": 0.5,
    "custom_delay": <Distribution Expression>
}