Sequence: Opt Block

Optional block — executes only if condition is met.

Conditional Block

sequence-opt-block.mmd

sequenceDiagram
  participant A as App
  participant C as Cache
  participant DB as Database
  A->>C: Get data
  C-->>A: Cache miss
  opt Cache miss
    A->>DB: Query
    DB-->>A: Results
    A->>C: Store in cache
  end

Output

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More Sequence diagram examples

Sequence: Basic Messages

Sequence: Participant Aliases

Sequence: Actor Stick Figures

Sequence: Arrow Types

Sequence: Activation Boxes

Sequence: Self-Messages