LDIO Change Detection Filter

Ldio:ChangeDetectionFilter

The LDIO Change Detection Filter, which is in fact a transformer, keeps track of each member with the same subject if the state has changed. If not, the member will be ignored, otherwise the member will be sent further through the pipeline. This can come in handy when you do not want to spam your server for example with duplicate state objects.

Flow of the Change Detection Filter

flowchart LR
;
    PREV_TRANSFORMER[Previous transformer] --> State_Object((State\n object));
    State_Object --> FILTER(Change Detection\nFilter);
    FILTER --> HASH((Hashed\n model))
    HASH --> Filtering{Contains\n member with\n same subject and\n same hashed\n model?};
    Filtering -->|No| NEXT_TRANSFORMER[Next\n transformer];
    Filtering -->|Yes| Ignore[Ignore member];

Config

General properties

Property	Description	Required	Default	Example	Supported values
state	‘memory’, ‘sqlite’ or ‘postgres’ to indicate how the state should be persisted	No	memory	sqlite	‘memory’, ‘sqlite’ or ‘postgres’
keep-state	Indicates if the state should be persisted on shutdown (n/a for in memory states)	No	false	false	true or false

SQLite properties

Property	Description	Required	Default	Example	Supported values
sqlite.directory	Directory wherein the .db file can be saved	No	N/A	/ldio/sqlite	String

Postgres properties

Property	Description	Required	Default	Example	Supported values
postgres.url	JDBC URL of the Postgres database	No	N/A	jdbc:postgresql://test.postgres.database.azure.com:5432/sample	String
postgres.username	Username used to connect to Postgres database	No	N/A	myUsername@test	String
postgres.password	Password used to connect to Postgres database	No	N/A	myPassword	String