CloudWatchCounters

Performance counters that periodically dump counters to AWS Cloud Watch Metrics.

Implements: CachedCounters, IConfigurable, IReferenceable

Description

The CloudWatchCounters class allows you to create performance counters that periodically dump counters to AWS Cloud Watch Metrics.

Configuration parameters

  • connections:
    • discovery_key: (optional) key to retrieve the connection from IDiscovery
    • region: (optional) AWS region
  • credentials:
    • store_key: (optional) key to retrieve the credentials from ICredentialStore
    • access_id: AWS access/client id
    • access_key: AWS access/client key
  • options:
    • interval: interval in milliseconds to save current counters measurements (default: 5 mins)
    • reset_timeout: timeout in milliseconds to reset the counters. 0 disables the reset (default: 0)

References

  • *:context-info:*:*:1.0 - (optional) ContextInfo to detect the context id and specify the counters' source
  • *:discovery:*:*:1.0 - (optional) IDiscovery services to resolve connections
  • *:credential-store:*:*:1.0 - (optional) credential stores to resolve credentials requests

Constructors

Creates a new instance of this counters.

CloudWatchCounters()

Instance methods

close

Closes component and frees used resources.

close(correlation_id: Optional[str])

  • correlation_id: Optional[str] - (optional) transaction id used to trace execution through the call chain.

configure

Configures a component by passing its configuration parameters.

configure(config: ConfigParams)

  • config: ConfigParams - configuration parameters to be set.

is_open

Checks if the component is open.

is_open(): bool

  • returns: bool - true if the component is open and false otherwise.

open

Opens the component.

open(correlation_id: Optional[str])

  • correlation_id: Optional[str] - (optional) transaction id used to trace execution through the call chain.

_save

Saves the current counters' measurements.

_save(counters: List[Counter])

  • counters: List[Counter] - current counters' measurements to be saved.

set_references

Sets references to dependent components.

set_references(references: IReferences)

  • references: IReferences - references to locate the component’s dependencies.

Examples

counters = CloudWatchCounters()

counters.config(ConfigParams.from_tuples(
    "connection.region", "us-east-1",
    "connection.access_id", "XXXXXXXXXXX",
    "connection.access_key", "XXXXXXXXXXX"
))

counters.set_references(References.from_tuples(
    Descriptor("pip-services", "logger", "console", "default", "1.0"),
    ConsoleLogger()
))

counters.open("123")
counters.increment("mycomponent.mymethod.calls")
timing = counters.begin_timing("mycomponent.mymethod.exec_time")

try:
    ...
except Exception as e
    timing.end_timing(e)

counters.dump();

See also