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createServicePolicy: Convert callbacks to methods (#5188)
Both RetryPolicy and CircuitBreakerPolicy from the Cockatiel library
allow for listening for events using `on*` methods. For instance, if you
have a retry policy, you can listen for when the function is retried
like so:
``` typescript
retryPolicy.onRetry(() => {
// ...
})
```
Our "service policy" allows for listening to some of the same events as
well as the "degraded" event. Instead of exposing `on*` methods,
however, `createServicePolicy` takes callbacks in an options bag:
``` typescript
createServicePolicy({
// ...
onRetry: () => {
// ...
}
)
```
For parity with Cockatiel — and for easier use in general — this commit
changes the API so that the object that `createServicePolicy` returns
now includes similar `on*` methods. This way you can say:
``` typescript
const policy = createServicePolicy({ ... });
policy.onRetry(() => {
// ...
});
```- Loading branch information
