youtubebeat/vendor/github.com/elastic/beats/libbeat/outputs/observer.go

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2018-11-18 11:08:38 +01:00
// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package outputs
// Observer provides an interface used by outputs to report common events on
// documents/events being published and I/O workload.
type Observer interface {
NewBatch(int) // report new batch being processed with number of events
Acked(int) // report number of acked events
Failed(int) // report number of failed events
Dropped(int) // report number of dropped events
Duplicate(int) // report number of events detected as duplicates (e.g. on resends)
Cancelled(int) // report number of cancelled events
WriteError(error) // report an I/O error on write
WriteBytes(int) // report number of bytes being written
ReadError(error) // report an I/O error on read
ReadBytes(int) // report number of bytes being read
}
type emptyObserver struct{}
var nilObserver = (*emptyObserver)(nil)
// NewNilObserver returns an oberserver implementation, ignoring all events.
func NewNilObserver() Observer {
return nilObserver
}
func (*emptyObserver) NewBatch(int) {}
func (*emptyObserver) Acked(int) {}
func (*emptyObserver) Duplicate(int) {}
func (*emptyObserver) Failed(int) {}
func (*emptyObserver) Dropped(int) {}
func (*emptyObserver) Cancelled(int) {}
func (*emptyObserver) WriteError(error) {}
func (*emptyObserver) WriteBytes(int) {}
func (*emptyObserver) ReadError(error) {}
func (*emptyObserver) ReadBytes(int) {}