forked from sanultari/gollum
/
null.go
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/
null.go
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// Copyright 2015-2016 trivago GmbH
//
// Licensed 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 producer
import (
"github.com/trivago/gollum/core"
"github.com/trivago/gollum/shared"
"sync"
"time"
)
// Null producer plugin
// This producer does nothing and provides only bare-bone configuration (i.e.
// enabled and streams). Use this producer to test consumer performance.
// This producer does not implement a fuse breaker.
type Null struct {
control chan core.PluginControl
streams []core.MessageStreamID
}
func init() {
shared.TypeRegistry.Register(Null{})
}
// Configure initializes the basic members
func (prod *Null) Configure(conf core.PluginConfig) error {
prod.control = make(chan core.PluginControl, 1)
prod.streams = make([]core.MessageStreamID, len(conf.Stream))
for i, stream := range conf.Stream {
prod.streams[i] = core.StreamRegistry.GetStreamID(stream)
}
return nil
}
// GetState always returns PluginStateActive
func (prod *Null) GetState() core.PluginState {
return core.PluginStateActive
}
// IsActive always returns true
func (prod *Null) IsActive() bool {
return true
}
// IsBlocked always returns false
func (prod *Null) IsBlocked() bool {
return false
}
// Streams returns the streams this producer is listening to.
func (prod *Null) Streams() []core.MessageStreamID {
return prod.streams
}
// GetDropStreamID returns the id of the stream to drop messages to.
func (prod *Null) GetDropStreamID() core.MessageStreamID {
return core.DroppedStreamID
}
// AddDependency is an empty call because null does not support them
func (prod *Null) AddDependency(dep core.Producer) {
}
// DependsOn always returns false
func (prod *Null) DependsOn(dep core.Producer) bool {
return false
}
// Control returns write access to this producer's control channel.
func (prod *Null) Control() chan<- core.PluginControl {
return prod.control
}
// Enqueue simply ignores the message
func (prod *Null) Enqueue(msg core.Message, timeout *time.Duration) {
}
// Produce writes to a buffer that is dumped to a file.
func (prod *Null) Produce(threads *sync.WaitGroup) {
for {
command := <-prod.control
if command == core.PluginControlStopConsumer {
return // ### return ###
}
}
}