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// Tideland Go Library - Monitoring - Null Backend
//
// Copyright (C) 2009-2017 Frank Mueller / Tideland / Oldenburg / Germany
//
// All rights reserved. Use of this source code is governed
// by the new BSD license.
package monitoring
//--------------------
// IMPORTS
//--------------------
import (
"time"
)
//--------------------
// MEASURING
//--------------------
// nullMeasuring implements the Measuring interface.
type nullMeasuring struct{}
// EndMEasuring implements the Measuring interface.
func (m *nullMeasuring) EndMeasuring() time.Duration { return 0 }
//--------------------
// MEASURING POINT
//--------------------
// nullMeasuringPoint implements the MeasuringPoint interface.
type nullMeasuringPoint struct{}
// ID implements the MeasuringPoint interface.
func (mp *nullMeasuringPoint) ID() string { return "null" }
// Count implements the MeasuringPoint interface.
func (mp *nullMeasuringPoint) Count() int64 { return 0 }
// MinDuration implements the MeasuringPoint interface.
func (mp *nullMeasuringPoint) MinDuration() time.Duration { return 0 }
// MaxDuration implements the MeasuringPoint interface.
func (mp *nullMeasuringPoint) MaxDuration() time.Duration { return 0 }
// AvgDuration implements the MeasuringPoint interface.
func (mp *nullMeasuringPoint) AvgDuration() time.Duration { return 0 }
// String implements the Stringer interface.
func (mp *nullMeasuringPoint) String() string { return "Null Measuring Point" }
//--------------------
// STAY-SET VARIABLE
//--------------------
// nullStaySetVariable implements the StaySetVariable interface.
type nullStaySetVariable struct{}
// ID implements the StaySetVariable interface.
func (ssv *nullStaySetVariable) ID() string { return "null" }
// Count implements the StaySetVariable interface.
func (ssv *nullStaySetVariable) Count() int64 { return 0 }
// ActValue implements the StaySetVariable interface.
func (ssv *nullStaySetVariable) ActValue() int64 { return 0 }
// MinValue implements the StaySetVariable interface.
func (ssv *nullStaySetVariable) MinValue() int64 { return 0 }
// MaxValue implements the StaySetVariable interface.
func (ssv *nullStaySetVariable) MaxValue() int64 { return 0 }
// MinValue implements the StaySetVariable interface.
func (ssv *nullStaySetVariable) AvgValue() int64 { return 0 }
// String implements the Stringer interface.
func (ssv *nullStaySetVariable) String() string { return "Null Stay-Set Variable" }
//--------------------
// DYNAMIC STATUS RETRIEVER
//--------------------
// nullDynamicStatusValue implements the DynamicStatusValue interface.
type nullDynamicStatusValue struct{}
// ID implements the DynamicStatusValue interface.
func (dsv *nullDynamicStatusValue) ID() string { return "null" }
// Value implements the DynamicStatusValue interface.
func (dsv *nullDynamicStatusValue) Value() string { return "" }
// String implements the Stringer interface.
func (dsv *nullDynamicStatusValue) String() string { return "Null Dynamic Status Value" }
//--------------------
// MONITORING BACKEND
//--------------------
// nullBackend implements the Backend interface.
type nullBackend struct{}
// NewNullBackend starts the null monitoring backend doing nothing.
func NewNullBackend() Backend { return &nullBackend{} }
// BeginMeasuring implements the MonitorBackend interface.
func (b *nullBackend) BeginMeasuring(id string) Measuring { return &nullMeasuring{} }
// ReadMeasuringPoint implements the MonitorBackend interface.
func (b *nullBackend) ReadMeasuringPoint(id string) (MeasuringPoint, error) {
return &nullMeasuringPoint{}, nil
}
// MeasuringPointsDo implements the MonitorBackend interface.
func (b *nullBackend) MeasuringPointsDo(f func(MeasuringPoint)) error { return nil }
// SetVariable implements the MonitorBackend interface.
func (b *nullBackend) SetVariable(id string, v int64) {}
// IncrVariable implements the MonitorBackend interface.
func (b *nullBackend) IncrVariable(id string) {}
// DecrVariable implements the MonitorBackend interface.
func (b *nullBackend) DecrVariable(id string) {}
// ReadVariable implements the MonitorBackend interface.
func (b *nullBackend) ReadVariable(id string) (StaySetVariable, error) {
return &nullStaySetVariable{}, nil
}
// StaySetVariablesDo implements the MonitorBackend interface.
func (b *nullBackend) StaySetVariablesDo(f func(StaySetVariable)) error { return nil }
// Register implements the MonitorBackend interface.
func (b *nullBackend) Register(id string, rf DynamicStatusRetriever) {}
// ReadStatus implements the MonitorBackend interface.
func (b *nullBackend) ReadStatus(id string) (string, error) { return "", nil }
// DynamicStatusValuesDo implements the MonitorBackend interface.
func (b *nullBackend) DynamicStatusValuesDo(f func(DynamicStatusValue)) error { return nil }
// SetMeasuringsFilter implements the MonitorBackend interface.
func (b *nullBackend) SetMeasuringsFilter(f IDFilter) IDFilter { return nil }
// SetVariablesFilter implements the MonitorBackend interface.
func (b *nullBackend) SetVariablesFilter(f IDFilter) IDFilter { return nil }
// SetRetrieversFilter implements the MonitorBackend interface.
func (b *nullBackend) SetRetrieversFilter(f IDFilter) IDFilter { return nil }
// Reset implements the MonitorBackend interface.
func (b *nullBackend) Reset() error { return nil }
// Stop implements the MonitorBackend interface.
func (b *nullBackend) Stop() {}
// EOF
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