FailureDetector

All Known Implementing Classes:

DeadlineFailureDetector, PhiAccrualFailureDetector
```
public interface FailureDetector
```
A failure detector must be a thread-safe mutable construct that registers heartbeat events of a resource and is able to decide the availability of that monitored resource.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class FailureDetector.Clock
Abstraction of a clock that returns time in milliseconds.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`heartbeat()`	Notifies the FailureDetector that a heartbeat arrived from the monitored resource.
`boolean`	`isAvailable()`	Returns true if the resource is considered to be up and healthy and returns false otherwise.
`boolean`	`isMonitoring()`	Returns true if the failure detector has received any heartbeats and started monitoring of the resource.

- Method Detail
  - isAvailable
```
boolean isAvailable()
```
    Returns true if the resource is considered to be up and healthy and returns false otherwise.
  - isMonitoring
```
boolean isMonitoring()
```
    Returns true if the failure detector has received any heartbeats and started monitoring of the resource.
  - heartbeat
```
void heartbeat()
```
    Notifies the FailureDetector that a heartbeat arrived from the monitored resource. This causes the FailureDetector to update its state.