ServiceManager.Listener (Guava: Google Core Libraries for Java 30.1.1-jre API)乐学网一站式学习平台

java.lang.Object
- com.google.common.util.concurrent.ServiceManager.Listener

Enclosing class:

ServiceManager
```
public abstract static class ServiceManager.Listener
extends Object
```
A listener for the aggregate state changes of the services that are under management. Users that need to listen to more fine-grained events (such as when each particular service starts, or terminates), should attach service listeners to each individual service.

Since:

15.0 (present as an interface in 14.0)

Author:

Luke Sandberg

Constructor Summary

Constructors
Constructor Description

Listener()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`failure(Service service)`	Called when a component service has failed.
`void`	`healthy()`	Called when the service initially becomes healthy.
`void`	`stopped()`	Called when the all of the component services have reached a terminal state, either terminated or failed.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Listener
```
public Listener()
```
- Method Detail
  - healthy
```
public void healthy()
```
    Called when the service initially becomes healthy.
    This will be called at most once after all the services have entered the running state. If any services fail during start up or fail/terminate before all other services have started running then this method will not be called.
  - stopped
```
public void stopped()
```
    Called when the all of the component services have reached a terminal state, either terminated or failed.
  - failure
```
public void failure(Service service)
```
    Called when a component service has failed.
    
    Parameters:
    
    service - The service that failed.