ReadyMonitor (Apache Accumulo Server Base 2.1.0 API)

java.lang.Object
- org.apache.accumulo.server.conf.store.impl.ReadyMonitor

```
public class ReadyMonitor
extends Object
```
Provides a barrier to block operations until a resource signals that it is ready. This class encapsulates a wait / notify operation using a lock and condition. Instances are initialized with the resource unavailable - call setReady() when the resource is available

Constructor Summary

Constructors
Constructor Description

ReadyMonitor(String resourceName, long timeout)
Create an instance of a ready monitor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`clearReady()`	Indicate that resource is NOT available and that calls to `isReady()` should block.
`void`	`isReady()`	Method blocks until the resource is ready.
`void`	`setClosed()`	ZooKeeper has closed the connection.
`void`	`setReady()`	Indicate that the resource is ready.
`boolean`	`test()`	Non-blocking call to get ready state.
`String`	`toString()`

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

- Constructor Detail
  - ReadyMonitor
```
public ReadyMonitor(String resourceName,
                    long timeout)
```
    Create an instance of a ready monitor.
    
    Parameters:
    
    resourceName - the resource name guarded by this monitor (used by logging)
    
    timeout - the max time in milliseconds this will block waiting.
- Method Detail
  - test
```
public boolean test()
```
    Non-blocking call to get ready state. It will throw is the ZooKeeper connection has closed (non-recoverable condition)
    
    Returns:
    
    true if resource is ready, false otherwise
  - isReady
```
public void isReady()
```
    Method blocks until the resource is ready. If the resource does not become ready within the timeout an IllegalStateException is thrown.
    
    Throws:
    
    IllegalStateException - if the resource does not signal ready withing timeout.
  - setClosed
```
public void setClosed()
```
    ZooKeeper has closed the connection. This is a terminal state that cannot be recoved from without creating a new ZooKeeper client.
  - setReady
```
public void setReady()
```
    Indicate that the resource is ready.
  - clearReady
```
public void clearReady()
```
    Indicate that resource is NOT available and that calls to isReady() should block.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object