PersistentWindowingTopology (Storm 2.7.1 API)

java.lang.Object
- org.apache.storm.starter.PersistentWindowingTopology

```
public class PersistentWindowingTopology
extends Object
```
An example that demonstrates the usage of IStatefulWindowedBolt with window persistence.
The framework automatically checkpoints the tuples in the window along with the bolt's state and restores the same during restarts.

This topology uses 'redis' for state persistence, so you should also start a redis instance before deploying. If you are running in local mode you can just start a redis server locally which will be used for storing the state. The default RedisKeyValueStateProvider parameters can be overridden by setting Config.TOPOLOGY_STATE_PROVIDER_CONFIG, for e.g.
```
 {
   "jedisPoolConfig": {
     "host": "redis-server-host",
     "port": 6379,
     "timeout": 2000,
     "database": 0,
     "password": "xyz"
   }
 }
 
```

- Constructor Summary
  
  Constructors
  Constructor Description
  
  PersistentWindowingTopology()
- Method Summary
  
  All Methods Static Methods Concrete Methods
  Modifier and Type Method Description
  
  static void main(String[] args)
  Create and deploy the topology.
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - PersistentWindowingTopology
```
public PersistentWindowingTopology()
```
- Method Detail
  - main
```
public static void main(String[] args)
                 throws Exception
```
    Create and deploy the topology.
    
    Parameters:
    
    args - args
    
    Throws:
    
    Exception - exception