RetryHelper (Ambari Server 3.0.0.0-SNAPSHOT API)

```
public class RetryHelper
extends Object
```
Provides utility methods to support operations retry TODO injection as Guice singleon, static for now to avoid major modifications

Constructors
Constructor and Description
`RetryHelper()`

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static void`	`addAffectedCluster(Cluster cluster)`
`static void`	`clearAffectedClusters()`
`static <T> T`	`executeWithRetry(Callable<T> command)`
`static Set<Cluster>`	`getAffectedClusters()`
`static int`	`getOperationsRetryAttempts()`
`static void`	`init(Clusters clusters, int operationsRetryAttempts)`
`static void`	`invalidateAffectedClusters()`
`static boolean`	`isDatabaseException(Throwable ex)`

public static void init(Clusters clusters,
                        int operationsRetryAttempts)

public static void addAffectedCluster(Cluster cluster)

public static Set<Cluster> getAffectedClusters()

public static void clearAffectedClusters()

public static int getOperationsRetryAttempts()

public static boolean isDatabaseException(Throwable ex)

public static void invalidateAffectedClusters()

public static <T> T executeWithRetry(Callable<T> command)
                              throws org.apache.ambari.server.AmbariException

Class RetryHelper