HdfsActiveSyncProvider (Alluxio Under File System - HDFS 294 API)

All Known Implementing Classes:

NoopHdfsActiveSyncProvider, SupportedHdfsActiveSyncProvider
```
public interface HdfsActiveSyncProvider
```
Interface for providing HDFS ActiveSync.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`alluxio.SyncInfo`	`getActivitySyncInfo()`	Get Active SyncInfo from the sync provider.
`boolean`	`startPolling(long txId)`	start polling thread.
`void`	`startSync(alluxio.AlluxioURI ufsUri)`	start syncing on a ufs uri.
`boolean`	`stopPolling()`	stop polling thread.
`void`	`stopSync(alluxio.AlluxioURI ufsUri)`	stop syncing on a ufs uri.

- Method Detail
  - getActivitySyncInfo
```
alluxio.SyncInfo getActivitySyncInfo()
```
    Get Active SyncInfo from the sync provider.
    
    Returns:
    
    SyncInfo a syncInfo containing information about what to sync and how to sync
  - startPolling
```
boolean startPolling(long txId)
              throws java.io.IOException
```
    start polling thread.
    
    Parameters:
    
    txId - transaction id to start monitoring
    
    Returns:
    
    true if polling thread started successfully
    
    Throws:
    
    java.io.IOException
  - stopPolling
```
boolean stopPolling()
```
    stop polling thread.
    
    Returns:
    
    true if polling thread stopped successfully
  - startSync
```
void startSync(alluxio.AlluxioURI ufsUri)
```
    start syncing on a ufs uri.
    
    Parameters:
    
    ufsUri - the ufs uri to monitor
  - stopSync
```
void stopSync(alluxio.AlluxioURI ufsUri)
```
    stop syncing on a ufs uri.
    
    Parameters:
    
    ufsUri - the ufs uri to stop monitoring