org.apache.hadoop.hbase.master.handler
Class TableEventHandler

java.lang.Object
  org.apache.hadoop.hbase.executor.EventHandler
      org.apache.hadoop.hbase.master.handler.TableEventHandler

All Implemented Interfaces:

Comparable<Runnable>, Runnable

Direct Known Subclasses:

DeleteTableHandler, ModifyTableHandler, RestoreSnapshotHandler, TableAddFamilyHandler, TableDeleteFamilyHandler, TableModifyFamilyHandler

@InterfaceAudience.Private
public abstract class TableEventHandler
extends EventHandler

Base class for performing operations against tables. Checks on whether the process can go forward are done in constructor rather than later on in process(). The idea is to fail fast rather than later down in an async invocation of process() (which currently has no means of reporting back issues once started).

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.executor.EventHandler

EventHandler.EventHandlerListener

Field Summary

protected MasterServices	masterServices
protected TableLockManager.TableLock	tableLock
protected TableName	tableName

Fields inherited from class org.apache.hadoop.hbase.executor.EventHandler

eventType, seqids, server, waitingTimeForEvents

Constructor Summary

TableEventHandler(EventType eventType, TableName tableName, Server server, MasterServices masterServices)

Method Summary

protected void	completed(Throwable exception) Called after that process() is completed.
HTableDescriptor	getTableDescriptor() Gets a TableDescriptor from the masterServices.
protected abstract void	handleTableOperation(List<HRegionInfo> regions)
TableEventHandler	prepare() Event handlers should do all the necessary checks in this method (rather than in the constructor, or in process()) so that the caller, which is mostly executed in the ipc context can fail fast.
protected void	prepareWithTableLock() Called from prepare() while holding the table lock.
void	process() This method is the main processing loop to be implemented by the various subclasses.
protected void	releaseTableLock()
boolean	reOpenAllRegions(List<HRegionInfo> regions)

Methods inherited from class org.apache.hadoop.hbase.executor.EventHandler

compareTo, getEventType, getInformativeName, getListener, getPriority, getSeqid, handleException, run, setListener, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

masterServices

protected final MasterServices masterServices

tableName

protected final TableName tableName

tableLock

protected TableLockManager.TableLock tableLock

Constructor Detail

TableEventHandler

public TableEventHandler(EventType eventType,
                         TableName tableName,
                         Server server,
                         MasterServices masterServices)

Method Detail

prepare

public TableEventHandler prepare()
                          throws IOException

Description copied from class: EventHandler

Event handlers should do all the necessary checks in this method (rather than in the constructor, or in process()) so that the caller, which is mostly executed in the ipc context can fail fast. Process is executed async from the client ipc, so this method gives a quick chance to do some basic checks. Should be called after constructing the EventHandler, and before process().

Overrides:

prepare in class EventHandler

Returns:

the instance of this class

Throws:

IOException

prepareWithTableLock

protected void prepareWithTableLock()
                             throws IOException

Called from prepare() while holding the table lock. Subclasses can do extra initialization, and not worry about the releasing the table lock.

Throws:

IOException

process

public void process()

Description copied from class: EventHandler

This method is the main processing loop to be implemented by the various subclasses.

Specified by:

process in class EventHandler

releaseTableLock

protected void releaseTableLock()

completed

protected void completed(Throwable exception)

Called after that process() is completed.

Parameters:

exception - null if process() is successful or not null if something has failed.

reOpenAllRegions

public boolean reOpenAllRegions(List<HRegionInfo> regions)
                         throws IOException

Throws:

IOException

getTableDescriptor

public HTableDescriptor getTableDescriptor()
                                    throws FileNotFoundException,
                                           IOException

Gets a TableDescriptor from the masterServices. Can Throw exceptions.

Returns:

Table descriptor for this table

Throws:

TableExistsException

FileNotFoundException

IOException

handleTableOperation

protected abstract void handleTableOperation(List<HRegionInfo> regions)
                                      throws IOException,
                                             org.apache.zookeeper.KeeperException

Throws:

IOException

org.apache.zookeeper.KeeperException