org.apache.hadoop.hbase.client

Class DelegatingRetryingCallable<T,D extends RetryingCallable<T>>

java.lang.Object

org.apache.hadoop.hbase.client.DelegatingRetryingCallable<T,D>

Type Parameters:

T - Result class from calls to the delegate RetryingCallable

D - Type of the delegate class

All Implemented Interfaces:

RetryingCallable<T>

@InterfaceAudience.Private
public class DelegatingRetryingCallable<T,D extends RetryingCallable<T>>
extends Object
implements RetryingCallable<T>

Helper callable for internal use when you just want to override a single method of a RetryingCallable. By default, this just delegates all RetryingCallable methods to the specified delegate.

Field Summary

Fields

Modifier and Type	Field and Description
protected D	delegate

Constructor Summary

Constructors

Constructor and Description
DelegatingRetryingCallable(D delegate)

Method Summary

Methods

Modifier and Type	Method and Description
T	call(int callTimeout) Computes a result, or throws an exception if unable to do so.
String	getExceptionMessageAdditionalDetail()
void	prepare(boolean reload) Prepare by setting up any connections to servers, etc., ahead of RetryingCallable.call(int) invocation.
long	sleep(long pause, int tries)
void	throwable(Throwable t, boolean retrying) Called when RetryingCallable.call(int) throws an exception and we are going to retry; take action to make it so we succeed on next call (clear caches, do relookup of locations, etc.).

Methods inherited from class java.lang.Object

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

Field Detail

delegate

protected final D extends RetryingCallable<T> delegate

Constructor Detail

DelegatingRetryingCallable

public DelegatingRetryingCallable(D delegate)

Method Detail

call

public T call(int callTimeout)
       throws Exception

Description copied from interface: RetryingCallable

Computes a result, or throws an exception if unable to do so.

Specified by:

call in interface RetryingCallable<T>

Parameters:

callTimeout - - the time available for this call. 0 for infinite.

Returns:

computed result

Throws:

Exception - if unable to compute a result

prepare

public void prepare(boolean reload)
             throws IOException

Description copied from interface: RetryingCallable

Prepare by setting up any connections to servers, etc., ahead of RetryingCallable.call(int) invocation.

Specified by:

prepare in interface RetryingCallable<T>

Parameters:

reload - Set this to true if need to requery locations

Throws:

IOException - e

throwable

public void throwable(Throwable t,
             boolean retrying)

Description copied from interface: RetryingCallable

Called when RetryingCallable.call(int) throws an exception and we are going to retry; take action to make it so we succeed on next call (clear caches, do relookup of locations, etc.).

Specified by:

throwable in interface RetryingCallable<T>

retrying - True if we are in retrying mode (we are not in retrying mode when max retries == 1; we ARE in retrying mode if retries > 1 even when we are the last attempt)

getExceptionMessageAdditionalDetail

public String getExceptionMessageAdditionalDetail()

Specified by:

getExceptionMessageAdditionalDetail in interface RetryingCallable<T>

Returns:

Some details from the implementation that we would like to add to a terminating exception; i.e. a fatal exception is being thrown ending retries and we might like to add more implementation-specific detail on to the exception being thrown.

sleep

public long sleep(long pause,
         int tries)

Specified by:

sleep in interface RetryingCallable<T>

Returns:

Suggestion on how much to sleep between retries