Package org.apache.curator.connection

Class ThreadLocalRetryLoop

java.lang.Object

org.apache.curator.connection.ThreadLocalRetryLoop

public class ThreadLocalRetryLoop
extends java.lang.Object

Retry loops can easily end up getting nested which can cause exponential calls of the retry policy (see https://issues.apache.org/jira/browse/CURATOR-559). This utility works around that by using an internal ThreadLocal to hold a retry loop. E.g. if the retry loop fails anywhere in the chain of nested calls it will fail for the rest of the nested calls instead.

Example usage:

 ThreadLocalRetryLoop threadLocalRetryLoop = new ThreadLocalRetryLoop();
 RetryLoop retryLoop = threadLocalRetryLoop.getRetryLoop(client::newRetryLoop);
 try
 {
     while ( retryLoop.shouldContinue() )
     {
         try
         {
             // do work
             retryLoop.markComplete();
         }
         catch ( Exception e )
         {
             ThreadUtils.checkInterrupted(e);
             retryLoop.takeException(e);
         }
     }
 }
 finally
 {
     threadLocalRetryLoop.release();
 }
 

Constructor Summary

Constructors

Constructor	Description
ThreadLocalRetryLoop()

Method Summary

Modifier and Type	Method	Description
RetryLoop	getRetryLoop(java.util.function.Supplier<RetryLoop> newRetryLoopSupplier)	Call to get the current retry loop.
void	release()	Must be called to release the retry loop.

Methods inherited from class java.lang.Object

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

Constructor Detail

ThreadLocalRetryLoop

public ThreadLocalRetryLoop()

Method Detail

getRetryLoop

public RetryLoop getRetryLoop(java.util.function.Supplier<RetryLoop> newRetryLoopSupplier)

Call to get the current retry loop. If there isn't one, one is allocated via newRetryLoopSupplier.

Parameters:

newRetryLoopSupplier - supply a new retry loop when needed. Normally you should use CuratorZookeeperClient.newRetryLoop()

Returns:

retry loop to use

release

public void release()

Must be called to release the retry loop. See StandardConnectionHandlingPolicy.callWithRetry(org.apache.curator.CuratorZookeeperClient, java.util.concurrent.Callable) for an example usage.