Module io.helidon.faulttolerance

Package io.helidon.faulttolerance

Class Retry.DelayingRetryPolicy

java.lang.Object

io.helidon.faulttolerance.Retry.DelayingRetryPolicy

All Implemented Interfaces:

Retry.RetryPolicy

Enclosing interface:

Retry

public static class Retry.DelayingRetryPolicy
extends Object
implements Retry.RetryPolicy

A retry policy that prolongs the delays between retries by a defined factor.

Consider the following setup:

• calls = 4
• delayMillis = 100
• factor = 2.0

The following delays will be used for each call:

• Initial call - always immediate (not handled by retry policy)
• First retry - 100 millis
• Second retry - 200 millis (previous delay * factor)
• Third retry - 400 millis (previous delay * factor)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Retry.DelayingRetryPolicy.Builder	Fluent API builder for Retry.DelayingRetryPolicy.

Method Summary

Modifier and Type	Method	Description
static Retry.DelayingRetryPolicy.Builder	builder()	A builder to customize configuration of Retry.DelayingRetryPolicy.
Optional<Long>	nextDelayMillis(long firstCallMillis, long lastDelay, int call)	Return next delay in milliseconds, or an empty optional to finish retries.
static Retry.DelayingRetryPolicy	noDelay(int calls)	Create a retry policy with no delays and with the specified number of calls.

Methods inherited from class java.lang.Object

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

Method Details

builder

public static Retry.DelayingRetryPolicy.Builder builder()

A builder to customize configuration of Retry.DelayingRetryPolicy.

Returns:

a new builder

noDelay

public static Retry.DelayingRetryPolicy noDelay(int calls)

Create a retry policy with no delays and with the specified number of calls.

Parameters:

calls - number of calls to execute (retries + initial call)

Returns:

a no delay retry policy

nextDelayMillis

public Optional<Long> nextDelayMillis(long firstCallMillis,
 long lastDelay,
 int call)

Description copied from interface: Retry.RetryPolicy

Return next delay in milliseconds, or an empty optional to finish retries.

Specified by:

nextDelayMillis in interface Retry.RetryPolicy

Parameters:

firstCallMillis - milliseconds recorded before the first call using System.currentTimeMillis()

lastDelay - last delay that was used (0 for the first failed call)

call - call index (0 for the first failed call)

Returns:

how long to wait before trying again, or empty to notify this is the end of retries