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| <h2 title="Interface FallbackHandler" class="title">Interface FallbackHandler<T></h2> |
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| <dt>All Known Implementing Classes:</dt> |
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| <pre>public interface <span class="typeNameLabel">FallbackHandler<T></span></pre> |
| <div class="block">The handler instance used by the container to service a fallback invocation is a non-contextual |
| instance created using the CDI SPI. The instance exists to service a single invocation only. |
| The type parameter of the handler instance must be assignable to the return type of the method, |
| where the <a href="../../../../org/eclipse/microprofile/faulttolerance/Fallback.html" title="annotation in org.eclipse.microprofile.faulttolerance"><code>Fallback</code></a> is specified. The container must ensure this type safety. |
| Otherwise, <code>IllegalArgumentException</code> should be thrown. |
| <h3>Usage</h3> |
| <pre> |
| public class MyService { |
| @Inject OtherService otherService; |
| |
| @Timeout(3000) |
| @Fallback(MyFallback.class) |
| Long getAmount() { |
| return otherService.getAmount() * 2; |
| } |
| } |
| </pre> |
| |
| The fallback handler implementation is shown below. The type parameter must be assignable to |
| <code>Long</code>. |
| |
| <pre> |
| public class MyFallback implements FallbackHandler<Long> { |
| Long handle(ExecutionContext context) { |
| return 42; |
| } |
| } |
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| <td class="colFirst"><code><a href="../../../../org/eclipse/microprofile/faulttolerance/FallbackHandler.html" title="type parameter in FallbackHandler">T</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/microprofile/faulttolerance/FallbackHandler.html#handle-org.eclipse.microprofile.faulttolerance.ExecutionContext-">handle</a></span>(<a href="../../../../org/eclipse/microprofile/faulttolerance/ExecutionContext.html" title="interface in org.eclipse.microprofile.faulttolerance">ExecutionContext</a> context)</code> |
| <div class="block">Handle the previous calling failure and then call alternative methods |
| or perform any alternative operations.</div> |
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| <h4>handle</h4> |
| <pre><a href="../../../../org/eclipse/microprofile/faulttolerance/FallbackHandler.html" title="type parameter in FallbackHandler">T</a> handle(<a href="../../../../org/eclipse/microprofile/faulttolerance/ExecutionContext.html" title="interface in org.eclipse.microprofile.faulttolerance">ExecutionContext</a> context)</pre> |
| <div class="block">Handle the previous calling failure and then call alternative methods |
| or perform any alternative operations.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>context</code> - the execution context</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the result of the fallback</dd> |
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