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| 83 | Package org.apache.hadoop.io.retry |
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| 84 | </H2> |
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| 85 | |
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| 86 | A mechanism for selectively retrying methods that throw exceptions under certain circumstances. |
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| 87 | <P> |
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| 88 | <B>See:</B> |
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| 99 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/io/retry/RetryPolicy.html" title="interface in org.apache.hadoop.io.retry">RetryPolicy</A></B></TD> |
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| 100 | <TD> |
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| 101 | Specifies a policy for retrying method failures.</TD> |
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| 114 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/io/retry/RetryPolicies.html" title="class in org.apache.hadoop.io.retry">RetryPolicies</A></B></TD> |
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| 115 | <TD> |
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| 116 | A collection of useful implementations of <A HREF="../../../../../org/apache/hadoop/io/retry/RetryPolicy.html" title="interface in org.apache.hadoop.io.retry"><CODE>RetryPolicy</CODE></A>.</TD> |
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| 121 | A factory for creating retry proxies.</TD> |
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| 128 | Package org.apache.hadoop.io.retry Description |
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| 129 | </H2> |
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| 130 | |
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| 131 | <P> |
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| 132 | <p> |
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| 133 | A mechanism for selectively retrying methods that throw exceptions under certain circumstances. |
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| 134 | </p> |
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| 135 | |
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| 136 | <p> |
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| 137 | Typical usage is |
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| 138 | </p> |
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| 139 | |
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| 140 | <pre> |
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| 141 | UnreliableImplementation unreliableImpl = new UnreliableImplementation(); |
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| 142 | UnreliableInterface unreliable = (UnreliableInterface) |
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| 143 | RetryProxy.create(UnreliableInterface.class, unreliableImpl, |
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| 144 | RetryPolicies.retryUpToMaximumCountWithFixedSleep(4, 10, TimeUnit.SECONDS)); |
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| 145 | unreliable.call(); |
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| 146 | </pre> |
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| 147 | |
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| 148 | <p> |
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| 149 | This will retry any method called on <code>unreliable</code> four times - in this case the <code>call()</code> |
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| 150 | method - sleeping 10 seconds between |
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| 151 | each retry. There are a number of <A HREF="../../../../../org/apache/hadoop/io/retry/RetryPolicies.html" title="class in org.apache.hadoop.io.retry"><CODE>retry policies</CODE></A> |
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| 152 | available, or you can implement a custom one by implementing <A HREF="../../../../../org/apache/hadoop/io/retry/RetryPolicy.html" title="interface in org.apache.hadoop.io.retry"><CODE>RetryPolicy</CODE></A>. |
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| 153 | It is also possible to specify retry policies on a |
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| 154 | <A HREF="../../../../../org/apache/hadoop/io/retry/RetryProxy.html#create(java.lang.Class, java.lang.Object, java.util.Map)"><CODE>per-method basis</CODE></A>. |
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