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<h2 title="Class RepositoryException" class="title">Class RepositoryException</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>java.lang.Throwable</li>
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<dt>All Implemented Interfaces:</dt>
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<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a>, <a href="../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a>, <a href="../../../com/amazon/carbonado/SupportException.html" title="class in com.amazon.carbonado">SupportException</a></dd>
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<br>
<pre>public class <span class="strong">RepositoryException</span>
extends java.lang.Exception</pre>
<div class="block">General checked exception thrown when accessing a <a href="../../../com/amazon/carbonado/Repository.html" title="interface in com.amazon.carbonado"><code>Repository</code></a>.
<p>Some repository exceptions are the result of an optimistic lock failure
or deadlock. One resolution strategy is to exit all transactions and try the
operation again, after waiting some bounded random amount of time. As a
convenience, this class provides a mechanism to support such a backoff
strategy. For example:
<pre>
// Retry at most three more times
for (int retryCount = 3;;) {
try {
...
myObject.load();
...
myObject.update();
break;
} catch (OptimisticLockException e) {
// Wait up to one second before retrying
retryCount = e.backoff(e, retryCount, 1000);
}
}
</pre>
If the retry count is zero (or less) when backoff is called, then the
original exception is rethrown, indicating retry failure.</div>
<dl><dt><span class="strong">Author:</span></dt>
<dd>Brian S O'Neill</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../serialized-form.html#com.amazon.carbonado.RepositoryException">Serialized Form</a></dd></dl>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#RepositoryException()">RepositoryException</a></strong>()</code> </td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#RepositoryException(java.lang.String)">RepositoryException</a></strong>(java.lang.String message)</code> </td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#RepositoryException(java.lang.String, java.lang.Throwable)">RepositoryException</a></strong>(java.lang.String message,
java.lang.Throwable cause)</code> </td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#RepositoryException(java.lang.Throwable)">RepositoryException</a></strong>(java.lang.Throwable cause)</code> </td>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>static <E extends java.lang.Throwable> <br>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#backoff(E, int, int)">backoff</a></strong>(E e,
int retryCount,
int milliseconds)</code>
<div class="block">One strategy for resolving an optimistic lock failure is to try the
operation again, after waiting some bounded random amount of time.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.Throwable</code></td>
<td class="colLast"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#getRootCause()">getRootCause</a></strong>()</code>
<div class="block">Recursively calls getCause, until the root cause is found.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#makeFetchException(java.lang.String, java.lang.Throwable)">makeFetchException</a></strong>(java.lang.String message,
java.lang.Throwable cause)</code>
<div class="block">Subclasses can override this to provide a more specialized exception.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#makePersistException(java.lang.String, java.lang.Throwable)">makePersistException</a></strong>(java.lang.String message,
java.lang.Throwable cause)</code>
<div class="block">Subclasses can override this to provide a more specialized exception.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#toFetchException()">toFetchException</a></strong>()</code>
<div class="block">Converts RepositoryException into an appropriate FetchException.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#toFetchException(java.lang.String)">toFetchException</a></strong>(java.lang.String message)</code>
<div class="block">Converts RepositoryException into an appropriate FetchException, prepending
the specified message.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#toPersistException()">toPersistException</a></strong>()</code>
<div class="block">Converts RepositoryException into an appropriate PersistException.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a></code></td>
<td class="colLast"><code><strong><a href="../../../com/amazon/carbonado/RepositoryException.html#toPersistException(java.lang.String)">toPersistException</a></strong>(java.lang.String message)</code>
<div class="block">Converts RepositoryException into an appropriate PersistException, prepending
the specified message.</div>
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<h4>RepositoryException</h4>
<pre>public RepositoryException()</pre>
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<h4>RepositoryException</h4>
<pre>public RepositoryException(java.lang.String message)</pre>
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<h4>RepositoryException</h4>
<pre>public RepositoryException(java.lang.String message,
java.lang.Throwable cause)</pre>
</li>
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<h4>RepositoryException</h4>
<pre>public RepositoryException(java.lang.Throwable cause)</pre>
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<pre>public static <E extends java.lang.Throwable> int backoff(E e,
int retryCount,
int milliseconds)
throws E extends java.lang.Throwable</pre>
<div class="block">One strategy for resolving an optimistic lock failure is to try the
operation again, after waiting some bounded random amount of time. This
method is provided as a convenience, to support such a random wait.
<p>
A retry count is required as well, which is decremented and returned by
this method. If the retry count is zero (or less) when this method is
called, then this exception is thrown again, indicating retry failure.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>retryCount</code> - current retry count, if zero, throw this exception again</dd><dd><code>milliseconds</code> - upper bound on the random amount of time to wait</dd>
<dt><span class="strong">Returns:</span></dt><dd>retryCount minus one</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>E</code> - if retry count is zero</dd>
<dd><code>E extends java.lang.Throwable</code></dd></dl>
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<pre>public java.lang.Throwable getRootCause()</pre>
<div class="block">Recursively calls getCause, until the root cause is found. Returns this
if no root cause.</div>
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<pre>public final <a href="../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a> toPersistException()</pre>
<div class="block">Converts RepositoryException into an appropriate PersistException.</div>
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<pre>public final <a href="../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a> toPersistException(java.lang.String message)</pre>
<div class="block">Converts RepositoryException into an appropriate PersistException, prepending
the specified message. If message is null, original exception message is
preserved.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>message</code> - message to prepend, which may be null</dd></dl>
</li>
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<h4>toFetchException</h4>
<pre>public final <a href="../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a> toFetchException()</pre>
<div class="block">Converts RepositoryException into an appropriate FetchException.</div>
</li>
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<h4>toFetchException</h4>
<pre>public final <a href="../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a> toFetchException(java.lang.String message)</pre>
<div class="block">Converts RepositoryException into an appropriate FetchException, prepending
the specified message. If message is null, original exception message is
preserved.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>message</code> - message to prepend, which may be null</dd></dl>
</li>
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<pre>protected <a href="../../../com/amazon/carbonado/PersistException.html" title="class in com.amazon.carbonado">PersistException</a> makePersistException(java.lang.String message,
java.lang.Throwable cause)</pre>
<div class="block">Subclasses can override this to provide a more specialized exception.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>message</code> - exception message, which may be null</dd><dd><code>cause</code> - non-null cause</dd></dl>
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<pre>protected <a href="../../../com/amazon/carbonado/FetchException.html" title="class in com.amazon.carbonado">FetchException</a> makeFetchException(java.lang.String message,
java.lang.Throwable cause)</pre>
<div class="block">Subclasses can override this to provide a more specialized exception.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>message</code> - exception message, which may be null</dd><dd><code>cause</code> - non-null cause</dd></dl>
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