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<div class="subTitle">org.apache.http.client.cache</div>
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<h2 title="Interface HttpCacheUpdateCallback" class="title">Interface HttpCacheUpdateCallback</h2>
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<pre>public interface <span class="strong">HttpCacheUpdateCallback</span></pre>
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<div class="block">Used for atomically updating entries in a <a href="../../../../../org/apache/http/client/cache/HttpCacheStorage.html" title="interface in org.apache.http.client.cache"><code>HttpCacheStorage</code></a>
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<td class="colFirst"><code><a href="../../../../../org/apache/http/client/cache/HttpCacheEntry.html" title="class in org.apache.http.client.cache">HttpCacheEntry</a></code></td>
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<td class="colLast"><code><strong><a href="../../../../../org/apache/http/client/cache/HttpCacheUpdateCallback.html#update(org.apache.http.client.cache.HttpCacheEntry)">update</a></strong>(<a href="../../../../../org/apache/http/client/cache/HttpCacheEntry.html" title="class in org.apache.http.client.cache">HttpCacheEntry</a> existing)</code>
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<h4>update</h4>
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<pre><a href="../../../../../org/apache/http/client/cache/HttpCacheEntry.html" title="class in org.apache.http.client.cache">HttpCacheEntry</a> update(<a href="../../../../../org/apache/http/client/cache/HttpCacheEntry.html" title="class in org.apache.http.client.cache">HttpCacheEntry</a> existing)
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throws <a href="https://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
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<div class="block">Returns the new cache entry that should replace an existing one.</div>
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>existing</code> - the cache entry currently in-place in the cache, possibly
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<code>null</code> if nonexistent</dd>
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<dt><span class="strong">Returns:</span></dt><dd>the cache entry that should replace it, again,
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possibly <code>null</code> if the entry should be deleted</dd>
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<dt><span class="strong">Throws:</span></dt>
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<dd><code><a href="https://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd><dt><span class="strong">Since:</span></dt>
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<dd>4.1</dd></dl>
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