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| <h2 title="Interface LogSegmentEntryReader" class="title">Interface LogSegmentEntryReader</h2> |
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| <pre>@Beta |
| public interface <span class="typeNameLabel">LogSegmentEntryReader</span> |
| extends <a href="../../../../org/apache/distributedlog/io/AsyncCloseable.html" title="interface in org.apache.distributedlog.io">AsyncCloseable</a></pre> |
| <div class="block">An interface class to read the enveloped entry (serialized bytes of |
| <a href="../../../../org/apache/distributedlog/Entry.html" title="class in org.apache.distributedlog"><code>Entry</code></a>) from a log segment</div> |
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| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.StateChangeListener.html" title="interface in org.apache.distributedlog.logsegment">LogSegmentEntryReader.StateChangeListener</a></span></code> </td> |
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| <code><a href="../../../../org/apache/distributedlog/io/AsyncCloseable.html#CLOSE_FUNC">CLOSE_FUNC</a>, <a href="../../../../org/apache/distributedlog/io/AsyncCloseable.html#CLOSE_FUNC_IGNORE_ERRORS">CLOSE_FUNC_IGNORE_ERRORS</a>, <a href="../../../../org/apache/distributedlog/io/AsyncCloseable.html#NULL">NULL</a></code></li> |
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| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html#getLastAddConfirmed--">getLastAddConfirmed</a></span>()</code> |
| <div class="block">Return the last add confirmed entry id (LAC).</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/distributedlog/LogSegmentMetadata.html" title="class in org.apache.distributedlog">LogSegmentMetadata</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html#getSegment--">getSegment</a></span>()</code> |
| <div class="block">Return the log segment metadata for this reader.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html#hasCaughtUpOnInprogress--">hasCaughtUpOnInprogress</a></span>()</code> |
| <div class="block">Has the log segment reader caught up with the inprogress log segment.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html#isBeyondLastAddConfirmed--">isBeyondLastAddConfirmed</a></span>()</code> |
| <div class="block">Is the reader reading beyond last add confirmed.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html#onLogSegmentMetadataUpdated-org.apache.distributedlog.LogSegmentMetadata-">onLogSegmentMetadataUpdated</a></span>(<a href="../../../../org/apache/distributedlog/LogSegmentMetadata.html" title="class in org.apache.distributedlog">LogSegmentMetadata</a> segment)</code> |
| <div class="block">Update the log segment each time when the metadata has changed.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="http://download.oracle.com/javase/6/docs/api/java/util/concurrent/CompletableFuture.html?is-external=true" title="class or interface in java.util.concurrent">CompletableFuture</a><<a href="http://download.oracle.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/distributedlog/Entry.Reader.html" title="interface in org.apache.distributedlog">Entry.Reader</a>>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html#readNext-int-">readNext</a></span>(int numEntries)</code> |
| <div class="block">Read next <i>numEntries</i> entries from current log segment.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html" title="interface in org.apache.distributedlog.logsegment">LogSegmentEntryReader</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html#registerListener-org.apache.distributedlog.logsegment.LogSegmentEntryReader.StateChangeListener-">registerListener</a></span>(<a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.StateChangeListener.html" title="interface in org.apache.distributedlog.logsegment">LogSegmentEntryReader.StateChangeListener</a> listener)</code> |
| <div class="block">Register the state change listener</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html#start--">start</a></span>()</code> |
| <div class="block">Start the reader.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html" title="interface in org.apache.distributedlog.logsegment">LogSegmentEntryReader</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html#unregisterListener-org.apache.distributedlog.logsegment.LogSegmentEntryReader.StateChangeListener-">unregisterListener</a></span>(<a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.StateChangeListener.html" title="interface in org.apache.distributedlog.logsegment">LogSegmentEntryReader.StateChangeListener</a> listener)</code> |
| <div class="block">Unregister the state change listener</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
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| <!-- --> |
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| <h3>Methods inherited from interface org.apache.distributedlog.io.<a href="../../../../org/apache/distributedlog/io/AsyncCloseable.html" title="interface in org.apache.distributedlog.io">AsyncCloseable</a></h3> |
| <code><a href="../../../../org/apache/distributedlog/io/AsyncCloseable.html#asyncClose--">asyncClose</a></code></li> |
| </ul> |
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| <h4>start</h4> |
| <pre>void start()</pre> |
| <div class="block">Start the reader. The method to signal the implementation |
| to start preparing the data for consumption <a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html#readNext-int-"><code>readNext(int)</code></a></div> |
| </li> |
| </ul> |
| <a name="registerListener-org.apache.distributedlog.logsegment.LogSegmentEntryReader.StateChangeListener-"> |
| <!-- --> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>registerListener</h4> |
| <pre><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html" title="interface in org.apache.distributedlog.logsegment">LogSegmentEntryReader</a> registerListener(<a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.StateChangeListener.html" title="interface in org.apache.distributedlog.logsegment">LogSegmentEntryReader.StateChangeListener</a> listener)</pre> |
| <div class="block">Register the state change listener</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>listener</code> - register the state change listener</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>entry reader</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="unregisterListener-org.apache.distributedlog.logsegment.LogSegmentEntryReader.StateChangeListener-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>unregisterListener</h4> |
| <pre><a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.html" title="interface in org.apache.distributedlog.logsegment">LogSegmentEntryReader</a> unregisterListener(<a href="../../../../org/apache/distributedlog/logsegment/LogSegmentEntryReader.StateChangeListener.html" title="interface in org.apache.distributedlog.logsegment">LogSegmentEntryReader.StateChangeListener</a> listener)</pre> |
| <div class="block">Unregister the state change listener</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>listener</code> - register the state change listener</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>entry reader</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getSegment--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getSegment</h4> |
| <pre><a href="../../../../org/apache/distributedlog/LogSegmentMetadata.html" title="class in org.apache.distributedlog">LogSegmentMetadata</a> getSegment()</pre> |
| <div class="block">Return the log segment metadata for this reader.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the log segment metadata</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="onLogSegmentMetadataUpdated-org.apache.distributedlog.LogSegmentMetadata-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>onLogSegmentMetadataUpdated</h4> |
| <pre>void onLogSegmentMetadataUpdated(<a href="../../../../org/apache/distributedlog/LogSegmentMetadata.html" title="class in org.apache.distributedlog">LogSegmentMetadata</a> segment)</pre> |
| <div class="block">Update the log segment each time when the metadata has changed.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>segment</code> - new metadata of the log segment.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="readNext-int-"> |
| <!-- --> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>readNext</h4> |
| <pre><a href="http://download.oracle.com/javase/6/docs/api/java/util/concurrent/CompletableFuture.html?is-external=true" title="class or interface in java.util.concurrent">CompletableFuture</a><<a href="http://download.oracle.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../org/apache/distributedlog/Entry.Reader.html" title="interface in org.apache.distributedlog">Entry.Reader</a>>> readNext(int numEntries)</pre> |
| <div class="block">Read next <i>numEntries</i> entries from current log segment. |
| <p> |
| <i>numEntries</i> will be best-effort.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>numEntries</code> - num entries to read from current log segment</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A promise that when satisified will contain a non-empty list of entries with their content.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>{@link</code> - org.apache.distributedlog.exceptions.EndOfLogSegmentException} when |
| read entries beyond the end of a <i>closed</i> log segment.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getLastAddConfirmed--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getLastAddConfirmed</h4> |
| <pre>long getLastAddConfirmed()</pre> |
| <div class="block">Return the last add confirmed entry id (LAC).</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the last add confirmed entry id.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isBeyondLastAddConfirmed--"> |
| <!-- --> |
| </a> |
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| <li class="blockList"> |
| <h4>isBeyondLastAddConfirmed</h4> |
| <pre>boolean isBeyondLastAddConfirmed()</pre> |
| <div class="block">Is the reader reading beyond last add confirmed.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the reader is reading beyond last add confirmed</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="hasCaughtUpOnInprogress--"> |
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| <li class="blockList"> |
| <h4>hasCaughtUpOnInprogress</h4> |
| <pre>boolean hasCaughtUpOnInprogress()</pre> |
| <div class="block">Has the log segment reader caught up with the inprogress log segment.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true only if the log segment is inprogress and it is caught up, otherwise return false.</dd> |
| </dl> |
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