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| <div class="subTitle">org.apache.drill.exec.physical.impl.scan.v3</div> |
| <h2 title="Interface ReaderFactory" class="title">Interface ReaderFactory<T extends <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/SchemaNegotiator.html" title="interface in org.apache.drill.exec.physical.impl.scan.v3">SchemaNegotiator</a>></h2> |
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| <dd><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/file/FileReaderFactory.html" title="class in org.apache.drill.exec.physical.impl.scan.v3.file">FileReaderFactory</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ScanLifecycleBuilder.DummyReaderFactory.html" title="class in org.apache.drill.exec.physical.impl.scan.v3">ScanLifecycleBuilder.DummyReaderFactory</a></dd> |
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| <pre>public interface <span class="typeNameLabel">ReaderFactory<T extends <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/SchemaNegotiator.html" title="interface in org.apache.drill.exec.physical.impl.scan.v3">SchemaNegotiator</a>></span></pre> |
| <div class="block">Creates a batch reader on demand. Unlike earlier versions of Drill, |
| this framework creates readers one by one, when they are needed. |
| Doing so avoids excessive resource demands that come from creating |
| potentially thousands of readers up front. |
| <p> |
| The reader itself is unique to each file type. This interface |
| provides a common interface that this framework can use to create the |
| file-specific reader on demand. |
| <p> |
| Also manages opening the reader using a scan-specific schema |
| negotiator.</div> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ReaderFactory.html#hasNext--">hasNext</a></span>()</code> </td> |
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| <td class="colFirst"><code><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ManagedReader.html" title="interface in org.apache.drill.exec.physical.impl.scan.v3">ManagedReader</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ReaderFactory.html#next-T-">next</a></span>(<a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ReaderFactory.html" title="type parameter in ReaderFactory">T</a> negotiator)</code> </td> |
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| <pre>boolean hasNext()</pre> |
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| <pre><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ManagedReader.html" title="interface in org.apache.drill.exec.physical.impl.scan.v3">ManagedReader</a> next(<a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ReaderFactory.html" title="type parameter in ReaderFactory">T</a> negotiator) |
| throws <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ManagedReader.EarlyEofException.html" title="class in org.apache.drill.exec.physical.impl.scan.v3">ManagedReader.EarlyEofException</a></pre> |
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| <dd><code><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ManagedReader.EarlyEofException.html" title="class in org.apache.drill.exec.physical.impl.scan.v3">ManagedReader.EarlyEofException</a></code></dd> |
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