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| <h2 title="Interface AllocationReservation" class="title">Interface AllocationReservation</h2> |
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| <pre>public interface <span class="typeNameLabel">AllocationReservation</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></pre> |
| <div class="block">Supports cumulative allocation reservation. Clients may increase the size of the reservation |
| repeatedly until they |
| call for an allocation of the current total size. The reservation can only be used once, and |
| will throw an exception |
| if it is used more than once. |
| <p> |
| For the purposes of airtight memory accounting, the reservation must be close()d whether it is |
| used or not. |
| This is not threadsafe. |
| </p></div> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationReservation.html#add-int-">add</a></span>(int nBytes)</code> |
| <div class="block">Add to the current reservation.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationReservation.html#allocateBuffer--">allocateBuffer</a></span>()</code> |
| <div class="block">Allocate a buffer whose size is the total of all the add()s made.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationReservation.html#close--">close</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationReservation.html#getSize--">getSize</a></span>()</code> |
| <div class="block">Get the current size of the reservation (the sum of all the add()s).</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationReservation.html#isClosed--">isClosed</a></span>()</code> |
| <div class="block">Return whether or not the reservation has been closed.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationReservation.html#isUsed--">isUsed</a></span>()</code> |
| <div class="block">Return whether or not the reservation has been used.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationReservation.html#reserve-int-">reserve</a></span>(int nBytes)</code> |
| <div class="block">Requests a reservation of additional space.</div> |
| </td> |
| </tr> |
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| <h4>add</h4> |
| <pre>boolean add(int nBytes)</pre> |
| <div class="block">Add to the current reservation. |
| |
| <p>Adding may fail if the allocator is not allowed to consume any more space.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>nBytes</code> - the number of bytes to add</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the addition is possible, false otherwise</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if called after buffer() is used to allocate the reservation</dd> |
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| <h4>reserve</h4> |
| <pre>boolean reserve(int nBytes)</pre> |
| <div class="block">Requests a reservation of additional space. |
| |
| <p>The implementation of the allocator's inner class provides this.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>nBytes</code> - the amount to reserve</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the reservation can be satisfied, false otherwise</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="allocateBuffer--"> |
| <!-- --> |
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| <h4>allocateBuffer</h4> |
| <pre><a href="../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> allocateBuffer()</pre> |
| <div class="block">Allocate a buffer whose size is the total of all the add()s made. |
| |
| <p>The allocation request can still fail, even if the amount of space |
| requested is available, if the allocation cannot be made contiguously.</p></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the buffer, or null, if the request cannot be satisfied</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if called more than once</dd> |
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| <h4>getSize</h4> |
| <pre>int getSize()</pre> |
| <div class="block">Get the current size of the reservation (the sum of all the add()s).</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>size of the current reservation</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
| </a> |
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| <h4>isUsed</h4> |
| <pre>boolean isUsed()</pre> |
| <div class="block">Return whether or not the reservation has been used.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>whether or not the reservation has been used</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>isClosed</h4> |
| <pre>boolean isClosed()</pre> |
| <div class="block">Return whether or not the reservation has been closed.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>whether or not the reservation has been closed</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="close--"> |
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| <h4>close</h4> |
| <pre>void close()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code> in interface <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd> |
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