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| <h2 title="Class AllocationManager" class="title">Class AllocationManager</h2> |
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| <li>org.apache.arrow.memory.AllocationManager</li> |
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| <pre>public abstract class <span class="typeNameLabel">AllocationManager</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">An AllocationManager is the implementation of a physical memory allocation. |
| |
| <p>Manages the relationship between the allocators and a particular memory allocation. Ensures that |
| one allocator owns the memory that multiple allocators may be referencing. Manages a BufferLedger between |
| each of its associated allocators. It does not track the reference count; that is the role of <a href="../../../../org/apache/arrow/memory/BufferLedger.html" title="class in org.apache.arrow.memory"><code>BufferLedger</code></a> |
| (aka <a href="../../../../org/apache/arrow/memory/ReferenceManager.html" title="interface in org.apache.arrow.memory"><code>ReferenceManager</code></a>). |
| |
| <p>This is a public interface implemented by concrete allocator implementations (e.g. Netty or Unsafe). |
| |
| <p>Threading: AllocationManager manages thread-safety internally. Operations within the context |
| of a single BufferLedger are lockless in nature and can be leveraged by multiple threads. Operations that cross the |
| context of two ledgers will acquire a lock on the AllocationManager instance. Important note, there is one |
| AllocationManager per physical buffer allocation. As such, there will be thousands of these in a |
| typical query. The contention of acquiring a lock on AllocationManager should be very low.</div> |
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| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationManager.Factory.html" title="interface in org.apache.arrow.memory">AllocationManager.Factory</a></span></code> |
| <div class="block">A factory interface for creating <a href="../../../../org/apache/arrow/memory/AllocationManager.html" title="class in org.apache.arrow.memory"><code>AllocationManager</code></a>.</div> |
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| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationManager.html#AllocationManager-org.apache.arrow.memory.BufferAllocator-">AllocationManager</a></span>(<a href="../../../../org/apache/arrow/memory/BufferAllocator.html" title="interface in org.apache.arrow.memory">BufferAllocator</a> accountingAllocator)</code> </td> |
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| <td class="colFirst"><code>abstract long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationManager.html#getSize--">getSize</a></span>()</code> |
| <div class="block">Return the size of underlying chunk of memory managed by this Allocation Manager.</div> |
| </td> |
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| <td class="colFirst"><code>protected abstract long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationManager.html#memoryAddress--">memoryAddress</a></span>()</code> |
| <div class="block">Return the absolute memory address pointing to the fist byte of underlying memory chunk.</div> |
| </td> |
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| <td class="colFirst"><code>protected abstract void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/memory/AllocationManager.html#release0--">release0</a></span>()</code> |
| <div class="block">Release the underlying memory chunk.</div> |
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| <h4>AllocationManager</h4> |
| <pre>protected AllocationManager(<a href="../../../../org/apache/arrow/memory/BufferAllocator.html" title="interface in org.apache.arrow.memory">BufferAllocator</a> accountingAllocator)</pre> |
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| <pre>public abstract long getSize()</pre> |
| <div class="block">Return the size of underlying chunk of memory managed by this Allocation Manager. |
| |
| <p>The underlying memory chunk managed can be different from the original requested size.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>size of underlying memory chunk</dd> |
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| <pre>protected abstract long memoryAddress()</pre> |
| <div class="block">Return the absolute memory address pointing to the fist byte of underlying memory chunk.</div> |
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