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| <div class="subTitle">org.apache.drill.exec.memory</div> |
| <h2 title="Class AllocationManager.BufferLedger" class="title">Class AllocationManager.BufferLedger</h2> |
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| <div class="contentContainer"> |
| <ul class="inheritance"> |
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| <li> |
| <ul class="inheritance"> |
| <li>org.apache.drill.exec.memory.AllocationManager.BufferLedger</li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
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| <dl> |
| <dt>Enclosing class:</dt> |
| <dd><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.html" title="class in org.apache.drill.exec.memory">AllocationManager</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public class <span class="typeNameLabel">AllocationManager.BufferLedger</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">The reference manager that binds an allocator manager to a particular |
| BaseAllocator. Also responsible for creating a set of DrillBufs that share |
| a common fate and set of reference counts. As with AllocationManager, the |
| only reason this is public is due to DrillBuf being in io.netty.buffer |
| package.</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="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html#decrement-int-">decrement</a></span>(int decrement)</code> |
| <div class="block">Decrement the ledger's reference count.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html#getAccountedSize--">getAccountedSize</a></span>()</code> |
| <div class="block">Amount of memory accounted for by this ledger.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html" title="class in org.apache.drill.exec.memory">AllocationManager.BufferLedger</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html#getLedgerForAllocator-org.apache.drill.exec.memory.BufferAllocator-">getLedgerForAllocator</a></span>(<a href="../../../../../org/apache/drill/exec/memory/BufferAllocator.html" title="interface in org.apache.drill.exec.memory">BufferAllocator</a> allocator)</code> |
| <div class="block">Returns the ledger associated with a particular BufferAllocator.</div> |
| </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/drill/exec/memory/AllocationManager.BufferLedger.html#getSize--">getSize</a></span>()</code> |
| <div class="block">The total size (in bytes) of memory underlying this ledger.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../io/netty/buffer/UnsafeDirectLittleEndian.html" title="class in io.netty.buffer">UnsafeDirectLittleEndian</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html#getUnderlying--">getUnderlying</a></span>()</code> |
| <div class="block">Package visible for debugging/verification only.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>protected boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html#isOwningLedger--">isOwningLedger</a></span>()</code> |
| <div class="block">Package visible for debugging/verification only.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../io/netty/buffer/DrillBuf.html" title="class in io.netty.buffer">DrillBuf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html#newDrillBuf-int-int-">newDrillBuf</a></span>(int offset, |
| int length)</code> |
| <div class="block">Create a new DrillBuf associated with this AllocationManager and memory.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../io/netty/buffer/DrillBuf.html" title="class in io.netty.buffer">DrillBuf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html#newDrillBuf-int-int-org.apache.drill.exec.ops.BufferManager-">newDrillBuf</a></span>(int offset, |
| int length, |
| <a href="../../../../../org/apache/drill/exec/ops/BufferManager.html" title="interface in org.apache.drill.exec.ops">BufferManager</a> manager)</code> |
| <div class="block">Create a new DrillBuf associated with this AllocationManager and memory.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html#print-java.lang.StringBuilder-int-org.apache.drill.exec.memory.BaseAllocator.Verbosity-">print</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html?is-external=true" title="class or interface in java.lang">StringBuilder</a> sb, |
| int indent, |
| <a href="../../../../../org/apache/drill/exec/memory/BaseAllocator.Verbosity.html" title="enum in org.apache.drill.exec.memory">BaseAllocator.Verbosity</a> verbosity)</code> |
| <div class="block">Print the current ledger state to a the provided StringBuilder.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html#transferBalance-org.apache.drill.exec.memory.AllocationManager.BufferLedger-">transferBalance</a></span>(<a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html" title="class in org.apache.drill.exec.memory">AllocationManager.BufferLedger</a> target)</code> |
| <div class="block">Transfer any balance the current ledger has to the target ledger.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
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| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <!-- ============ METHOD DETAIL ========== --> |
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| </a> |
| <h3>Method Detail</h3> |
| <a name="transferBalance-org.apache.drill.exec.memory.AllocationManager.BufferLedger-"> |
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| </a> |
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| <h4>transferBalance</h4> |
| <pre>public boolean transferBalance(<a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html" title="class in org.apache.drill.exec.memory">AllocationManager.BufferLedger</a> target)</pre> |
| <div class="block">Transfer any balance the current ledger has to the target ledger. In the |
| case that the current ledger holds no memory, no transfer is made to the |
| new ledger.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>target</code> - The ledger to transfer ownership account to.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Whether transfer fit within target ledgers limits.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="print-java.lang.StringBuilder-int-org.apache.drill.exec.memory.BaseAllocator.Verbosity-"> |
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| <h4>print</h4> |
| <pre>public void print(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html?is-external=true" title="class or interface in java.lang">StringBuilder</a> sb, |
| int indent, |
| <a href="../../../../../org/apache/drill/exec/memory/BaseAllocator.Verbosity.html" title="enum in org.apache.drill.exec.memory">BaseAllocator.Verbosity</a> verbosity)</pre> |
| <div class="block">Print the current ledger state to a the provided StringBuilder.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>sb</code> - The StringBuilder to populate.</dd> |
| <dd><code>indent</code> - The level of indentation to position the data.</dd> |
| <dd><code>verbosity</code> - The level of verbosity to print.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>decrement</h4> |
| <pre>public int decrement(int decrement)</pre> |
| <div class="block">Decrement the ledger's reference count. If the ledger is decremented to |
| zero, this ledger should release its ownership back to the |
| AllocationManager</div> |
| </li> |
| </ul> |
| <a name="getLedgerForAllocator-org.apache.drill.exec.memory.BufferAllocator-"> |
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| </a> |
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| <h4>getLedgerForAllocator</h4> |
| <pre>public <a href="../../../../../org/apache/drill/exec/memory/AllocationManager.BufferLedger.html" title="class in org.apache.drill.exec.memory">AllocationManager.BufferLedger</a> getLedgerForAllocator(<a href="../../../../../org/apache/drill/exec/memory/BufferAllocator.html" title="interface in org.apache.drill.exec.memory">BufferAllocator</a> allocator)</pre> |
| <div class="block">Returns the ledger associated with a particular BufferAllocator. If the |
| BufferAllocator doesn't currently have a ledger associated with this |
| AllocationManager, a new one is created. This is placed on BufferLedger |
| rather than AllocationManager directly because DrillBufs don't have |
| access to AllocationManager and they are the ones responsible for |
| exposing the ability to associate multiple allocators with a particular |
| piece of underlying memory. Note that this will increment the reference |
| count of this ledger by one to ensure the ledger isn't destroyed before |
| use.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>allocator</code> - </dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The ledger associated with a particular BufferAllocator.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>newDrillBuf</h4> |
| <pre>public <a href="../../../../../io/netty/buffer/DrillBuf.html" title="class in io.netty.buffer">DrillBuf</a> newDrillBuf(int offset, |
| int length)</pre> |
| <div class="block">Create a new DrillBuf associated with this AllocationManager and memory. |
| Does not impact reference count. Typically used for slicing.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>offset</code> - The offset in bytes to start this new DrillBuf.</dd> |
| <dd><code>length</code> - The length in bytes that this DrillBuf will provide access to.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A new DrillBuf that shares references with all DrillBufs |
| associated with this BufferLedger</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="newDrillBuf-int-int-org.apache.drill.exec.ops.BufferManager-"> |
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| </a> |
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| <h4>newDrillBuf</h4> |
| <pre>public <a href="../../../../../io/netty/buffer/DrillBuf.html" title="class in io.netty.buffer">DrillBuf</a> newDrillBuf(int offset, |
| int length, |
| <a href="../../../../../org/apache/drill/exec/ops/BufferManager.html" title="interface in org.apache.drill.exec.ops">BufferManager</a> manager)</pre> |
| <div class="block">Create a new DrillBuf associated with this AllocationManager and memory.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>offset</code> - The offset in bytes to start this new DrillBuf.</dd> |
| <dd><code>length</code> - The length in bytes that this DrillBuf will provide access to.</dd> |
| <dd><code>manager</code> - An optional BufferManager argument that can be used to manage expansion of this DrillBuf.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A new DrillBuf that shares references with all DrillBufs associated with this BufferLedger.</dd> |
| </dl> |
| </li> |
| </ul> |
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| </a> |
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| <h4>getSize</h4> |
| <pre>public int getSize()</pre> |
| <div class="block">The total size (in bytes) of memory underlying this ledger.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Size in bytes</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getAccountedSize--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>getAccountedSize</h4> |
| <pre>public int getAccountedSize()</pre> |
| <div class="block">Amount of memory accounted for by this ledger. This is either getSize() if this is the owning ledger for the |
| memory or zero in the case that this is not the owning ledger associated with this memory.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Amount of accounted(owned) memory associated with this ledger.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getUnderlying--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>getUnderlying</h4> |
| <pre>protected <a href="../../../../../io/netty/buffer/UnsafeDirectLittleEndian.html" title="class in io.netty.buffer">UnsafeDirectLittleEndian</a> getUnderlying()</pre> |
| <div class="block">Package visible for debugging/verification only.</div> |
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| <h4>isOwningLedger</h4> |
| <pre>protected boolean isOwningLedger()</pre> |
| <div class="block">Package visible for debugging/verification only.</div> |
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| </ul> |
| </li> |
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