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<div class="subTitle">org.janusgraph.diskstorage.locking</div>
<h2 title="Class AbstractLocker" class="title">Class AbstractLocker<S extends <a href="../../../../org/janusgraph/diskstorage/locking/LockStatus.html" title="interface in org.janusgraph.diskstorage.locking">LockStatus</a>></h2>
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<li>org.janusgraph.diskstorage.locking.AbstractLocker<S></li>
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<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>S</code> - An implementation-specific type holding information about a single
lock; see <a href="../../../../org/janusgraph/diskstorage/locking/consistentkey/ConsistentKeyLockStatus.html" title="class in org.janusgraph.diskstorage.locking.consistentkey"><code>ConsistentKeyLockStatus</code></a> for an example</dd>
</dl>
<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../org/janusgraph/diskstorage/locking/Locker.html" title="interface in org.janusgraph.diskstorage.locking">Locker</a></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../org/janusgraph/diskstorage/locking/consistentkey/ConsistentKeyLocker.html" title="class in org.janusgraph.diskstorage.locking.consistentkey">ConsistentKeyLocker</a></dd>
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<pre>public abstract class <span class="typeNameLabel">AbstractLocker<S extends <a href="../../../../org/janusgraph/diskstorage/locking/LockStatus.html" title="interface in org.janusgraph.diskstorage.locking">LockStatus</a>></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>
implements <a href="../../../../org/janusgraph/diskstorage/locking/Locker.html" title="interface in org.janusgraph.diskstorage.locking">Locker</a></pre>
<div class="block">Abstract base class for building lockers. Implements locking between threads
using <a href="../../../../org/janusgraph/diskstorage/locking/LocalLockMediator.html" title="class in org.janusgraph.diskstorage.locking"><code>LocalLockMediator</code></a> but delegates inter-process lock resolution
to its subclasses.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/janusgraph/diskstorage/locking/consistentkey/ConsistentKeyLocker.html" title="class in org.janusgraph.diskstorage.locking.consistentkey"><code>ConsistentKeyLocker</code></a></dd>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static class </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.Builder.html" title="class in org.janusgraph.diskstorage.locking">AbstractLocker.Builder</a><<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.Builder.html" title="type parameter in AbstractLocker.Builder">S</a>,<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.Builder.html" title="type parameter in AbstractLocker.Builder">B</a> extends <a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.Builder.html" title="class in org.janusgraph.diskstorage.locking">AbstractLocker.Builder</a><<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.Builder.html" title="type parameter in AbstractLocker.Builder">S</a>,<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.Builder.html" title="type parameter in AbstractLocker.Builder">B</a>>></span></code>
<div class="block">Abstract builder for this Locker implementation.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<td class="colFirst"><code>protected <a href="../../../../org/janusgraph/diskstorage/locking/LocalLockMediator.html" title="class in org.janusgraph.diskstorage.locking">LocalLockMediator</a><<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#llm">llm</a></span></code>
<div class="block">Resolves lock contention by multiple threads.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html?is-external=true" title="class or interface in java.time">Duration</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#lockExpire">lockExpire</a></span></code>
<div class="block">The amount of time, in <a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#times"><code>times</code></a><code>.getUnit()</code>, that may pass
after writing a lock before it is considered to be invalid and
automatically unlocked.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../../../org/janusgraph/diskstorage/locking/LockerState.html" title="class in org.janusgraph.diskstorage.locking">LockerState</a><<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html" title="type parameter in AbstractLocker">S</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#lockState">lockState</a></span></code>
<div class="block">Stores all information about all locks this implementation has taken on
behalf of any <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue"><code>StoreTransaction</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#log">log</a></span></code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#rid">rid</a></span></code>
<div class="block">Uniquely identifies a process within a domain (or across all domains,
though only intra-domain uniqueness is required)</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../org/janusgraph/diskstorage/locking/consistentkey/ConsistentKeyLockerSerializer.html" title="class in org.janusgraph.diskstorage.locking.consistentkey">ConsistentKeyLockerSerializer</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#serializer">serializer</a></span></code>
<div class="block">This is sort-of Cassandra/HBase specific.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../../../org/janusgraph/diskstorage/util/time/TimestampProvider.html" title="interface in org.janusgraph.diskstorage.util.time">TimestampProvider</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#times">times</a></span></code>
<div class="block">Sole source of time.</div>
</td>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#AbstractLocker-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.util.time.TimestampProvider-org.janusgraph.diskstorage.locking.consistentkey.ConsistentKeyLockerSerializer-org.janusgraph.diskstorage.locking.LocalLockMediator-org.janusgraph.diskstorage.locking.LockerState-java.time.Duration-org.slf4j.Logger-">AbstractLocker</a></span>(<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a> rid,
<a href="../../../../org/janusgraph/diskstorage/util/time/TimestampProvider.html" title="interface in org.janusgraph.diskstorage.util.time">TimestampProvider</a> times,
<a href="../../../../org/janusgraph/diskstorage/locking/consistentkey/ConsistentKeyLockerSerializer.html" title="class in org.janusgraph.diskstorage.locking.consistentkey">ConsistentKeyLockerSerializer</a> serializer,
<a href="../../../../org/janusgraph/diskstorage/locking/LocalLockMediator.html" title="class in org.janusgraph.diskstorage.locking">LocalLockMediator</a><<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>> llm,
<a href="../../../../org/janusgraph/diskstorage/locking/LockerState.html" title="class in org.janusgraph.diskstorage.locking">LockerState</a><<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html" title="type parameter in AbstractLocker">S</a>> lockState,
<a href="https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html?is-external=true" title="class or interface in java.time">Duration</a> lockExpire,
org.slf4j.Logger log)</code> </td>
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<h3>Method Summary</h3>
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<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><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#checkLocks-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">checkLocks</a></span>(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)</code>
<div class="block">Verify that all previous <a href="../../../../org/janusgraph/diskstorage/locking/Locker.html#writeLock-org.janusgraph.diskstorage.util.KeyColumn-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-"><code>Locker.writeLock(KeyColumn, StoreTransaction)</code></a>
calls with <code>tx</code> actually succeeded.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#checkSingleLock-org.janusgraph.diskstorage.util.KeyColumn-S-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">checkSingleLock</a></span>(<a href="../../../../org/janusgraph/diskstorage/util/KeyColumn.html" title="class in org.janusgraph.diskstorage.util">KeyColumn</a> lockID,
<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html" title="type parameter in AbstractLocker">S</a> lockStatus,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)</code>
<div class="block">Try to verify that the lock identified by <code>lockID</code> is already held
by <code>tx</code>.</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/janusgraph/diskstorage/locking/AbstractLocker.html#deleteLocks-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">deleteLocks</a></span>(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)</code>
<div class="block">Release every lock currently held by <code>tx</code>.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#deleteSingleLock-org.janusgraph.diskstorage.util.KeyColumn-S-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">deleteSingleLock</a></span>(<a href="../../../../org/janusgraph/diskstorage/util/KeyColumn.html" title="class in org.janusgraph.diskstorage.util">KeyColumn</a> lockID,
<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html" title="type parameter in AbstractLocker">S</a> lockStatus,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)</code>
<div class="block">Try to unlock/release/delete the lock identified by <code>lockID</code> and
both held by and verified for <code>tx</code>.</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/janusgraph/diskstorage/locking/AbstractLocker.html#writeLock-org.janusgraph.diskstorage.util.KeyColumn-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">writeLock</a></span>(<a href="../../../../org/janusgraph/diskstorage/util/KeyColumn.html" title="class in org.janusgraph.diskstorage.util">KeyColumn</a> lockID,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)</code>
<div class="block">Attempt to acquire/take/claim/write the lock named by <code>lockID</code>.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected abstract <a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html" title="type parameter in AbstractLocker">S</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#writeSingleLock-org.janusgraph.diskstorage.util.KeyColumn-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">writeSingleLock</a></span>(<a href="../../../../org/janusgraph/diskstorage/util/KeyColumn.html" title="class in org.janusgraph.diskstorage.util">KeyColumn</a> lockID,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)</code>
<div class="block">Try to take/acquire/write/claim a lock uniquely identified within this
<code>Locker</code> by the <code>lockID</code> argument on behalf of <code>tx</code>.</div>
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<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>
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<h3>Field Detail</h3>
<a name="rid">
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<pre>protected final <a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a> rid</pre>
<div class="block">Uniquely identifies a process within a domain (or across all domains,
though only intra-domain uniqueness is required)</div>
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<a name="times">
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<h4>times</h4>
<pre>protected final <a href="../../../../org/janusgraph/diskstorage/util/time/TimestampProvider.html" title="interface in org.janusgraph.diskstorage.util.time">TimestampProvider</a> times</pre>
<div class="block">Sole source of time. All fields of type long that represent times or
durations should be expressed in terms of
<a href="../../../../org/janusgraph/diskstorage/util/time/TimestampProvider.html#getUnit--"><code>TimestampProvider.getUnit()</code></a>. Furthermore, if the locking backend
allows the client to set a timestamp on writes, those timestamps should
be in the same units.
<p>
Don't call <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/System.html?is-external=true#currentTimeMillis--" title="class or interface in java.lang"><code>System.currentTimeMillis()</code></a> or
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/System.html?is-external=true#nanoTime--" title="class or interface in java.lang"><code>System.nanoTime()</code></a> directly. Use only this object. This object is
replaced with a mock during testing to give tests exact control over the
flow of time.</div>
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<h4>serializer</h4>
<pre>protected final <a href="../../../../org/janusgraph/diskstorage/locking/consistentkey/ConsistentKeyLockerSerializer.html" title="class in org.janusgraph.diskstorage.locking.consistentkey">ConsistentKeyLockerSerializer</a> serializer</pre>
<div class="block">This is sort-of Cassandra/HBase specific. It concatenates
<a href="../../../../org/janusgraph/diskstorage/util/KeyColumn.html" title="class in org.janusgraph.diskstorage.util"><code>KeyColumn</code></a> arguments into a single StaticBuffer containing the key
followed by the column and vice-versa.</div>
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<pre>protected final <a href="../../../../org/janusgraph/diskstorage/locking/LocalLockMediator.html" title="class in org.janusgraph.diskstorage.locking">LocalLockMediator</a><<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>> llm</pre>
<div class="block">Resolves lock contention by multiple threads.</div>
</li>
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<a name="lockState">
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<h4>lockState</h4>
<pre>protected final <a href="../../../../org/janusgraph/diskstorage/locking/LockerState.html" title="class in org.janusgraph.diskstorage.locking">LockerState</a><<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html" title="type parameter in AbstractLocker">S</a> extends <a href="../../../../org/janusgraph/diskstorage/locking/LockStatus.html" title="interface in org.janusgraph.diskstorage.locking">LockStatus</a>> lockState</pre>
<div class="block">Stores all information about all locks this implementation has taken on
behalf of any <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue"><code>StoreTransaction</code></a>. It is parameterized in a type
specific to the concrete subclass, so that concrete implementations can
store information specific to their locking primitives.</div>
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<h4>lockExpire</h4>
<pre>protected final <a href="https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html?is-external=true" title="class or interface in java.time">Duration</a> lockExpire</pre>
<div class="block">The amount of time, in <a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#times"><code>times</code></a><code>.getUnit()</code>, that may pass
after writing a lock before it is considered to be invalid and
automatically unlocked.</div>
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<h4>log</h4>
<pre>protected final org.slf4j.Logger log</pre>
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<h3>Constructor Detail</h3>
<a name="AbstractLocker-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.util.time.TimestampProvider-org.janusgraph.diskstorage.locking.consistentkey.ConsistentKeyLockerSerializer-org.janusgraph.diskstorage.locking.LocalLockMediator-org.janusgraph.diskstorage.locking.LockerState-java.time.Duration-org.slf4j.Logger-">
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<h4>AbstractLocker</h4>
<pre>public AbstractLocker(<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a> rid,
<a href="../../../../org/janusgraph/diskstorage/util/time/TimestampProvider.html" title="interface in org.janusgraph.diskstorage.util.time">TimestampProvider</a> times,
<a href="../../../../org/janusgraph/diskstorage/locking/consistentkey/ConsistentKeyLockerSerializer.html" title="class in org.janusgraph.diskstorage.locking.consistentkey">ConsistentKeyLockerSerializer</a> serializer,
<a href="../../../../org/janusgraph/diskstorage/locking/LocalLockMediator.html" title="class in org.janusgraph.diskstorage.locking">LocalLockMediator</a><<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>> llm,
<a href="../../../../org/janusgraph/diskstorage/locking/LockerState.html" title="class in org.janusgraph.diskstorage.locking">LockerState</a><<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html" title="type parameter in AbstractLocker">S</a>> lockState,
<a href="https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html?is-external=true" title="class or interface in java.time">Duration</a> lockExpire,
org.slf4j.Logger log)</pre>
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<h4>writeSingleLock</h4>
<pre>protected abstract <a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html" title="type parameter in AbstractLocker">S</a> writeSingleLock(<a href="../../../../org/janusgraph/diskstorage/util/KeyColumn.html" title="class in org.janusgraph.diskstorage.util">KeyColumn</a> lockID,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">Try to take/acquire/write/claim a lock uniquely identified within this
<code>Locker</code> by the <code>lockID</code> argument on behalf of <code>tx</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>lockID</code> - identifies the lock</dd>
<dd><code>tx</code> - identifies the process claiming this lock</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <code>LockStatus</code> implementation on successful lock acquisition</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - if the lock could not be taken/acquired/written/claimed or
the attempted write encountered an error</dd>
</dl>
</li>
</ul>
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<h4>checkSingleLock</h4>
<pre>protected abstract void checkSingleLock(<a href="../../../../org/janusgraph/diskstorage/util/KeyColumn.html" title="class in org.janusgraph.diskstorage.util">KeyColumn</a> lockID,
<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html" title="type parameter in AbstractLocker">S</a> lockStatus,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">Try to verify that the lock identified by <code>lockID</code> is already held
by <code>tx</code>. The <code>lockStatus</code> argument refers to the object
returned by a previous call to
<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#writeSingleLock-org.janusgraph.diskstorage.util.KeyColumn-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-"><code>writeSingleLock(KeyColumn, StoreTransaction)</code></a>. This should be a
read-only operation: return if the lock is already held, but this method
finds that it is not held, then throw an exception instead of trying to
acquire it.
<p>
This method is only useful with nonblocking locking implementations try
to lock and then check the outcome of the attempt in two separate stages.
For implementations that build <code>writeSingleLock(...)</code> on a
synchronous locking primitive, such as a blocking <code>lock()</code> method
or a blocking semaphore <code>p()</code>, this method is redundant with
<code>writeSingleLock(...)</code> and may unconditionally return true.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>lockID</code> - identifies the lock to check</dd>
<dd><code>lockStatus</code> - the result of a prior successful <code>writeSingleLock(...)</code>
call on this <code>lockID</code> and <code>tx</code></dd>
<dd><code>tx</code> - identifies the process claiming this lock</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - if the lock fails the check or if the attempted check
encountered an error</dd>
</dl>
</li>
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<h4>deleteSingleLock</h4>
<pre>protected abstract void deleteSingleLock(<a href="../../../../org/janusgraph/diskstorage/util/KeyColumn.html" title="class in org.janusgraph.diskstorage.util">KeyColumn</a> lockID,
<a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html" title="type parameter in AbstractLocker">S</a> lockStatus,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">Try to unlock/release/delete the lock identified by <code>lockID</code> and
both held by and verified for <code>tx</code>. This method is only called with
arguments for which <a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#writeSingleLock-org.janusgraph.diskstorage.util.KeyColumn-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-"><code>writeSingleLock(KeyColumn, StoreTransaction)</code></a>
and <a href="../../../../org/janusgraph/diskstorage/locking/AbstractLocker.html#checkSingleLock-org.janusgraph.diskstorage.util.KeyColumn-S-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-"><code>checkSingleLock(KeyColumn, LockStatus, StoreTransaction)</code></a>
both returned successfully (i.e. without exceptions).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>lockID</code> - identifies the lock to release</dd>
<dd><code>lockStatus</code> - the result of a prior successful <code>writeSingleLock(...)</code>
followed by a successful <code>checkSingleLock(...)</code></dd>
<dd><code>tx</code> - identifies the process that wrote and checked this lock</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - if the lock could not be released/deleted or if the attempted
delete encountered an error</dd>
</dl>
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<h4>writeLock</h4>
<pre>public void writeLock(<a href="../../../../org/janusgraph/diskstorage/util/KeyColumn.html" title="class in org.janusgraph.diskstorage.util">KeyColumn</a> lockID,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)
throws <a href="../../../../org/janusgraph/diskstorage/locking/TemporaryLockingException.html" title="class in org.janusgraph.diskstorage.locking">TemporaryLockingException</a>,
<a href="../../../../org/janusgraph/diskstorage/locking/PermanentLockingException.html" title="class in org.janusgraph.diskstorage.locking">PermanentLockingException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/janusgraph/diskstorage/locking/Locker.html#writeLock-org.janusgraph.diskstorage.util.KeyColumn-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">Locker</a></code></span></div>
<div class="block">Attempt to acquire/take/claim/write the lock named by <code>lockID</code>.
<p>
Returns on success and throws an exception on failure.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/Locker.html#writeLock-org.janusgraph.diskstorage.util.KeyColumn-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">writeLock</a></code> in interface <code><a href="../../../../org/janusgraph/diskstorage/locking/Locker.html" title="interface in org.janusgraph.diskstorage.locking">Locker</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>lockID</code> - the lock to acquire</dd>
<dd><code>tx</code> - the transaction attempting to acquire the lock</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/TemporaryLockingException.html" title="class in org.janusgraph.diskstorage.locking">TemporaryLockingException</a></code> - a failure likely to disappear if the call is retried</dd>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/PermanentLockingException.html" title="class in org.janusgraph.diskstorage.locking">PermanentLockingException</a></code> - a failure unlikely to disappear if the call is retried</dd>
</dl>
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<h4>checkLocks</h4>
<pre>public void checkLocks(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)
throws <a href="../../../../org/janusgraph/diskstorage/locking/TemporaryLockingException.html" title="class in org.janusgraph.diskstorage.locking">TemporaryLockingException</a>,
<a href="../../../../org/janusgraph/diskstorage/locking/PermanentLockingException.html" title="class in org.janusgraph.diskstorage.locking">PermanentLockingException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/janusgraph/diskstorage/locking/Locker.html#checkLocks-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">Locker</a></code></span></div>
<div class="block">Verify that all previous <a href="../../../../org/janusgraph/diskstorage/locking/Locker.html#writeLock-org.janusgraph.diskstorage.util.KeyColumn-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-"><code>Locker.writeLock(KeyColumn, StoreTransaction)</code></a>
calls with <code>tx</code> actually succeeded.
<p>
Returns on success and throws an exception on failure.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/Locker.html#checkLocks-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">checkLocks</a></code> in interface <code><a href="../../../../org/janusgraph/diskstorage/locking/Locker.html" title="interface in org.janusgraph.diskstorage.locking">Locker</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>tx</code> - the transaction attempting to check the result of previous
<code>writeLock(..., tx)</code> calls in which it was the
<code>tx</code> argument</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/TemporaryLockingException.html" title="class in org.janusgraph.diskstorage.locking">TemporaryLockingException</a></code> - a failure likely to disappear if the call is retried</dd>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/PermanentLockingException.html" title="class in org.janusgraph.diskstorage.locking">PermanentLockingException</a></code> - a failure unlikely to disappear if the call is retried</dd>
</dl>
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</ul>
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<h4>deleteLocks</h4>
<pre>public void deleteLocks(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a> tx)
throws <a href="../../../../org/janusgraph/diskstorage/locking/TemporaryLockingException.html" title="class in org.janusgraph.diskstorage.locking">TemporaryLockingException</a>,
<a href="../../../../org/janusgraph/diskstorage/locking/PermanentLockingException.html" title="class in org.janusgraph.diskstorage.locking">PermanentLockingException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/janusgraph/diskstorage/locking/Locker.html#deleteLocks-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">Locker</a></code></span></div>
<div class="block">Release every lock currently held by <code>tx</code>.
<p>
Returns on success and throws an exception on failure.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/Locker.html#deleteLocks-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">deleteLocks</a></code> in interface <code><a href="../../../../org/janusgraph/diskstorage/locking/Locker.html" title="interface in org.janusgraph.diskstorage.locking">Locker</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>tx</code> - the transaction attempting to delete locks taken in previous
<code>writeLock(..., tx)</code> calls in which it was the
<code>tx</code> argument</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/TemporaryLockingException.html" title="class in org.janusgraph.diskstorage.locking">TemporaryLockingException</a></code> - a failure likely to disappear if the call is retried</dd>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/PermanentLockingException.html" title="class in org.janusgraph.diskstorage.locking">PermanentLockingException</a></code> - a failure unlikely to disappear if the call is retried</dd>
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