First pass at a distributed lock system. Barbie says, "Concurrency is
hard!" git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4533 542714f4-19e9-0310-aa3c-eee0fc999fb1
This commit is contained in:
Andrzej Kapolka
@@ -31,6 +31,23 @@ import com.threerings.presents.dobj.DSet;
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*/
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public class NodeObject extends DObject
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{
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// AUTO-GENERATED: FIELDS START
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/** The field name of the <code>clients</code> field. */
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public static final String CLIENTS = "clients";
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/** The field name of the <code>locks</code> field. */
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public static final String LOCKS = "locks";
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/** The field name of the <code>acquiringLock</code> field. */
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public static final String ACQUIRING_LOCK = "acquiringLock";
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/** The field name of the <code>releasingLock</code> field. */
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public static final String RELEASING_LOCK = "releasingLock";
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/** The field name of the <code>cacheData</code> field. */
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public static final String CACHE_DATA = "cacheData";
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// AUTO-GENERATED: FIELDS END
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/** Used for informing peers of changes to persistent data. */
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public static class CacheData implements Streamable
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{
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@@ -49,20 +66,21 @@ public class NodeObject extends DObject
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this.cache = cache;
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this.data = data;
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}
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}
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// AUTO-GENERATED: FIELDS START
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/** The field name of the <code>clients</code> field. */
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public static final String CLIENTS = "clients";
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/** The field name of the <code>cacheData</code> field. */
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public static final String CACHE_DATA = "cacheData";
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// AUTO-GENERATED: FIELDS END
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/** Contains information on all clients connected to this node. */
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public DSet<ClientInfo> clients = new DSet<ClientInfo>();
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/** This node's view of the peer lock set. A lock is acquired only when it has been added to
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* all peers' sets, and is released only when it has been removed from all peers' sets. */
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public DSet<Lock> locks = new DSet<Lock>();
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/** Used to broadcast a node's desire to acquire a lock. */
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public Lock.Name acquiringLock;
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/** Used to broadcast a node's desire to release a lock. */
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public Lock.Name releasingLock;
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/** A field we use to broadcast changes to possible cached data. */
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public CacheData cacheData;
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@@ -115,6 +133,86 @@ public class NodeObject extends DObject
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this.clients = clone;
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}
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/**
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* Requests that the specified entry be added to the
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* <code>locks</code> set. The set will not change until the event is
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* actually propagated through the system.
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*/
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public void addToLocks (Lock elem)
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{
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requestEntryAdd(LOCKS, locks, elem);
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}
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/**
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* Requests that the entry matching the supplied key be removed from
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* the <code>locks</code> set. The set will not change until the
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* event is actually propagated through the system.
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*/
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public void removeFromLocks (Comparable key)
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{
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requestEntryRemove(LOCKS, locks, key);
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}
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/**
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* Requests that the specified entry be updated in the
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* <code>locks</code> set. The set will not change until the event is
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* actually propagated through the system.
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*/
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public void updateLocks (Lock elem)
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{
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requestEntryUpdate(LOCKS, locks, elem);
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}
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/**
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* Requests that the <code>locks</code> field be set to the
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* specified value. Generally one only adds, updates and removes
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* entries of a distributed set, but certain situations call for a
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* complete replacement of the set value. The local value will be
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* updated immediately and an event will be propagated through the
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* system to notify all listeners that the attribute did
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* change. Proxied copies of this object (on clients) will apply the
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* value change when they received the attribute changed notification.
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*/
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public void setLocks (DSet<com.threerings.presents.peer.data.Lock> value)
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{
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requestAttributeChange(LOCKS, value, this.locks);
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@SuppressWarnings("unchecked") DSet<com.threerings.presents.peer.data.Lock> clone =
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(value == null) ? null : value.typedClone();
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this.locks = clone;
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}
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/**
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* Requests that the <code>acquiringLock</code> field be set to the
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* specified value. The local value will be updated immediately and an
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* event will be propagated through the system to notify all listeners
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* that the attribute did change. Proxied copies of this object (on
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* clients) will apply the value change when they received the
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* attribute changed notification.
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*/
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public void setAcquiringLock (Lock.Name value)
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{
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Lock.Name ovalue = this.acquiringLock;
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requestAttributeChange(
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ACQUIRING_LOCK, value, ovalue);
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this.acquiringLock = value;
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}
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/**
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* Requests that the <code>releasingLock</code> field be set to the
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* specified value. The local value will be updated immediately and an
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* event will be propagated through the system to notify all listeners
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* that the attribute did change. Proxied copies of this object (on
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* clients) will apply the value change when they received the
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* attribute changed notification.
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*/
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public void setReleasingLock (Lock.Name value)
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{
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Lock.Name ovalue = this.releasingLock;
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requestAttributeChange(
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RELEASING_LOCK, value, ovalue);
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this.releasingLock = value;
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}
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/**
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* Requests that the <code>cacheData</code> field be set to the
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* specified value. The local value will be updated immediately and an
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