antville/helma
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replaced special NullNode class with a generic Node object

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built with a special constructor.
This commit is contained in:
hns 2001-08-04 11:45:52 +00:00
parent f9386a2286
commit c3f4b73fe3
1 changed files with 11 additions and 8 deletions
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19
src/helma/objectmodel/db/NodeManager.java
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@ -52,7 +52,7 @@ public final class NodeManager {
app.logEvent ("set up node cache ("+cacheSize+")");
safe = new WrappedNodeManager (this);
// nullNode = new Node ("nullNode", "nullNode", null, safe);
// nullNode = new Node ();
String replicationUrl = props.getProperty ("replicationUrl");
if (replicationUrl != null) {
@ -184,7 +184,7 @@ public final class NodeManager {
if (node != null) {
synchronized (cache) {
Node oldnode = (Node) cache.put (node.getKey (), node);
if (oldnode != null && oldnode.getState () != Node.INVALID && !(oldnode instanceof NullNode)) {
if (oldnode != null && oldnode.getState () != Node.INVALID && !oldnode.isNullNode ()) {
cache.put (node.getKey (), oldnode);
node = oldnode;
}
@ -236,7 +236,7 @@ public final class NodeManager {
// we need further checks for subnodes fetched by name if the subnodes were changed.
if (!rel.virtual && rel.subnodesAreProperties && node != null && node.getState() != Node.INVALID) {
// check if node is null node (cached null)
if (node instanceof NullNode) {
if (node.isNullNode ()) {
if (node.created() < rel.other.getLastDataChange ())
node = null; // cached null not valid anymore
} else if (app.doesSubnodeChecking () && home.contains (node) < 0) {
@ -258,7 +258,7 @@ public final class NodeManager {
// check if node is already in cache with primary key
Node oldnode = (Node) cache.put (primKey, node);
// no need to check for oldnode != node because we fetched a new node from db
if (oldnode != null && !(oldnode instanceof NullNode) && oldnode.getState () != Node.INVALID) {
if (oldnode != null && !oldnode.isNullNode() && oldnode.getState () != Node.INVALID) {
cache.put (primKey, oldnode);
if (!keyIsPrimary) {
cache.put (key, oldnode);
@ -272,12 +272,12 @@ public final class NodeManager {
} else {
// node fetched from db is null, cache result using nullNode
synchronized (cache) {
Node oldnode = (Node) cache.put (key, new NullNode ());
Node oldnode = (Node) cache.put (key, new Node ());
// we ignore the case that onother thread has created the node in the meantime
return null;
}
}
} else if (node instanceof NullNode) {
} else if (node.isNullNode ()) {
// the nullNode caches a null value, i.e. an object that doesn't exist
return null;
} else {
@ -634,8 +634,11 @@ public final class NodeManager {
(Key) new SyntheticKey (k, kstr);
retval.add (new NodeHandle (key));
// if these are groupby nodes, evict nullNode keys
if (rel.groupby != null && cache.get (key) instanceof NullNode)
evictKey (key);
if (rel.groupby != null) {
Node n = (Node) cache.get (key);
if (n != null && n.isNullNode ())
evictKey (key);
}
}
} finally {