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Optimize synchronization in updatePrototypes(): keep out of synchronized section if possible

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hns 2005-03-24 18:24:51 +00:00
parent 7af9cc6a22
commit 0856559870
1 changed files with 40 additions and 34 deletions
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74
src/helma/scripting/rhino/RhinoCore.java
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@ -51,7 +51,7 @@ public final class RhinoCore implements ScopeProvider {
Hashtable prototypes;
// timestamp of last type update
long lastUpdate = 0;
volatile long lastUpdate = 0;
// the wrap factory
WrapFactory wrapper;
@ -310,49 +310,55 @@ public final class RhinoCore implements ScopeProvider {
* here is to check for update those prototypes which already have been compiled
* before. Others will be updated/compiled on demand.
*/
public synchronized void updatePrototypes() throws IOException {
public void updatePrototypes() throws IOException {
if ((System.currentTimeMillis() - lastUpdate) < 1000L) {
return;
}
// init prototypes and/or update prototype checksums
app.typemgr.checkPrototypes();
// get a collection of all prototypes (code directories)
Collection protos = app.getPrototypes();
// in order to respect inter-prototype dependencies, we try to update
// the global prototype before all other prototypes, and parent
// prototypes before their descendants.
HashSet checked = new HashSet(protos.size()*2);
TypeInfo type = (TypeInfo) prototypes.get("global");
if (type != null) {
updatePrototype(type, checked);
}
for (Iterator i = protos.iterator(); i.hasNext();) {
Prototype proto = (Prototype) i.next();
if (checked.contains(proto)) {
continue;
synchronized(this) {
if ((System.currentTimeMillis() - lastUpdate) < 1000L) {
return;
}
type = (TypeInfo) prototypes.get(proto.getLowerCaseName());
// init prototypes and/or update prototype checksums
app.typemgr.checkPrototypes();
if (type == null) {
// a prototype we don't know anything about yet. Init local update info.
initPrototype(proto);
} else if (type.lastUpdate > -1) {
// only need to update prototype if it has already been initialized.
// otherwise, this will be done on demand.
// get a collection of all prototypes (code directories)
Collection protos = app.getPrototypes();
// in order to respect inter-prototype dependencies, we try to update
// the global prototype before all other prototypes, and parent
// prototypes before their descendants.
HashSet checked = new HashSet(protos.size() * 2);
TypeInfo type = (TypeInfo) prototypes.get("global");
if (type != null) {
updatePrototype(type, checked);
}
}
lastUpdate = System.currentTimeMillis();
for (Iterator i = protos.iterator(); i.hasNext();) {
Prototype proto = (Prototype) i.next();
if (checked.contains(proto)) {
continue;
}
type = (TypeInfo) prototypes.get(proto.getLowerCaseName());
if (type == null) {
// a prototype we don't know anything about yet. Init local update info.
initPrototype(proto);
} else if (type.lastUpdate > -1) {
// only need to update prototype if it has already been initialized.
// otherwise, this will be done on demand.
updatePrototype(type, checked);
}
}
lastUpdate = System.currentTimeMillis();
}
}
/**