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Exploit DiscoveryNode immutability in toString 

DiscoveryNode is immutable yet we rebuild DiscoveryNode#toString on
every invocation. Most importantly, this just leads to unnecessary
allocations. This is most germane to ZenDiscovery and the processing of
cluster states where DiscoveryNode#toString is invoked when submitting
update tasks and processing cluster state updates.

Closes #17543
This commit is contained in:
Jason Tedor 2016-04-05 12:13:18 -04:00
parent 8430b379d8
commit e76038e076
1 changed files with 21 additions and 16 deletions
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7
core/src/main/java/org/elasticsearch/cluster/node/DiscoveryNode.java
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@ -312,8 +312,11 @@ public class DiscoveryNode implements Writeable<DiscoveryNode>, ToXContent {
return nodeId.hashCode(); return nodeId.hashCode();
} }
private String toString;
@Override @Override
public String toString() { public String toString() {
if (toString == null) {
StringBuilder sb = new StringBuilder(); StringBuilder sb = new StringBuilder();
if (nodeName.length() > 0) { if (nodeName.length() > 0) {
sb.append('{').append(nodeName).append('}'); sb.append('{').append(nodeName).append('}');
@ -330,7 +333,9 @@ public class DiscoveryNode implements Writeable<DiscoveryNode>, ToXContent {
if (!attributes.isEmpty()) { if (!attributes.isEmpty()) {
sb.append(attributes); sb.append(attributes);
} }
return sb.toString(); toString = sb.toString();
}
return toString;
} }
@Override @Override