timboudreau commented on pull request #2232:
URL: https://github.com/apache/netbeans/pull/2232#issuecomment-656788918
Not to mention that it necessarily introduces some locking into the picture,
since using the controller and setting the proxy lookup is a potential race:
```java
public static final class Controller {
private Lookup[] initialLookups;
private Executor initialExecutor;
private ProxyLookup proxyLookup;
public Controller(Lookup... lookups) {
initialLookups = lookups;
}
public Controller() {
initialLookups = new Lookup[0];
}
public synchronized void setLookups(Executor exe, Lookup... lookups)
{
if (proxyLookup != null) {
proxyLookup.setLookups(exe, lookups);
} else {
initialLookups = Arrays.copyOf(lookups, lookups.length);
initialExecutor = exe;
}
}
public void setLookups(Lookup... lookups) {
setLookups(null, lookups);
}
synchronized void setProxyLookup(ProxyLookup lkp) {
if (this.proxyLookup != null) {
throw new IllegalStateException("Attempting to use "
+ "ProxyLookup.Controller for more than one "
+ "ProxyLookup is illegal");
}
lkp.setLookups(initialExecutor, initialLookups);
}
}
```
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