mbien commented on PR #7776:
URL: https://github.com/apache/netbeans/pull/7776#issuecomment-2367914882
> Occupied socket by another instance of the same program cannot be solved
by any if.
It might be different now but the first two semesters were essentially tasks
like: "Pass a long between two processes and implement it in 1-3 languages (or
stick to java but write one for corba, sockets and RMI)."
```java
public void main() throws IOException {
Path socketFile = Path.of("/tmp/connector");
long myPid = ProcessHandle.current().pid();
System.out.println("my pid "+myPid);
UnixDomainSocketAddress address =
UnixDomainSocketAddress.of(socketFile);
ByteBuffer bb = ByteBuffer.allocate(8);
if (Files.notExists(socketFile)) {
try (ServerSocketChannel server =
ServerSocketChannel.open(StandardProtocolFamily.UNIX)) {
server.bind(address);
try (SocketChannel channel = server.accept()) {
bb.putLong(0, myPid);
channel.write(bb);
}
}
} else {
try (SocketChannel channel =
SocketChannel.open(StandardProtocolFamily.UNIX)) {
channel.connect(address);
channel.read(bb);
System.out.println("other program pid: "+bb.getLong(0));
}
Files.delete(socketFile);
}
}
```
It might no longer be common, but I don't think an IDE should prohibit to
run things like that due to extra process-cancel magic. I think once the
toolbar is there and other UX features are implemented it all will "fall into
place" and make sense for newbies. The cancel-other feature might still be
useful as toggle action on a toolbar - but I don't think it should be the
default.
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