gianm commented on code in PR #20074:
URL: https://github.com/apache/druid/pull/20074#discussion_r3965210895
##########
processing/src/main/java/org/apache/druid/common/asyncresource/SettableAsyncResource.java:
##########
@@ -180,7 +191,8 @@ public void setException(Throwable t)
@Override
public synchronized boolean isReady()
{
- return state == State.READY;
+ // a closed resource is complete too (acquisition is over and get()
reports why)
+ return state == State.READY || state == State.CLOSED;
Review Comment:
Behavior is strange here for releasable resources. After `release()`,
`isReady()` becomes `false`, and then it can become `true` after after
`CLOSED`. I think it'd make more sense for it to be `false` for a `CLOSED` that
occurs after a `release()`
##########
processing/src/main/java/org/apache/druid/common/asyncresource/AsyncResourceCanceledException.java:
##########
@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.druid.common.asyncresource;
+
+import java.util.concurrent.CancellationException;
+
+/**
+ * Thrown by {@link AsyncResource#get()} when {@link AsyncResource#close()}
canceled acquisition before the resource
+ * became available, i.e. the consumer that owned the resource gave up waiting
for it. Extends
+ * {@link CancellationException} so that consumers who only care that
something was canceled need no special handling.
+ */
+public class AsyncResourceCanceledException extends CancellationException
Review Comment:
Check for this and block it in `SettableAsyncResource#setException`? Funky
stuff may happen if this is explicitly set, and it seems good to not allow that.
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