(asterixdb) 05/27: [NO ISSUE][*HYR][MISC] += Lazy helper for deferred initialization

[mb...@apache.org]

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mblow pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/asterixdb.git

commit 15067de0e0de840eb8f8e421696f79171c445484
Author: Michael Blow <mi...@couchbase.com>
AuthorDate: Wed Sep 3 16:32:47 2025 -0400

    [NO ISSUE][*HYR][MISC] += Lazy helper for deferred initialization
    
    Ext-ref: MB-68256
    Change-Id: I9912c03cf3949dae86eb8af4f159143f660061d4
    Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/20287
    Reviewed-by: Michael Blow <mb...@apache.org>
    Reviewed-by: Ali Alsuliman <al...@gmail.com>
    Integration-Tests: Jenkins <je...@fulliautomatix.ics.uci.edu>
    Tested-by: Jenkins <je...@fulliautomatix.ics.uci.edu>
---
 .../java/org/apache/hyracks/api/util/Lazy.java     | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/hyracks-fullstack/hyracks/hyracks-api/src/main/java/org/apache/hyracks/api/util/Lazy.java b/hyracks-fullstack/hyracks/hyracks-api/src/main/java/org/apache/hyracks/api/util/Lazy.java
new file mode 100644
index 0000000000..28dbf75a3c
--- /dev/null
+++ b/hyracks-fullstack/hyracks/hyracks-api/src/main/java/org/apache/hyracks/api/util/Lazy.java
@@ -0,0 +1,43 @@
+/*
+ * 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.hyracks.api.util;
+
+import java.util.concurrent.FutureTask;
+import java.util.function.Supplier;
+
+/**
+ * A thread-safe lazy initializer.
+ * @param <T>
+ */
+public class Lazy<T> {
+    private final FutureTask<T> task;
+
+    public Lazy(Supplier<T> supplier) {
+        this.task = new FutureTask<>(supplier::get);
+    }
+
+    public T get() {
+        task.run(); // idempotent
+        try {
+            return task.get();
+        } catch (Exception e) {
+            throw new RuntimeException("Lazy initialization failed", e);
+        }
+    }
+}