stevenzwu commented on code in PR #10484:
URL: https://github.com/apache/iceberg/pull/10484#discussion_r1726213077


##########
flink/v1.19/flink/src/test/java/org/apache/iceberg/flink/maintenance/operator/TestLockFactoryBase.java:
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@@ -0,0 +1,80 @@
+/*
+ * 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.iceberg.flink.maintenance.operator;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.IOException;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+abstract class TestLockFactoryBase {
+  protected TriggerLockFactory lockFactory;
+
+  abstract TriggerLockFactory lockFactory();
+
+  @BeforeEach
+  void before() {
+    this.lockFactory = lockFactory();
+    lockFactory.open();
+  }
+
+  @AfterEach
+  void after() throws IOException {
+    lockFactory.close();
+  }
+
+  @Test
+  void testTryLock() {
+    TriggerLockFactory.Lock lock1 = lockFactory.createLock();
+    TriggerLockFactory.Lock lock2 = lockFactory.createLock();
+    assertThat(lock1.tryLock()).isTrue();
+    assertThat(lock1.tryLock()).isFalse();
+    assertThat(lock2.tryLock()).isFalse();
+  }
+
+  @Test
+  void testUnLock() {
+    TriggerLockFactory.Lock lock = lockFactory.createLock();
+    assertThat(lock.tryLock()).isTrue();
+
+    lock.unlock();
+    assertThat(lock.tryLock()).isTrue();
+  }
+
+  @Test
+  void testNoConflict() {
+    TriggerLockFactory.Lock lock1 = lockFactory.createLock();
+    TriggerLockFactory.Lock lock2 = lockFactory.createRecoveryLock();
+    assertThat(lock1.tryLock()).isTrue();
+    assertThat(lock2.tryLock()).isTrue();
+  }
+
+  @Test
+  void testDoubleUnLock() {
+    TriggerLockFactory.Lock lock = lockFactory.createLock();
+    assertThat(lock.tryLock()).isTrue();
+
+    lock.unlock();
+    lock.unlock();

Review Comment:
   unlock can return false when the lock doesn't exist. then here we can assert 
that 1st unlock should return true and 2nd unlock should return false.
   
   similar to the `LockManager` interface from api module.
   ```
     /**
      * Release a lock
      *
      * <p>exception must not be thrown for this method.
      *
      * @param entityId ID of the entity to lock
      * @param ownerId ID of the owner if the lock
      * @return if the owner held the lock and successfully released it.
      */
     boolean release(String entityId, String ownerId);
   ```



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