[refactor] Clean unused codes in Lock

paimon-core/src/main/java/org/apache/paimon/AbstractFileStore.java

@@ -267,8 +267,7 @@ public FileStoreCommitImpl newCommit(String commitUser, List<CommitCallback> cal
         SnapshotManager snapshotManager = snapshotManager();
         SnapshotCommit snapshotCommit = catalogEnvironment.snapshotCommit(snapshotManager);
         if (snapshotCommit == null) {
-            snapshotCommit =
-                    new RenamingSnapshotCommit(snapshotManager, Lock.emptyFactory().create());
+            snapshotCommit = new RenamingSnapshotCommit(snapshotManager, Lock.empty());
         }
         return new FileStoreCommitImpl(
                 snapshotCommit,

paimon-core/src/main/java/org/apache/paimon/catalog/FileSystemCatalog.java

@@ -134,7 +134,7 @@ public <T> T runWithLock(Identifier identifier, Callable<T> callable) throws Exc
                 lockFactory
                         .map(factory -> factory.createLock(lockContext().orElse(null)))
                         .map(l -> Lock.fromCatalog(l, identifier))
-                        .orElseGet(() -> Lock.emptyFactory().create())) {
+                        .orElseGet(Lock::empty)) {
             return lock.runWithLock(callable);
         }
     }

paimon-core/src/main/java/org/apache/paimon/catalog/RenamingSnapshotCommit.java

@@ -99,7 +99,7 @@ public SnapshotCommit create(Identifier identifier, SnapshotManager snapshotMana
                     Optional.ofNullable(lockFactory)
                             .map(factory -> factory.createLock(lockContext))
                             .map(l -> Lock.fromCatalog(l, identifier))
-                            .orElseGet(() -> Lock.emptyFactory().create());
+                            .orElseGet(Lock::empty);
             return new RenamingSnapshotCommit(snapshotManager, lock);
         }
 

paimon-core/src/main/java/org/apache/paimon/operation/Lock.java

@@ -20,13 +20,8 @@
 
 import org.apache.paimon.annotation.Public;
 import org.apache.paimon.catalog.CatalogLock;
-import org.apache.paimon.catalog.CatalogLockContext;
-import org.apache.paimon.catalog.CatalogLockFactory;
 import org.apache.paimon.catalog.Identifier;
 
-import javax.annotation.Nullable;
-
-import java.io.Serializable;
 import java.util.concurrent.Callable;
 
 /**
@@ -40,57 +35,8 @@ public interface Lock extends AutoCloseable {
     /** Run with lock. */
     <T> T runWithLock(Callable<T> callable) throws Exception;
 
-    /** A factory to create {@link Lock}. */
-    interface Factory extends Serializable {
-        Lock create();
-    }
-
-    static Factory factory(
-            @Nullable CatalogLockFactory lockFactory,
-            @Nullable CatalogLockContext lockContext,
-            Identifier tablePath) {
-        return lockFactory == null
-                ? new EmptyFactory()
-                : new LockFactory(lockFactory, lockContext, tablePath);
-    }
-
-    static Factory emptyFactory() {
-        return new EmptyFactory();
-    }
-
-    /** A {@link Factory} creating lock from catalog. */
-    class LockFactory implements Factory {
-
-        private static final long serialVersionUID = 1L;
-
-        private final CatalogLockFactory lockFactory;
-        private final CatalogLockContext lockContext;
-        private final Identifier tablePath;
-
-        public LockFactory(
-                CatalogLockFactory lockFactory,
-                CatalogLockContext lockContext,
-                Identifier tablePath) {
-            this.lockFactory = lockFactory;
-            this.lockContext = lockContext;
-            this.tablePath = tablePath;
-        }
-
-        @Override
-        public Lock create() {
-            return fromCatalog(lockFactory.createLock(lockContext), tablePath);
-        }
-    }
-
-    /** A {@link Factory} creating empty lock. */
-    class EmptyFactory implements Factory {
-
-        private static final long serialVersionUID = 1L;
-
-        @Override
-        public Lock create() {
-            return new EmptyLock();
-        }
+    static Lock empty() {
+        return new EmptyLock();
     }
 
     /** An empty lock. */

paimon-core/src/test/java/org/apache/paimon/rest/RESTCatalogServer.java

@@ -318,7 +318,7 @@ private static MockResponse commitTableApiHandler(
         FileStoreTable table =
                 (FileStoreTable) catalog.getTable(Identifier.create(databaseName, tableName));
         RenamingSnapshotCommit commit =
-                new RenamingSnapshotCommit(table.snapshotManager(), Lock.emptyFactory().create());
+                new RenamingSnapshotCommit(table.snapshotManager(), Lock.empty());
         String branchName = requestBody.getIdentifier().getBranchName();
         if (branchName == null) {
             branchName = "main";