[iotdb] 02/02: Add a DevicePath cache to avoid init duplicated partial paths

[ha...@apache.org]

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haonan pushed a commit to branch devicePathCache
in repository https://gitbox.apache.org/repos/asf/iotdb.git

commit c0216c71ec543929f514641a081834ba296f912d
Author: HTHou <hh...@outlook.com>
AuthorDate: Wed Apr 19 10:35:42 2023 +0800

    Add a DevicePath cache to avoid init duplicated partial paths
---
 .../db/metadata/cache/DataNodeDevicePathCache.java | 65 ++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/server/src/main/java/org/apache/iotdb/db/metadata/cache/DataNodeDevicePathCache.java b/server/src/main/java/org/apache/iotdb/db/metadata/cache/DataNodeDevicePathCache.java
new file mode 100644
index 0000000000..0649c27b5b
--- /dev/null
+++ b/server/src/main/java/org/apache/iotdb/db/metadata/cache/DataNodeDevicePathCache.java
@@ -0,0 +1,65 @@
+/*
+ * 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.iotdb.db.metadata.cache;
+
+import org.apache.iotdb.commons.exception.IllegalPathException;
+import org.apache.iotdb.commons.path.PartialPath;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/** This class is for reducing duplicated Device PartialPath splits in write process. */
+public class DataNodeDevicePathCache {
+
+  private final Map<String, PartialPath> devicePathCache;
+
+  private DataNodeDevicePathCache() {
+    devicePathCache = new ConcurrentHashMap<>();
+  }
+
+  public static DataNodeDevicePathCache getInstance() {
+    return DataNodeDevicePathCache.DataNodeDevicePathCacheHolder.INSTANCE;
+  }
+
+  /** singleton pattern. */
+  private static class DataNodeDevicePathCacheHolder {
+    private static final DataNodeDevicePathCache INSTANCE = new DataNodeDevicePathCache();
+  }
+
+  public PartialPath get(String deviceId) throws IllegalPathException {
+    try {
+      return devicePathCache.computeIfAbsent(
+          deviceId,
+          path -> {
+            try {
+              return new PartialPath(deviceId);
+            } catch (IllegalPathException e) {
+              throw new IllegalArgumentException(e);
+            }
+          });
+    } catch (IllegalArgumentException e) {
+      throw new IllegalPathException(deviceId);
+    }
+  }
+
+  public void cleanUp() {
+    devicePathCache.clear();
+  }
+}