added service files

application/src/main/java/org/thingsboard/server/service/cf/ctx/CalculatedFieldStateService.java

@@ -0,0 +1,30 @@
+/**
+ * Copyright © 2016-2024 The Thingsboard Authors
+ *
+ * Licensed 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.thingsboard.server.service.cf.ctx;
+
+import java.util.Map;
+
+public interface CalculatedFieldStateService {
+
+    Map<CalculatedFieldEntityCtxId, CalculatedFieldEntityCtx> restoreStates();
+
+    CalculatedFieldEntityCtx restoreState(CalculatedFieldEntityCtxId ctxId);
+
+    void persistState(CalculatedFieldEntityCtxId ctxId, CalculatedFieldEntityCtx state);
+
+    void removeState(CalculatedFieldEntityCtxId ctxId);
+
+}

application/src/main/java/org/thingsboard/server/service/cf/ctx/state/RocksDBStateService.java

@@ -0,0 +1,64 @@
+/**
+ * Copyright © 2016-2024 The Thingsboard Authors
+ *
+ * Licensed 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.thingsboard.server.service.cf.ctx.state;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
+import org.springframework.stereotype.Service;
+import org.thingsboard.common.util.JacksonUtil;
+import org.thingsboard.server.service.cf.RocksDBService;
+import org.thingsboard.server.service.cf.ctx.CalculatedFieldEntityCtx;
+import org.thingsboard.server.service.cf.ctx.CalculatedFieldEntityCtxId;
+import org.thingsboard.server.service.cf.ctx.CalculatedFieldStateService;
+
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+@Service
+@RequiredArgsConstructor
+@ConditionalOnExpression("'${service.type:null}'=='monolith'")
+public class RocksDBStateService implements CalculatedFieldStateService {
+
+    private final RocksDBService rocksDBService;
+
+    @Override
+    public Map<CalculatedFieldEntityCtxId, CalculatedFieldEntityCtx> restoreStates() {
+        return rocksDBService.getAll().entrySet().stream()
+                .collect(Collectors.toMap(
+                        entry -> JacksonUtil.fromString(entry.getKey(), CalculatedFieldEntityCtxId.class),
+                        entry -> JacksonUtil.fromString(entry.getValue(), CalculatedFieldEntityCtx.class)
+                ));
+    }
+
+    @Override
+    public CalculatedFieldEntityCtx restoreState(CalculatedFieldEntityCtxId ctxId) {
+        return Optional.ofNullable(rocksDBService.get(JacksonUtil.writeValueAsString(ctxId)))
+                .map(storedState -> JacksonUtil.fromString(storedState, CalculatedFieldEntityCtx.class))
+                .orElse(null);
+    }
+
+    @Override
+    public void persistState(CalculatedFieldEntityCtxId ctxId, CalculatedFieldEntityCtx state) {
+        rocksDBService.put(JacksonUtil.writeValueAsString(ctxId), JacksonUtil.writeValueAsString(state));
+    }
+
+    @Override
+    public void removeState(CalculatedFieldEntityCtxId ctxId) {
+        rocksDBService.delete(JacksonUtil.writeValueAsString(ctxId));
+    }
+
+}