support nacos config annotation (#3857)

Author: shiyiyue1102

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/NacosConfigAutoConfiguration.java

@@ -16,6 +16,7 @@
 
 package com.alibaba.cloud.nacos;
 
+import com.alibaba.cloud.nacos.annotation.NacosAnnotationProcessor;
 import com.alibaba.cloud.nacos.refresh.NacosContextRefresher;
 import com.alibaba.cloud.nacos.refresh.NacosRefreshHistory;
 import com.alibaba.cloud.nacos.refresh.SmartConfigurationPropertiesRebinder;
@@ -63,8 +64,12 @@ public NacosConfigManager nacosConfigManager(
 	}
 
 	@Bean
-	public NacosContextRefresher nacosContextRefresher(
-			NacosConfigManager nacosConfigManager,
+	public NacosAnnotationProcessor nacosAnnotationProcessor() {
+		return new NacosAnnotationProcessor();
+	}
+
+	@Bean
+	public NacosContextRefresher nacosContextRefresher(NacosConfigManager nacosConfigManager,
 			NacosRefreshHistory nacosRefreshHistory) {
 		// Consider that it is not necessary to be compatible with the previous
 		// configuration

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/annotation/AbstractConfigChangeListener.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2013-2023 the original author or 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
+ *
+ *      https://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 com.alibaba.cloud.nacos.annotation;
+
+import java.util.Map;
+
+import com.alibaba.nacos.api.config.ConfigChangeEvent;
+import com.alibaba.nacos.api.config.ConfigChangeItem;
+import com.alibaba.nacos.api.config.listener.AbstractSharedListener;
+import com.alibaba.nacos.client.config.impl.ConfigChangeHandler;
+
+public abstract class AbstractConfigChangeListener extends AbstractSharedListener implements TargetRefreshable {
+
+	String lastContent;
+
+	Object target;
+
+	@Override
+	public Object getTarget() {
+		return target;
+	}
+
+	@Override
+	public void setTarget(Object target) {
+		this.target = target;
+	}
+
+	public AbstractConfigChangeListener(Object target) {
+		this.target = target;
+	}
+
+	protected void setLastContent(String lastContent) {
+		this.lastContent = lastContent;
+	}
+
+	@Override
+	public void innerReceive(String dataId, String group, String configInfo) {
+
+		Map<String, ConfigChangeItem> data = null;
+		try {
+			data = ConfigChangeHandler.getInstance().parseChangeData(lastContent, configInfo, type(dataId));
+		}
+		catch (Exception e) {
+			throw new RuntimeException(e);
+		}
+		ConfigChangeEvent event = new ConfigChangeEvent(data);
+		receiveConfigChange(event);
+		lastContent = configInfo;
+	}
+
+	private String type(String dataId) {
+		if (dataId.endsWith(".yml") || dataId.endsWith(".yaml")) {
+			return "yaml";
+		}
+		return "properties";
+	}
+
+	abstract void receiveConfigChange(ConfigChangeEvent event);
+}

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/annotation/CustomDateDeserializer.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2013-2023 the original author or 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
+ *
+ *      https://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 com.alibaba.cloud.nacos.annotation;
+
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonNode;
+
+public class CustomDateDeserializer extends JsonDeserializer<Date> {
+
+	private static final long serialVersionUID = 1L;
+
+	private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+
+	public CustomDateDeserializer() {
+		super();
+	}
+
+	@Override
+	public Date deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
+		JsonNode node = jsonParser.getCodec().readTree(jsonParser);
+		String date = node.textValue();
+		try {
+			return dateFormat.parse(date);
+		}
+		catch (Exception e) {
+			throw new IOException("Invalid date format");
+		}
+	}
+}

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/annotation/JsonUtils.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2013-2023 the original author or 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
+ *
+ *      https://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 com.alibaba.cloud.nacos.annotation;
+
+import java.io.IOException;
+import java.lang.reflect.Type;
+
+import com.alibaba.nacos.api.exception.runtime.NacosDeserializationException;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.type.TypeFactory;
+
+final class JsonUtils {
+
+	private JsonUtils() {
+	}
+
+	static ObjectMapper mapper = new ObjectMapper();
+
+	static {
+		mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
+		mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
+	}
+
+	/**
+	 * Json string deserialize to Object.
+	 *
+	 * @param json json string
+	 * @param cls  class of object
+	 * @param <T>  General type
+	 * @return object
+	 * @throws NacosDeserializationException if deserialize failed
+	 */
+	public static <T> T toObj(String json, Class<T> cls) {
+		try {
+			return mapper.readValue(json, cls);
+		}
+		catch (IOException e) {
+			throw new NacosDeserializationException(cls, e);
+		}
+	}
+
+	public static <T> T toObj(String json, Type type) {
+		try {
+			return mapper.readValue(json, TypeFactory.defaultInstance().constructType(type));
+		}
+		catch (IOException e) {
+			throw new NacosDeserializationException(type, e);
+		}
+	}
+}