hhuang1231 commented on code in PR #4599:
URL: https://github.com/apache/eventmesh/pull/4599#discussion_r1413380269


##########
eventmesh-connectors/eventmesh-connector-lark/src/main/java/org/apache/eventmesh/connector/lark/sink/connector/LarkSinkConnector.java:
##########
@@ -0,0 +1,143 @@
+/*
+ * 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.eventmesh.connector.lark.sink.connector;
+
+import static org.apache.eventmesh.connector.lark.sink.ImServiceHandler.create;
+
+import org.apache.eventmesh.connector.lark.sink.ImServiceHandler;
+import org.apache.eventmesh.connector.lark.sink.config.LarkSinkConfig;
+import org.apache.eventmesh.connector.lark.sink.config.SinkConnectorConfig;
+import org.apache.eventmesh.openconnect.api.config.Config;
+import org.apache.eventmesh.openconnect.api.connector.ConnectorContext;
+import org.apache.eventmesh.openconnect.api.connector.SinkConnectorContext;
+import org.apache.eventmesh.openconnect.api.sink.Sink;
+import org.apache.eventmesh.openconnect.offsetmgmt.api.data.ConnectRecord;
+
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import com.github.rholder.retry.RetryException;
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import com.lark.oapi.Client;
+import com.lark.oapi.core.enums.AppType;
+import com.lark.oapi.core.request.SelfBuiltTenantAccessTokenReq;
+import com.lark.oapi.core.response.TenantAccessTokenResp;
+
+import lombok.SneakyThrows;
+import lombok.extern.slf4j.Slf4j;
+
+
+@Slf4j
+public class LarkSinkConnector implements Sink {
+
+    public static final String TENANT_ACCESS_TOKEN = "tenant_access_token";
+
+    /**
+     * replace lark build-in tokenCache
+     */
+    public static final Cache<String, String> AUTH_CACHE = 
CacheBuilder.newBuilder()
+            .initialCapacity(12)
+            .maximumSize(10)
+            .concurrencyLevel(5)
+            .expireAfterWrite(30, TimeUnit.MINUTES)
+            .build();
+
+    private LarkSinkConfig sinkConfig;
+
+    private ImServiceHandler imServiceHandler;
+
+    private final AtomicBoolean started = new AtomicBoolean(false);
+
+    @Override
+    public Class<? extends Config> configClass() {
+        return LarkSinkConfig.class;
+    }
+
+    @Override
+    public void init(Config config) {
+        // Deprecated
+    }
+
+    @Override
+    public void init(ConnectorContext connectorContext) {
+        // init config for lark sink connector
+        SinkConnectorContext sinkConnectorContext = (SinkConnectorContext) 
connectorContext;
+        this.sinkConfig = (LarkSinkConfig) 
sinkConnectorContext.getSinkConfig();
+
+        SinkConnectorConfig sinkConnectorConfig = 
sinkConfig.getSinkConnectorConfig();
+        sinkConnectorConfig.validateSinkConfiguration();
+
+        imServiceHandler = create(sinkConnectorConfig);
+    }
+
+    @Override
+    public void start() {
+        if (!started.compareAndSet(false, true)) {
+            log.info("LarkSinkConnector has been started.");
+        }
+    }
+
+    @Override
+    public void commit(ConnectRecord record) {
+        // Sink does not need to implement
+    }
+
+    @Override
+    public String name() {
+        return this.sinkConfig.getSinkConnectorConfig().getConnectorName();
+    }
+
+    @Override
+    public void stop() {
+        if (!started.compareAndSet(true, false)) {
+            log.info("LarkSinkConnector has not started yet.");
+        }
+    }
+
+    @Override
+    public void put(List<ConnectRecord> sinkRecords) {
+        for (ConnectRecord connectRecord : sinkRecords) {
+            try {
+                imServiceHandler.sink(connectRecord);
+            } catch (ExecutionException | RetryException e) {
+                log.error("Failed to sink event to lark", e);
+            }
+        }
+    }
+
+    @SneakyThrows
+    public static String getTenantAccessToken(String appId, String appSecret) {

Review Comment:
   For the management of access credentials, I actually plan to make it a 
global configuration. Other services may also need to use the credentials 
management . If you put ImServiceHandler in, it feels like it is only serving 
ImServiceHandler. But it's also possible that I'm over-designing it.
   (Actually, there is one point that puzzles me. If there is only one access 
credential, why use the Cache collection?)
   
   ---
   
对于访问凭证的管理,我其实打算做成一个全局配置,其他服务可能也会需要用到凭证管理。如果放进ImServiceHandler,感觉似乎只是为了ImServiceHandler而服务。不过我也有可能过度设计了。
   
   (其实也有一个点令我疑惑,如果访问凭证只有一种,何必使用Cache集合呢?)



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