feat: support triple grpc heart beat

core/api/src/main/java/com/alipay/sofa/rpc/common/RpcOptions.java

@@ -419,6 +419,7 @@ public class RpcOptions {
      * 默认 grpc maxInboundMessageSize大小
      */
     public static final String TRANSPORT_GRPC_MAX_INBOUND_MESSAGE_SIZE  = "transport.grpc.maxInboundMessageSize";
+
     /**
      * 最大IO的buffer大小
      */

core/common/src/main/java/com/alipay/sofa/rpc/common/config/RpcConfigKeys.java

@@ -140,4 +140,16 @@ public class RpcConfigKeys {
                                                                                         false,
                                                                                         "specify biz thread pool implementation type",
                                                                                         new String[] { "sofa_rpc_server_thread_pool_type" });
+
+    /**
+     * grpc client keep alive interval
+     */
+    public static ConfigKey<Integer>        TRIPLE_CLIENT_KEEP_ALIVE_INTERVAL   = ConfigKey
+                                                                                    .build(
+                                                                                        "sofa.rpc.triple.client.keepAlive.interval",
+                                                                                        0,
+                                                                                        false,
+                                                                                        "keep alive interval in second for triple client",
+                                                                                        new String[] { "sofa_rpc_triple_client_keepAlive_interval" });
+
 }

core/common/src/main/resources/com/alipay/sofa/rpc/common/rpc-config-default.json

@@ -273,6 +273,8 @@ PS:大家也看到了，本JSON文档是支持注释的，而标准JSON是不支
   "compress.size.baseline": 2048,
   //Whether the Http2 Cleartext protocol client uses Prior Knowledge to start Http2
   "transport.client.h2c.usePriorKnowledge": true,
+  // grpc client keep alive interval, default to 0, no keep alive
+  "sofa.rpc.triple.client.keepAlive.interval": 0,
   /*-------------Transport层相关配置结束-------------*/
 
   /*

remoting/remoting-triple/src/main/java/com/alipay/sofa/rpc/transport/triple/TripleClientTransport.java

@@ -16,9 +16,11 @@
  */
 package com.alipay.sofa.rpc.transport.triple;
 
+import com.alipay.sofa.common.config.SofaConfigs;
 import com.alipay.sofa.rpc.client.ProviderInfo;
 import com.alipay.sofa.rpc.common.RpcConfigs;
 import com.alipay.sofa.rpc.common.RpcOptions;
+import com.alipay.sofa.rpc.common.config.RpcConfigKeys;
 import com.alipay.sofa.rpc.common.utils.NetUtils;
 import com.alipay.sofa.rpc.context.RpcInternalContext;
 import com.alipay.sofa.rpc.context.RpcInvokeContext;
@@ -78,6 +80,10 @@ public class TripleClientTransport extends ClientTransport {
 
     protected final Object lock = new Object();
 
+    protected static int KEEP_ALIVE_INTERVAL = SofaConfigs.getOrCustomDefault(
+                                                    RpcConfigKeys.TRIPLE_CLIENT_KEEP_ALIVE_INTERVAL,
+                                                    RpcConfigs.getIntValue(RpcConfigKeys.TRIPLE_CLIENT_KEEP_ALIVE_INTERVAL.getKey()));
+
     /**
      * The constructor
      *
@@ -278,6 +284,12 @@ private ManagedChannel initChannel(ProviderInfo url) {
         builder.disableRetry();
         builder.intercept(clientHeaderClientInterceptor);
         builder.maxInboundMessageSize(RpcConfigs.getIntValue(RpcOptions.TRANSPORT_GRPC_MAX_INBOUND_MESSAGE_SIZE));
+
+        if (KEEP_ALIVE_INTERVAL > 0) {
+            builder.keepAliveWithoutCalls(true);
+            builder.keepAliveTime(KEEP_ALIVE_INTERVAL, TimeUnit.SECONDS);
+        }
+
         return builder.build();
     }
 

remoting/remoting-triple/src/test/java/com/alipay/sofa/rpc/transport/triple/TripleClientTransportTest.java

@@ -0,0 +1,35 @@
+/*
+ * 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 com.alipay.sofa.rpc.transport.triple;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ *
+ * @author junyuan
+ * @version TripleClientTransportTest.java, v 0.1 2024-08-01 17:12 junyuan Exp $
+ */
+public class TripleClientTransportTest {
+
+    @Test
+    public void testInit() {
+
+        Assert.assertEquals(TripleClientTransport.KEEP_ALIVE_INTERVAL, 0);
+
+    }
+}