Move ServerNode into separate file

src/brpc/server_node.h

+// Copyright (c) 2014 Baidu, Inc.
+// 
+// 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.
+//
+// Authors: Ge,Jun (gejun@baidu.com)
+
+#ifndef BRPC_SERVER_NODE_H
+#define BRPC_SERVER_NODE_H
+
+#include <string>
+#include "butil/endpoint.h"
+
+namespace brpc {
+
+// Representing a server inside a NamingService.
+struct ServerNode {
+    ServerNode() {}
+    
+    explicit ServerNode(const butil::EndPoint& pt) : addr(pt) {}
+
+    ServerNode(butil::ip_t ip, int port, const std::string& tag2)
+        : addr(ip, port), tag(tag2) {}
+
+    ServerNode(const butil::EndPoint& pt, const std::string& tag2)
+        : addr(pt), tag(tag2) {}
+
+    ServerNode(butil::ip_t ip, int port) : addr(ip, port) {}
+
+    butil::EndPoint addr;
+    std::string tag;
+};
+
+inline bool operator<(const ServerNode& n1, const ServerNode& n2)
+{ return n1.addr != n2.addr ? (n1.addr < n2.addr) : (n1.tag < n2.tag); }
+
+inline bool operator==(const ServerNode& n1, const ServerNode& n2)
+{ return n1.addr == n2.addr && n1.tag == n2.tag; }
+
+inline bool operator!=(const ServerNode& n1, const ServerNode& n2)
+{ return !(n1 == n2); }
+
+inline std::ostream& operator<<(std::ostream& os, const ServerNode& n) {
+    os << n.addr;
+    if (!n.tag.empty()) {
+        os << "(tag=" << n.tag << ')';
+    }
+    return os;
+}
+
+} // namespace brpc
+
+#endif  // BRPC_SERVER_NODE_H