apache--brpc
wehub-resource-sync
76 行
2.9 KiB
C++
76 行
2.9 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include <gflags/gflags.h>
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#include "butil/logging.h"
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#include "bthread/bthread.h"
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#include "brpc/log.h"
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#include "brpc/reloadable_flags.h"
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#include "brpc/periodic_naming_service.h"
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namespace brpc {
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DEFINE_int32(ns_access_interval, 5,
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"Wait so many seconds before next access to naming service");
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BRPC_VALIDATE_GFLAG(ns_access_interval, PositiveInteger);
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int PeriodicNamingService::GetNamingServiceAccessIntervalMs() const {
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return std::max(FLAGS_ns_access_interval, 1) * 1000;
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}
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int PeriodicNamingService::RunNamingService(
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const char* service_name, NamingServiceActions* actions) {
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std::vector<ServerNode> servers;
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bool ever_reset = false;
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while (true) {
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servers.clear();
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const int rc = GetServers(service_name, &servers);
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if (rc == 0) {
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ever_reset = true;
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actions->ResetServers(servers);
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} else if (!ever_reset) {
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// ResetServers must be called at first time even if GetServers
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// failed, to wake up callers to `WaitForFirstBatchOfServers'
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ever_reset = true;
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servers.clear();
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actions->ResetServers(servers);
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}
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// If `bthread_stop' is called to stop the ns bthread when `brpc::Join‘ is called
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// in `GetServers' to wait for a rpc to complete. The bthread will be woken up,
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// reset `TaskMeta::interrupted' and continue to join the rpc. After the rpc is complete,
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// `bthread_usleep' will not sense the interrupt signal and sleep successfully.
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// Finally, the ns bthread will never exit. So need to check the stop status of
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// the bthread here and exit the bthread in time.
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if (bthread_stopped(bthread_self())) {
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RPC_VLOG << "Quit NamingServiceThread=" << bthread_self();
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return 0;
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}
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if (bthread_usleep(GetNamingServiceAccessIntervalMs() * 1000UL) < 0) {
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if (errno == ESTOP) {
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RPC_VLOG << "Quit NamingServiceThread=" << bthread_self();
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return 0;
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}
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PLOG(FATAL) << "Fail to sleep";
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return -1;
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}
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}
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}
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} // namespace brpc
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