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48 lines
814 B
C++
48 lines
814 B
C++
#pragma once
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#include <zkutil/ZooKeeper.h>
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namespace zkutil
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{
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class Increment
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{
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public:
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Increment(ZooKeeperPtr zk_, const std::string & path_)
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: zk(zk_), path(path_)
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{
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zk->createAncestors(path);
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}
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size_t get()
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{
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LOG_TRACE(log, "Get increment");
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size_t result = 0;
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std::string result_str;
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zkutil::Stat stat;
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bool success = false;
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do
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{
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if (zk->tryGet(path, result_str, &stat))
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{
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result = std::stol(result_str) + 1;
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success = zk->trySet(path, std::to_string(result), stat.version) == ZOK;
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}
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else
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{
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success = zk->tryCreate(path, std::to_string(result), zkutil::CreateMode::Persistent) == ZOK;
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}
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}
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while(!success);
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return result;
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}
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private:
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zkutil::ZooKeeperPtr zk;
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std::string path;
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Logger * log = &Logger::get("zkutil::Increment");
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};
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} |