All the Pieces at Once

1#include <iostream>
2#include <stdexcept>
3#include <string>
4 
5class JobError : public std::runtime_error {
6public:
7    explicit JobError(const std::string& m) : std::runtime_error(m) {}
8};
9 
10class RetryableError : public JobError {
11public:
12    explicit RetryableError(const std::string& m) : JobError(m) {}
13};
14 
15class Lock {
16public:
17    Lock() { std::cout << "lock\n"; }
18    ~Lock() { std::cout << "unlock\n"; }
19};
20 
21void runJob(int id) {
22    Lock lock;
23    std::cout << "job " << id << "\n";
24    if (id == 2) {
25        throw RetryableError("busy");
26    }
27    if (id == 3) {
28        throw JobError("corrupt");
29    }
30}
31 
32void runWithLog(int id) {
33    try {
34        runJob(id);
35    } catch (const JobError& e) {
36        std::cout << "log: " << e.what() << "\n";
37        throw;
38    }
39}
40 
41int main() {
42    for (int id = 1; id <= 3; id++) {
43        try {
44            runWithLog(id);
45            std::cout << "job " << id << " ok\n";
46        } catch (const RetryableError& e) {
47            std::cout << "retry later: " << e.what() << "\n";
48        } catch (const JobError& e) {
49            std::cout << "abandon: " << e.what() << "\n";
50        }
51    }
52    return 0;
53}