Github user littletiny commented on the pull request:
https://github.com/apache/thrift/pull/315#issuecomment-66949477
the c++ version in directory contrib/zeromq override wrong interface
in TZmqClient.h
TZmqClient inherit from TTransport
TTransport provide these method:
// these two methods is not virtual !
read
write
// these tow methods is virtual
read_virt
write_virt
But in TZmqClient.h
we can see
TZmqClient override read and write methods
in test-client.cpp:
use TBinaryProtocol as the protocol
···
zmq::context_t ctx(1);
shared_ptr<TZmqClient> transport(new TZmqClient(ctx, endpoint, socktype));
shared_ptr<TBinaryProtocol> protocol(new TBinaryProtocol(transport));
StorageClient client(protocol);
transport->open();
if (incr) {
client.incr(incr);
usleep(50000);
} else {
int value = client.get();
std::cout << value << std::endl;
}
···
now client is a StorageClient object
client.incr callgraph :
StorageClient::incr-> StorageClient::send_incr ->
TBinaryProtocol::WriteMessageBegin -> TBinaryProtocol::writeI32 ->
TTransport::write
but TTransport::write is not a virtual method, it call
TTransport::write_virt, this is the real virtual methods
in class TZmqClient, we override it cannot take effect
we need to override TTransport::write_virt
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