Getting Started

Installation

1. Install the Deephaven library and the packages it depends on. Instructions for doing so are in the Deephaven repo in cpp-client/README.md.

2. Confirm that you are able to build and run the “Hello, World” example program provided in the Deephaven Examples repo in the directory hello_world

3. The file hello_world/CMakeLists.txt shows how to use CMake to build your project with the Deephaven Client library. You can use this as a starting point for your own projects.

Hello, World

Deephaven client programs typically follow this recipe:

1. Connect to the server with Client::connect providing the server hostname and port.

2. Call Client.getManager to get a TableHandleManager.

3. Use that TableHandleManager to create, access, or modify tables in the system.

4. Clean up resources automatically when the variables exit their scopes.

This is the “Hello, World” example from the file hello_world/main.cc.

#include <iostream>
#include "deephaven/client/highlevel/client.h"

using deephaven::client::Client;

int main() {
  const char *server = "localhost:10000";
  auto client = Client::connect(server);
  auto manager = client.getManager();
  auto table = manager.emptyTable(10);
  auto t2 = table.update("ABC = ii + 100");
  std::cout << t2.stream(true) << '\n';

  return 0;
}

This is the corresponding CMakeLists.txt:

cmake_minimum_required(VERSION 3.16)
project(hello_world)

set(CMAKE_CXX_STANDARD 17)

find_package(deephaven REQUIRED)

find_package(absl REQUIRED)
find_package(Arrow REQUIRED)
find_package(ArrowFlight REQUIRED HINTS ${Arrow_DIR})
find_package(Protobuf REQUIRED)
find_package(gRPC REQUIRED)
find_package(Threads REQUIRED)

add_executable(hello_world main.cc)

target_link_libraries(hello_world deephaven::client)

To build and run the example, type

cd cpp_examples/hello_world
mkdir build && cd build
cmake ..
make -j8
./hello_world