StartAsync.cpp

/*
 * Copyright (c) 2008-2023, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include <chrono>
#include <future>

#include <hazelcast/client/hazelcast_client.h>
#include <hazelcast/client/lifecycle_listener.h>
#include <hazelcast/client/lifecycle_event.h>

int
main()
{
    hazelcast::client::client_config config;

    /**
     * Set true for non blocking {@link hazelcast_client(const client_config
     * &)}. The client creation won't wait to connect to cluster. The client
     * instace will throw exception until it connects to cluster and become
     * ready. If set to false, {@link hazelcast_client(const client_config &)}
     * will block until a cluster connection established and it's ready to use
     * client instance.
     *
     * default value is false
     */
    config.get_connection_strategy_config().set_async_start(true);

    // Add a lifecycle listener so that we can track when the client is
    // connected
    std::promise<void> connected;
    config.add_listener(hazelcast::client::lifecycle_listener().on_connected(
      [&connected]() { connected.set_value(); }));

    auto hz = hazelcast::new_client(std::move(config)).get();

    auto connection_future = connected.get_future();
    if (connection_future.wait_for(std::chrono::seconds(0)) !=
        std::future_status::ready) {
        std::cout << "Async client is not connected yet." << std::endl;
    }

    // the client may not have connected to the cluster yet at this point since
    // the cluster connection is async!!!
    connection_future.wait();

    std::cout << "Async client is connected now." << std::endl;

    std::cout << "Finished" << std::endl;

    hz.shutdown().get();

    return 0;
}