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Kubernetes Service Discovery for Hazelcast Discovery SPI

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/*
 * Copyright (c) 2008-2019, 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.
 */

package com.hazelcast.internal.management.dto;

import com.hazelcast.internal.jmx.NetworkingServiceMBean;
import com.hazelcast.internal.json.JsonObject;
import com.hazelcast.internal.management.JsonSerializable;
import com.hazelcast.nio.AggregateEndpointManager;
import com.hazelcast.nio.EndpointManager;
import com.hazelcast.nio.NetworkingService;

import static com.hazelcast.instance.EndpointQualifier.CLIENT;
import static com.hazelcast.util.JsonUtil.getInt;

/**
 * A Serializable DTO for {@link NetworkingServiceMBean}.
 */
public class ConnectionManagerDTO implements JsonSerializable {

    public int clientConnectionCount;
    public int activeConnectionCount;
    public int connectionCount;

    public ConnectionManagerDTO() {
    }

    public ConnectionManagerDTO(NetworkingService ns) {
        AggregateEndpointManager aggregate = ns.getAggregateEndpointManager();
        EndpointManager cem = ns.getEndpointManager(CLIENT);
        this.clientConnectionCount = cem != null ? cem.getActiveConnections().size() : -1;
        this.activeConnectionCount = aggregate.getActiveConnections().size();
        this.connectionCount = aggregate.getConnections().size();
    }

    @Override
    public JsonObject toJson() {
        final JsonObject root = new JsonObject();
        root.add("clientConnectionCount", clientConnectionCount);
        root.add("activeConnectionCount", activeConnectionCount);
        root.add("connectionCount", connectionCount);
        return root;
    }

    @Override
    public void fromJson(JsonObject json) {
        clientConnectionCount = getInt(json, "clientConnectionCount", -1);
        activeConnectionCount = getInt(json, "activeConnectionCount", -1);
        connectionCount = getInt(json, "connectionCount", -1);
    }
}