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Kubernetes Service Discovery for Hazelcast Discovery SPI
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/*
 * Copyright (c) 2008-2020, 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.config;

import java.util.Collection;

import static com.hazelcast.internal.util.Preconditions.isNotNull;

/**
 * Contains the 3 different join configurations; TCP-IP/multicast/AWS. Only one of them should be enabled!
 */
public class JoinConfig {

    private MulticastConfig multicastConfig = new MulticastConfig();

    private TcpIpConfig tcpIpConfig = new TcpIpConfig();

    private AwsConfig awsConfig = new AwsConfig();

    private GcpConfig gcpConfig = new GcpConfig();

    private AzureConfig azureConfig = new AzureConfig();

    private KubernetesConfig kubernetesConfig = new KubernetesConfig();

    private EurekaConfig eurekaConfig = new EurekaConfig();

    private DiscoveryConfig discoveryConfig = new DiscoveryConfig();

    /**
     * @return the multicastConfig join configuration
     */
    public MulticastConfig getMulticastConfig() {
        return multicastConfig;
    }

    /**
     * @param multicastConfig the multicastConfig join configuration to set
     * @throws IllegalArgumentException if multicastConfig is null
     */
    public JoinConfig setMulticastConfig(final MulticastConfig multicastConfig) {
        this.multicastConfig = isNotNull(multicastConfig, "multicastConfig");
        return this;
    }

    /**
     * @return the tcpIpConfig
     */
    public TcpIpConfig getTcpIpConfig() {
        return tcpIpConfig;
    }

    /**
     * @param tcpIpConfig the tcpIpConfig join configuration to set
     * @throws IllegalArgumentException if tcpIpConfig is null
     */
    public JoinConfig setTcpIpConfig(final TcpIpConfig tcpIpConfig) {
        this.tcpIpConfig = isNotNull(tcpIpConfig, "tcpIpConfig");
        return this;
    }

    /**
     * @return the awsConfig join configuration
     */
    public AwsConfig getAwsConfig() {
        return awsConfig;
    }

    /**
     * @param awsConfig the AwsConfig join configuration to set
     * @throws IllegalArgumentException if awsConfig is null
     */
    public JoinConfig setAwsConfig(final AwsConfig awsConfig) {
        this.awsConfig = isNotNull(awsConfig, "awsConfig");
        return this;
    }

    /**
     * @return the gcpConfig join configuration
     */
    public GcpConfig getGcpConfig() {
        return gcpConfig;
    }

    /**
     * @param gcpConfig the GcpConfig join configuration to set
     * @throws IllegalArgumentException if gcpConfig is null
     */
    public JoinConfig setGcpConfig(final GcpConfig gcpConfig) {
        this.gcpConfig = isNotNull(gcpConfig, "gcpConfig");
        return this;
    }

    /**
     * @return the azureConfig join configuration
     */
    public AzureConfig getAzureConfig() {
        return azureConfig;
    }

    /**
     * @param azureConfig the AzureConfig join configuration to set
     * @throws IllegalArgumentException if azureConfig is null
     */
    public JoinConfig setAzureConfig(final AzureConfig azureConfig) {
        this.azureConfig = isNotNull(azureConfig, "azureConfig");
        return this;
    }

    /**
     * @return the kubernetesConfig join configuration
     */
    public KubernetesConfig getKubernetesConfig() {
        return kubernetesConfig;
    }

    /**
     * @param kubernetesConfig the KubernetesConfig join configuration to set
     * @throws IllegalArgumentException if kubernetesConfig is null
     */
    public JoinConfig setKubernetesConfig(final KubernetesConfig kubernetesConfig) {
        this.kubernetesConfig = isNotNull(kubernetesConfig, "kubernetesConfig");
        return this;
    }

    /**
     * @return the eurekaConfig join configuration
     */
    public EurekaConfig getEurekaConfig() {
        return eurekaConfig;
    }

    /**
     * @param eurekaConfig the EurekaConfig join configuration to set
     * @throws IllegalArgumentException if eurekaConfig is null
     */
    public JoinConfig setEurekaConfig(final EurekaConfig eurekaConfig) {
        this.eurekaConfig = isNotNull(eurekaConfig, "eurekaConfig");
        return this;
    }

    /**
     * Returns the currently defined {@link DiscoveryConfig}
     *
     * @return current DiscoveryProvidersConfig instance
     */
    public DiscoveryConfig getDiscoveryConfig() {
        return discoveryConfig;
    }

    /**
     * Sets a custom defined {@link DiscoveryConfig}
     *
     * @param discoveryConfig configuration to set
     * @throws java.lang.IllegalArgumentException if discoveryProvidersConfig is null
     */
    public JoinConfig setDiscoveryConfig(DiscoveryConfig discoveryConfig) {
        this.discoveryConfig = isNotNull(discoveryConfig, "discoveryProvidersConfig");
        return this;
    }

    /**
     * Verifies this JoinConfig is valid. At most a single joiner should be active.
     *
     * @throws InvalidConfigurationException when the join config is not valid
     */
    @SuppressWarnings("checkstyle:npathcomplexity")
    public void verify() {
        int countEnabled = 0;
        if (getTcpIpConfig().isEnabled()) {
            countEnabled++;
        }
        if (getMulticastConfig().isEnabled()) {
            countEnabled++;
        }
        if (getAwsConfig().isEnabled()) {
            countEnabled++;
        }
        if (getGcpConfig().isEnabled()) {
            countEnabled++;
        }
        if (getAzureConfig().isEnabled()) {
            countEnabled++;
        }
        if (getKubernetesConfig().isEnabled()) {
            countEnabled++;
        }
        if (getEurekaConfig().isEnabled()) {
            countEnabled++;
        }
        Collection discoveryStrategyConfigs = discoveryConfig.getDiscoveryStrategyConfigs();
        countEnabled += discoveryStrategyConfigs.size();

        if (countEnabled > 1) {
            throw new InvalidConfigurationException("Multiple join configuration cannot be enabled at the same time. Enable only "
                    + "one of: TCP/IP, Multicast, AWS, GCP, Azure, Kubernetes, Eureka or Discovery Strategy");
        }
    }

    @Override
    public String toString() {
        return "JoinConfig{"
                + "multicastConfig=" + multicastConfig
                + ", tcpIpConfig=" + tcpIpConfig
                + ", awsConfig=" + awsConfig
                + ", gcpConfig=" + gcpConfig
                + ", azureConfig=" + azureConfig
                + ", kubernetesConfig=" + kubernetesConfig
                + ", eurekaConfig=" + eurekaConfig
                + ", discoveryConfig=" + discoveryConfig
                + '}';
    }
}