io.dropwizard.discovery.client.io.dropwizard.ranger.ServiceDiscoveryClient.java Source code

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Here is the source code for io.dropwizard.discovery.client.io.dropwizard.ranger.ServiceDiscoveryClient.java

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/*
 * Copyright (c) 2016 Santanu Sinha <santanu.sinha@gmail.com>
 *
 * 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 io.dropwizard.discovery.client.io.dropwizard.ranger;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.flipkart.ranger.ServiceFinderBuilders;
import com.flipkart.ranger.finder.sharded.SimpleShardedServiceFinder;
import com.flipkart.ranger.model.ServiceNode;
import io.dropwizard.discovery.common.ShardInfo;
import lombok.Builder;
import lombok.extern.slf4j.Slf4j;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.RetryForever;

import java.util.List;
import java.util.Optional;

/**
 * Client that returns a healthy node from nodes for a particular environment
 */
@Slf4j
public class ServiceDiscoveryClient {
    private final ShardInfo criteria;
    private SimpleShardedServiceFinder<ShardInfo> serviceFinder;

    @Builder(builderMethodName = "fromConnectionString", builderClassName = "FromConnectionStringBuilder")
    ServiceDiscoveryClient(String namespace, String serviceName, String environment, ObjectMapper objectMapper,
            String connectionString) throws Exception {
        this(namespace, serviceName, environment, objectMapper,
                CuratorFrameworkFactory.newClient(connectionString, new RetryForever(5000)));
    }

    @Builder(builderMethodName = "fromCurator", builderClassName = "FromCuratorBuilder")
    ServiceDiscoveryClient(String namespace, String serviceName, String environment, ObjectMapper objectMapper,
            CuratorFramework curator) throws Exception {
        this.criteria = ShardInfo.builder().environment(environment).build();
        this.serviceFinder = ServiceFinderBuilders.<ShardInfo>shardedFinderBuilder().withCuratorFramework(curator)
                .withNamespace(namespace).withServiceName(serviceName).withDeserializer(data -> {
                    try {
                        return objectMapper.readValue(data, new TypeReference<ServiceNode<ShardInfo>>() {
                        });
                    } catch (Exception e) {
                        log.warn("Could not parse node data", e);
                    }
                    return null;
                }).build();
    }

    public void start() throws Exception {
        serviceFinder.start();
    }

    public void stop() throws Exception {
        serviceFinder.stop();
    }

    public Optional<ServiceNode<ShardInfo>> getNode() {
        return Optional.ofNullable(serviceFinder.get(criteria));
    }

    public List<ServiceNode<ShardInfo>> getAllNodes() {
        return serviceFinder.getAll(criteria);
    }

}