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Gluon - Core micro services implementation.
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/**
 * Copyright 2017 Zaradai
 * 
 * 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.zaradai.gluon.server;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Maps;
import com.zaradai.gluon.MicroService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.ConcurrentMap;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.zaradai.gluon.util.Validations.checkString;

class MicroServiceRegistry {
    private static final Logger LOG = LoggerFactory.getLogger(MicroServiceRegistry.class);
    private final ConcurrentMap serviceByName;

    MicroServiceRegistry() {
        this.serviceByName = Maps.newConcurrentMap();
    }

    boolean contains(String serviceName) {
        return serviceByName.containsKey(validateServiceName(serviceName));
    }

    boolean remove(String serviceName) {
        return serviceByName.remove(validateServiceName(serviceName)) != null;
    }

    public  boolean remove(MicroService microService) {
        checkNotNull(microService, "Service cannot be null.");
        return remove(microService.name());
    }

    public  void register(MicroService microService) {
        checkNotNull(microService, "Service cannot be null.");
        final MicroService existing = serviceByName.putIfAbsent(microService.name(), microService);

        if (existing != null) {
            LOG.warn("Replacing existing service with name: {}", existing.name());
        }
    }

    public  MicroService get(String serviceName) {
        return serviceByName.get(validateServiceName(serviceName));
    }

    public ImmutableList getRegistered() {
        return ImmutableList.copyOf(serviceByName.keySet());
    }

    private String validateServiceName(String serviceName) {
        return checkString(serviceName, "Service name cannot be null or empty.");
    }
}