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/*
 *
 *  Copyright 2011 Netflix, Inc.
 *
 *     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.netflix.curator.x.discovery;

import com.netflix.curator.x.discovery.strategies.RoundRobinStrategy;
import java.io.Closeable;
import java.util.Collection;

public interface ServiceDiscovery extends Closeable
{
    /**
     * The discovery must be started before use
     *
     * @throws Exception errors
     */
    public void start() throws Exception;

    /**
     * Register/re-register a service
     *
     * @param service service to add
     * @throws Exception errors
     */
    public void     registerService(ServiceInstance service) throws Exception;

    /**
     * Update a service
     *
     * @param service service to update
     * @throws Exception errors
     */
    public void     updateService(ServiceInstance service) throws Exception;

    /**
     * Unregister/remove a service instance
     *
     * @param service the service
     * @throws Exception errors
     */
    public void     unregisterService(ServiceInstance service) throws Exception;

    /**
     * Allocate a new service cache builder. The refresh padding is defaulted to 1 second.
     *
     * @return new cache builder
     */
    public ServiceCacheBuilder serviceCacheBuilder();

    /**
     * Return the names of all known services
     *
     * @return list of service names
     * @throws Exception errors
     */
    public Collection queryForNames() throws Exception;

    /**
     * Return all known instances for the given service
     *
     * @param name name of the service
     * @return list of instances (or an empty list)
     * @throws Exception errors
     */
    public Collection>  queryForInstances(String name) throws Exception;

    /**
     * Return a service instance POJO
     *
     * @param name name of the service
     * @param id ID of the instance
     * @return the instance or null if not found
     * @throws Exception errors
     */
    public ServiceInstance queryForInstance(String name, String id) throws Exception;

    /**
     * Allocate a new builder. {@link ServiceProviderBuilder#providerStrategy} is set to {@link RoundRobinStrategy}
     * and {@link ServiceProviderBuilder#refreshPaddingMs} is set to 1 second.
     *
     * @return the builder
     */
    public ServiceProviderBuilder serviceProviderBuilder();
}