curator-master/curator-x-discovery-server/src/main/java/org/apache/curator/x/discovery/server/rest/DiscoveryContext.java
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.curator.x.discovery.server.rest;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.apache.curator.x.discovery.ProviderStrategy;
import org.apache.curator.x.discovery.ServiceDiscovery;

/**
 * Bridge between the specifics of your needs and the generic implementation
 */
public interface DiscoveryContext<T> {
    /**
     * Return the threshold in milliseconds to consider a registration stale
     *
     * @return number of milliseconds
     */
    public int getInstanceRefreshMs();

    /**
     * Return the service singleton
     *
     * @return service
     */
    public ServiceDiscovery<T> getServiceDiscovery();

    /**
     * Serialize your payload
     *
     * @param node the node to serialize into
     * @param fieldName field name to use
     * @param payload the payload value (can be null)
     * @throws Exception any errors
     */
    public void marshallJson(ObjectNode node, String fieldName, T payload) throws Exception;

    /**
     * Deserialize your payload
     *
     * @param node the node that has the payload
     * @return the payload or null
     * @throws Exception any errors
     */
    public T unMarshallJson(JsonNode node) throws Exception;

    /**
     * Return the provider strategy to use for {@link DiscoveryResource#getAny(String)}
     *
     * @return strategy
     */
    public ProviderStrategy<T> getProviderStrategy();
}
