com.linecorp.armeria.xds.ResourceWatcher Maven / Gradle / Ivy

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/*
 * Copyright 2023 LINE Corporation
 *
 * LINE Corporation 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:
 *
 *   https://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.linecorp.armeria.xds;

import io.grpc.Status;

/**
 * A resource watcher.
 *
 * @param  the type of the {@link XdsResource} that is notified
 */
@FunctionalInterface
interface ResourceWatcher {

    default void onError(XdsType type, Status error) {}

    default void onResourceDoesNotExist(XdsType type, String resourceName) {}

    void onChanged(T update);
}