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/*
 * 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.flink.runtime.rest.handler.cluster;

import org.apache.flink.api.common.time.Time;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.rest.handler.AbstractRestHandler;
import org.apache.flink.runtime.rest.handler.HandlerRequest;
import org.apache.flink.runtime.rest.handler.RestHandlerException;
import org.apache.flink.runtime.rest.messages.ClusterConfigurationInfo;
import org.apache.flink.runtime.rest.messages.EmptyMessageParameters;
import org.apache.flink.runtime.rest.messages.EmptyRequestBody;
import org.apache.flink.runtime.rest.messages.MessageHeaders;
import org.apache.flink.runtime.webmonitor.RestfulGateway;
import org.apache.flink.runtime.webmonitor.retriever.GatewayRetriever;
import org.apache.flink.util.Preconditions;

import javax.annotation.Nonnull;

import java.util.Map;
import java.util.concurrent.CompletableFuture;

/**
 * Handler which serves the cluster's configuration.
 */
public class ClusterConfigHandler extends AbstractRestHandler {

	private final ClusterConfigurationInfo clusterConfig;

	public ClusterConfigHandler(
			GatewayRetriever leaderRetriever,
			Time timeout,
			Map responseHeaders,
			MessageHeaders messageHeaders,
			Configuration configuration) {
		super(leaderRetriever, timeout, responseHeaders, messageHeaders);

		Preconditions.checkNotNull(configuration);
		this.clusterConfig = ClusterConfigurationInfo.from(configuration);
	}

	@Override
	protected CompletableFuture handleRequest(@Nonnull HandlerRequest request, @Nonnull RestfulGateway gateway) throws RestHandlerException {
		return CompletableFuture.completedFuture(clusterConfig);
	}
}