/*
 * 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.registration;

import akka.dispatch.Futures;

import org.apache.flink.runtime.concurrent.Future;
import org.apache.flink.runtime.concurrent.impl.FlinkCompletableFuture;
import org.apache.flink.runtime.rpc.TestingGatewayBase;
import org.apache.flink.util.Preconditions;

import java.util.UUID;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

public class TestRegistrationGateway extends TestingGatewayBase {

	private final BlockingQueue<RegistrationCall> invocations;

	private final RegistrationResponse[] responses;

	private int pos;

	public TestRegistrationGateway(RegistrationResponse... responses) {
		Preconditions.checkArgument(responses != null && responses.length > 0);

		this.invocations = new LinkedBlockingQueue<>();
		this.responses = responses;
		
	}

	// ------------------------------------------------------------------------

	public Future<RegistrationResponse> registrationCall(UUID leaderId, long timeout) {
		invocations.add(new RegistrationCall(leaderId, timeout));

		RegistrationResponse response = responses[pos];
		if (pos < responses.length - 1) {
			pos++;
		}

		// return a completed future (for a proper value), or one that never completes and will time out (for null)
		return response != null ? FlinkCompletableFuture.completed(response) : this.<RegistrationResponse>futureWithTimeout(timeout);
	}

	public BlockingQueue<RegistrationCall> getInvocations() {
		return invocations;
	}

	// ------------------------------------------------------------------------

	public static class RegistrationCall {
		private final UUID leaderId;
		private final long timeout;

		public RegistrationCall(UUID leaderId, long timeout) {
			this.leaderId = leaderId;
			this.timeout = timeout;
		}

		public UUID leaderId() {
			return leaderId;
		}

		public long timeout() {
			return timeout;
		}
	}
}