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/*
* ============LICENSE_START=======================================================
* utils
* ================================================================================
* Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.utils.services;
import static org.junit.Assert.assertEquals;
import java.util.List;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
public class OrderedServiceImplTest {
private static final int HIGH_PRIORITY_NUM = -1000;
private static final int LOW_PRIORITY_NUM = 1000;
private static GenericService highPrioService;
private static GenericService lowPrioService;
/**
* Saves the original state of the ordered service list to restore after each test.
*/
@BeforeClass
public static void setup() {
List<GenericService> implementers = GenericService.providers.getList();
highPrioService = implementers.get(0);
lowPrioService = implementers.get(1);
}
/**
* Restores original state after each test.
*/
@Before
public void resetOrder() {
highPrioService.setSequenceNumber(HIGH_PRIORITY_NUM);
lowPrioService.setSequenceNumber(LOW_PRIORITY_NUM);
}
/**
* Tests obtaining a list of service implementers.
*/
@Test
public void getListTest() {
List<GenericService> implementers = GenericService.providers.getList();
assertEquals(2, implementers.size());
assertEquals(highPrioService, implementers.get(0));
assertEquals(HIGH_PRIORITY_NUM, highPrioService.getSequenceNumber());
assertEquals(lowPrioService, implementers.get(1));
assertEquals(LOW_PRIORITY_NUM, lowPrioService.getSequenceNumber());
}
/**
* Tests inverting the priority of two services to ensure the list is rebuilt
* with the new order.
*/
@Test
public void rebuildListInvertedPriorityTest() {
List<GenericService> implementers = GenericService.providers.getList();
assertEquals(2, implementers.size());
assertEquals(highPrioService, implementers.get(0));
assertEquals(HIGH_PRIORITY_NUM, highPrioService.getSequenceNumber());
assertEquals(lowPrioService, implementers.get(1));
assertEquals(LOW_PRIORITY_NUM, lowPrioService.getSequenceNumber());
highPrioService.setSequenceNumber(LOW_PRIORITY_NUM);
lowPrioService.setSequenceNumber(HIGH_PRIORITY_NUM);
implementers = GenericService.providers.rebuildList();
assertEquals(2, implementers.size());
assertEquals(lowPrioService, implementers.get(0));
assertEquals(HIGH_PRIORITY_NUM, lowPrioService.getSequenceNumber());
assertEquals(highPrioService, implementers.get(1));
assertEquals(LOW_PRIORITY_NUM, highPrioService.getSequenceNumber());
}
/**
* Tests that the service list is ordered alphabetically by class names
* if the priorities are equivalent.
*/
@Test
public void rebuildListEqualPriorityTest() {
List<GenericService> implementers = GenericService.providers.getList();
assertEquals(2, implementers.size());
assertEquals(highPrioService, implementers.get(0));
assertEquals(HIGH_PRIORITY_NUM, highPrioService.getSequenceNumber());
assertEquals(lowPrioService, implementers.get(1));
assertEquals(LOW_PRIORITY_NUM, lowPrioService.getSequenceNumber());
highPrioService.setSequenceNumber(LOW_PRIORITY_NUM);
lowPrioService.setSequenceNumber(LOW_PRIORITY_NUM);
implementers = GenericService.providers.rebuildList();
assertEquals(2, implementers.size());
assertEquals(highPrioService, implementers.get(0));
assertEquals(LOW_PRIORITY_NUM, highPrioService.getSequenceNumber());
assertEquals(lowPrioService, implementers.get(1));
assertEquals(LOW_PRIORITY_NUM, lowPrioService.getSequenceNumber());
}
/**
* Test interface that extends OrderedService to allow changing the sequence number.
*/
public static interface GenericService extends OrderedService {
/**
* Providers of the GenericService interface.
*/
OrderedServiceImpl<GenericService> providers = new OrderedServiceImpl<>(GenericService.class);
/**
* Sets the sequence number of the service.
*/
public void setSequenceNumber(int seqNum);
}
/**
* A high priority service class.
*/
public static class HighPriorityService implements GenericService {
/**
* Defaults to a high priority.
*/
private int seqNum = HIGH_PRIORITY_NUM;
/**
* {@inheritDoc}.
*/
@Override
public int getSequenceNumber() {
return this.seqNum;
}
/**
* {@inheritDoc}.
*/
@Override
public void setSequenceNumber(int seqNum) {
this.seqNum = seqNum;
}
}
/**
* A low priority service class.
*/
public static class LowPriorityService implements GenericService {
/**
* Defaults to a low priority.
*/
private int seqNum = LOW_PRIORITY_NUM;
/**
* {@inheritDoc}.
*/
@Override
public int getSequenceNumber() {
return this.seqNum;
}
/**
* {@inheritDoc}.
*/
@Override
public void setSequenceNumber(int seqNum) {
this.seqNum = seqNum;
}
}
}
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