WeakListenerListTest.java
/**
* Copyright (c) 2018, RTE (http://www.rte-france.com)
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
* SPDX-License-Identifier: MPL-2.0
*/
package com.powsybl.commons.util;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
/**
* @author Geoffroy Jamgotchian {@literal <geoffroy.jamgotchian at rte-france.com>}
*/
class WeakListenerListTest {
interface TestListener {
void onTest();
}
@Test
void concurrencyIssueTest() {
// 2 adds using a different target object
WeakListenerList<TestListener> listeners = new WeakListenerList<>();
TestListener l = () -> {
TestListener l2 = () -> {
};
listeners.add(l2);
};
listeners.add(l);
// check there is no more java.util.ConcurrentModificationException coming from
// the WeakHashMap
listeners.notify(TestListener::onTest);
assertTrue(listeners.remove(l));
assertFalse(listeners.remove(l));
}
@Test
void sampleTest() {
// 2 adds using a different target object
WeakListenerList<TestListener> listeners = new WeakListenerList<>();
TestListener l1 = () -> { };
TestListener l2 = () -> { };
listeners.add(l1);
listeners.add(l2);
assertEquals(2, listeners.size());
assertTrue(listeners.remove(l1));
assertEquals(1, listeners.size());
listeners.removeAll();
assertEquals(0, listeners.size());
}
}