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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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.
*/
package com.android.apkzlib.utils;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import org.junit.Test;
import java.util.function.Supplier;
public class CachedSupplierTest {
@Test
public void testGetsOnlyOnce() {
TestSupplier ts = new TestSupplier();
CachedSupplier<String> cs = new CachedSupplier<>(ts);
assertFalse(cs.isValid());
ts.value = "foo";
assertEquals(0, ts.invocationCount);
assertEquals("foo", cs.get());
assertEquals(1, ts.invocationCount);
assertTrue(cs.isValid());
ts.value = "bar";
assertEquals("foo", cs.get());
assertEquals(1, ts.invocationCount);
assertTrue(cs.isValid());
}
@Test
public void cacheCanBePreset() {
TestSupplier ts = new TestSupplier();
ts.value = "foo";
CachedSupplier<String> cs = new CachedSupplier<>(ts);
cs.precomputed("bar");
assertTrue(cs.isValid());
assertEquals("bar", cs.get());
assertEquals(0, ts.invocationCount);
}
@Test
public void exceptionThrownBySupplier() {
CachedSupplier<String> cs = new CachedSupplier<>(() -> {
throw new RuntimeException("foo");
});
assertFalse(cs.isValid());
try {
cs.get();
fail();
} catch (RuntimeException e) {
assertEquals("foo", e.getMessage());
}
assertFalse(cs.isValid());
try {
cs.get();
fail();
} catch (RuntimeException e) {
assertEquals("foo", e.getMessage());
}
}
@Test
public void reset() {
TestSupplier ts = new TestSupplier();
ts.value = "foo";
CachedSupplier<String> cs = new CachedSupplier<>(ts);
assertFalse(cs.isValid());
assertEquals("foo", cs.get());
assertEquals(1, ts.invocationCount);
assertTrue(cs.isValid());
ts.value = "bar";
cs.reset();
assertFalse(cs.isValid());
assertEquals("bar", cs.get());
assertEquals(2, ts.invocationCount);
}
static class TestSupplier implements Supplier<String> {
int invocationCount = 0;
String value;
@Override
public String get() {
invocationCount++;
return value;
}
}
}
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