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CachedExpressionEvaluatorTests.java
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CachedExpressionEvaluatorTests.java
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/*
* Copyright 2002-2022 the original author or authors.
*
* 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
*
* https://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.springframework.context.expression;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.junit.jupiter.api.Test;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.util.ReflectionUtils;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.InstanceOfAssertFactories.BOOLEAN;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
/**
* @author Stephane Nicoll
*/
public class CachedExpressionEvaluatorTests {
private final TestExpressionEvaluator expressionEvaluator = new TestExpressionEvaluator();
@Test
public void parseNewExpression() {
Method method = ReflectionUtils.findMethod(getClass(), "toString");
Expression expression = expressionEvaluator.getTestExpression("true", method, getClass());
hasParsedExpression("true");
assertThat(expression.getValue()).asInstanceOf(BOOLEAN).isTrue();
assertThat(expressionEvaluator.testCache.size()).as("Expression should be in cache").isEqualTo(1);
}
@Test
public void cacheExpression() {
Method method = ReflectionUtils.findMethod(getClass(), "toString");
expressionEvaluator.getTestExpression("true", method, getClass());
expressionEvaluator.getTestExpression("true", method, getClass());
expressionEvaluator.getTestExpression("true", method, getClass());
hasParsedExpression("true");
assertThat(expressionEvaluator.testCache.size()).as("Only one expression should be in cache").isEqualTo(1);
}
@Test
public void cacheExpressionBasedOnConcreteType() {
Method method = ReflectionUtils.findMethod(getClass(), "toString");
expressionEvaluator.getTestExpression("true", method, getClass());
expressionEvaluator.getTestExpression("true", method, Object.class);
assertThat(expressionEvaluator.testCache.size()).as("Cached expression should be based on type").isEqualTo(2);
}
private void hasParsedExpression(String expression) {
verify(expressionEvaluator.getParser(), times(1)).parseExpression(expression);
}
private static class TestExpressionEvaluator extends CachedExpressionEvaluator {
private final Map<ExpressionKey, Expression> testCache = new ConcurrentHashMap<>();
public TestExpressionEvaluator() {
super(mockSpelExpressionParser());
}
public Expression getTestExpression(String expression, Method method, Class<?> type) {
return getExpression(this.testCache, new AnnotatedElementKey(method, type), expression);
}
private static SpelExpressionParser mockSpelExpressionParser() {
SpelExpressionParser parser = new SpelExpressionParser();
return spy(parser);
}
}
}