performancemonitorinterceptortests.java

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/*
 * Copyright 2002-2006 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
 *
 *      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.springframework.aop.interceptor;

import junit.framework.TestCase;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.commons.logging.Log;
import org.easymock.MockControl;

import java.lang.reflect.Method;

/**
 * Unit tests for the {@link PerformanceMonitorInterceptor} class.
 *
 * @author Rob Harrop
 * @author Rick Evans
 */
public class PerformanceMonitorInterceptorTests extends TestCase {

    public void testSuffixAndPrefixAssignment() {
        PerformanceMonitorInterceptor interceptor = new PerformanceMonitorInterceptor();

        assertNotNull(interceptor.getPrefix());
        assertNotNull(interceptor.getSuffix());

        interceptor.setPrefix(null);
        interceptor.setSuffix(null);

        assertNotNull(interceptor.getPrefix());
        assertNotNull(interceptor.getSuffix());
    }

    public void testSunnyDayPathLogsPerformanceMetricsCorrectly() throws Throwable {
        MockControl mockLog = MockControl.createControl(Log.class);
        Log log = (Log) mockLog.getMock();

        MockControl mockMethodInvocation = MockControl.createControl(MethodInvocation.class);
        MethodInvocation methodInvocation = (MethodInvocation) mockMethodInvocation.getMock();

        Method toString = String.class.getMethod("toString", new Class[] {});

        methodInvocation.getMethod();
        mockMethodInvocation.setReturnValue(toString);
        methodInvocation.getMethod();
        mockMethodInvocation.setReturnValue(toString);
        methodInvocation.proceed();
        mockMethodInvocation.setReturnValue(null);
        log.trace("Some performance metric");
        mockLog.setMatcher(MockControl.ALWAYS_MATCHER);
        mockLog.setVoidCallable();

        mockMethodInvocation.replay();
        mockLog.replay();

        PerformanceMonitorInterceptor interceptor = new PerformanceMonitorInterceptor(true);
        interceptor.invokeUnderTrace(methodInvocation, log);

        mockLog.verify();
        mockMethodInvocation.verify();
    }

    public void testExceptionPathStillLogsPerformanceMetricsCorrectly() throws Throwable {
        MockControl mockLog = MockControl.createControl(Log.class);
        final Log log = (Log) mockLog.getMock();

        MockControl mockMethodInvocation = MockControl.createControl(MethodInvocation.class);
        final MethodInvocation methodInvocation = (MethodInvocation) mockMethodInvocation.getMock();

        Method toString = String.class.getMethod("toString", new Class[] {});

        methodInvocation.getMethod();
        mockMethodInvocation.setReturnValue(toString);
        methodInvocation.getMethod();
        mockMethodInvocation.setReturnValue(toString);
        methodInvocation.proceed();
        mockMethodInvocation.setThrowable(new IllegalArgumentException());
        log.trace("Some performance metric");
        mockLog.setMatcher(MockControl.ALWAYS_MATCHER);
        mockLog.setVoidCallable();

        mockMethodInvocation.replay();
        mockLog.replay();

        final PerformanceMonitorInterceptor interceptor = new PerformanceMonitorInterceptor(true);

        try {
            interceptor.invokeUnderTrace(methodInvocation, log);
            fail("Must have propagated the IllegalArgumentException.");
        } catch (IllegalArgumentException expected) {
        }

        mockLog.verify();
        mockMethodInvocation.verify();
    }

}