com.google.template.soy.jbcsrc.MemoryClassLoaderTest.java Source code

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Here is the source code for com.google.template.soy.jbcsrc.MemoryClassLoaderTest.java

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/*
 * Copyright 2015 Google Inc.
 *
 * 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.google.template.soy.jbcsrc;

import static com.google.template.soy.jbcsrc.SoyExpression.FALSE;

import com.google.common.io.ByteStreams;
import com.google.common.testing.GcFinalization;
import com.google.template.soy.jbcsrc.ExpressionTester.BooleanInvoker;

import junit.framework.TestCase;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.ClassNode;

import java.io.IOException;
import java.lang.ref.WeakReference;

/**
 * Tests for {@link MemoryClassLoader}
 */
public class MemoryClassLoaderTest extends TestCase {

    // Our memory classloaders should be garbage collectable when all references to their types 
    // disapear
    public void testCollectable() {
        BooleanInvoker invoker = ExpressionTester.createInvoker(BooleanInvoker.class, FALSE);
        assertEquals(false, invoker.invoke()); // sanity, the invoker works
        MemoryClassLoader loader = (MemoryClassLoader) invoker.getClass().getClassLoader();
        WeakReference<MemoryClassLoader> loaderRef = new WeakReference<MemoryClassLoader>(loader);
        invoker = null; // unpin
        loader = null;
        GcFinalization.awaitClear(loaderRef);
    }

    public void testAsResource() throws IOException {
        BooleanInvoker invoker = ExpressionTester.createInvoker(BooleanInvoker.class, FALSE);
        byte[] classBytes = ByteStreams.toByteArray(invoker.getClass().getClassLoader()
                .getResourceAsStream(invoker.getClass().getName().replace('.', '/') + ".class"));
        ClassNode node = new ClassNode();
        new ClassReader(classBytes).accept(node, 0);
        assertEquals(Type.getInternalName(invoker.getClass()), node.name);
    }
}