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java/org/apache/catalina/loader/ParallelWebappClassLoader.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.catalina.loader;
+
+import org.apache.catalina.LifecycleException;
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+
+public class ParallelWebappClassLoader extends WebappClassLoaderBase {
+
+    private static final Log log = LogFactory.getLog(ParallelWebappClassLoader.class);
+
+    static {
+        boolean result = ClassLoader.registerAsParallelCapable();
+        if (!result) {
+            log.warn(sm.getString("webappClassLoaderParallel.registrationFailed"));
+        }
+    }
+
+    public ParallelWebappClassLoader() {
+        super();
+    }
+
+
+    public ParallelWebappClassLoader(ClassLoader parent) {
+        super(parent);
+    }
+
+
+    /**
+     * Returns a copy of this class loader without any class file
+     * transformers. This is a tool often used by Java Persistence API
+     * providers to inspect entity classes in the absence of any
+     * instrumentation, something that can't be guaranteed within the
+     * context of a {@link java.lang.instrument.ClassFileTransformer}'s
+     * {@link java.lang.instrument.ClassFileTransformer#transform(ClassLoader,
+     * String, Class, java.security.ProtectionDomain, byte[]) transform} method.
+     * <p>
+     * The returned class loader's resource cache will have been cleared
+     * so that classes already instrumented will not be retained or
+     * returned.
+     *
+     * @return the transformer-free copy of this class loader.
+     */
+    @Override
+    public ParallelWebappClassLoader copyWithoutTransformers() {
+
+        ParallelWebappClassLoader result = new ParallelWebappClassLoader(getParent());
+
+        super.copyStateWithoutTransformers(result);
+
+        try {
+            result.start();
+        } catch (LifecycleException e) {
+            throw new IllegalStateException(e);
+        }
+
+        return result;
+    }
+}