com.googlecode.arit.websphere.bug.JavaReflectionAdapterResourceScanner.java Source code

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Here is the source code for com.googlecode.arit.websphere.bug.JavaReflectionAdapterResourceScanner.java

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/*
 * Copyright 2010-2011 Andreas Veithen
 *
 * 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.googlecode.arit.websphere.bug;

import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;

import com.github.veithen.rbeans.RBeanFactory;
import com.github.veithen.rbeans.RBeanFactoryException;
import com.googlecode.arit.resource.ClassLoaderReference;
import com.googlecode.arit.resource.ResourceScanner;
import com.googlecode.arit.resource.ResourceType;
import com.googlecode.arit.resource.SimpleClassLoaderReference;
import com.googlecode.arit.resource.SimpleResource;

public class JavaReflectionAdapterResourceScanner implements ResourceScanner {
    private final RBeanFactory rbf;
    private final JavaReflectionAdapterStaticRBean rbean;
    private static final Log LOG = LogFactory.getLog(JavaReflectionAdapterResourceScanner.class);

    @Autowired
    @Qualifier("websphere-bug")
    private ResourceType resourceType;

    public JavaReflectionAdapterResourceScanner() {
        RBeanFactory rbf;
        try {
            rbf = new RBeanFactory(JavaReflectionAdapterStaticRBean.class, JavaReflectionAdapterRBean.class);
        } catch (RBeanFactoryException ex) {
            rbf = null;
        }
        this.rbf = rbf;
        this.rbean = rbf == null ? null : rbf.createRBean(JavaReflectionAdapterStaticRBean.class);
    }

    public String getDescription() {
        return "Cached JavaReflectionAdapter instances (JR40617)";
    }

    public boolean isAvailable() {
        return rbean != null;
    }

    public void scanForResources(ResourceListener resourceEventListener) {
        Map<Object, Object> cache = rbean.getAdapters();
        for (Entry<Object, Object> entry : cache.entrySet()) {
            Object key = entry.getKey();
            Object adapter = entry.getValue();
            Class<?> clazz;
            ClassLoaderReference clRef;
            // In the original JavaReflectionAdapter code, the key was a Class object
            // (causing the class loader leak). The interim fix changes this to a String.
            if (key instanceof String) {
                clazz = rbf.createRBean(JavaReflectionAdapterRBean.class, adapter).getClazz();
                clRef = new SimpleClassLoaderReference(clazz.getClassLoader(), "JavaReflectionAdapter instance");
            } else if (key instanceof Class<?>) {
                clazz = (Class<?>) key;
                clRef = new SimpleClassLoaderReference(clazz.getClassLoader(), "Cache key");
            } else {
                LOG.error(
                        "Unknown JavaReflectionAdapter cache key type encountered in JavaReflectionAdapter cache: "
                                + key.getClass().getName());
                break;
            }

            String description = "Cached JavaReflectionAdapter for class " + clazz.getName();
            SimpleResource<Object> resource = new SimpleResource<Object>(resourceType, adapter, description);
            resource.addClassloaderReference(clRef);
            resourceEventListener.onResourceFound(resource);
        }
    }
}