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/**
 * Copyright (C) 2011 Ovea 
 *
 * 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.ovea.tajin.framework.jmx;

import com.ovea.tajin.framework.jmx.annotation.JmxBean;

import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.Map;
import java.util.WeakHashMap;

/**
 * @author Mathieu Carbou ([email protected])
 */
public final class Assemblers {

    private static final Map, Reference> cache = new WeakHashMap, Reference>();

    private Assemblers() {
    }

    public static JmxMetadataAssembler get(Class mbeanClass) {
        JmxBean jmxBean = mbeanClass.getAnnotation(JmxBean.class);
        return jmxBean == null ? load(PublicMetadataAssembler.class) : load(jmxBean.assembler());
    }

    private static JmxMetadataAssembler load(Class exp) {
        if (exp == null) exp = AnnotationMetadataAssembler.class;
        Reference ref = cache.get(exp);
        JmxMetadataAssembler exposure;
        if (ref != null) {
            exposure = ref.get();
            if (exposure != null)
                return exposure;
        }
        try {
            exposure = exp.getConstructor().newInstance();
        } catch (Throwable e) {
            throw ExceptionUtils.rethrow(e);
        }
        cache.put(exp, new WeakReference(exposure));
        return exposure;
    }

}