Package org.apache.openejb.assembler.classic

Source Code of org.apache.openejb.assembler.classic.MethodTransactionBuilder$MethodTransactionComparator

/**
* 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.openejb.assembler.classic;

import static org.apache.openejb.assembler.classic.MethodInfoUtil.resolveAttributes;
import org.apache.openejb.core.CoreDeploymentInfo;
import org.apache.openejb.OpenEJBException;
import org.apache.openejb.DeploymentInfo;
import org.apache.openejb.util.Logger;
import org.apache.openejb.util.LogCategory;

import java.util.List;
import java.util.HashMap;
import java.util.Map;
import java.util.ArrayList;
import java.util.Collections;
import java.lang.reflect.Method;

/**
* @version $Rev: 646050 $ $Date: 2008-04-08 12:46:04 -0700 (Tue, 08 Apr 2008) $
*/
public class MethodTransactionBuilder {

    public static final Logger logger = Logger.getInstance(LogCategory.OPENEJB_STARTUP, MethodTransactionBuilder.class);

    public void build(HashMap<String, DeploymentInfo> deployments, List<MethodTransactionInfo> methodTransactions) throws OpenEJBException {
        for (DeploymentInfo deploymentInfo : deployments.values()) {
            applyTransactionAttributes((CoreDeploymentInfo) deploymentInfo, methodTransactions);
        }
    }

    public static void applyTransactionAttributes(CoreDeploymentInfo deploymentInfo, List<MethodTransactionInfo> methodTransactionInfos) throws OpenEJBException {

        if (deploymentInfo.isBeanManagedTransaction()) return;

        methodTransactionInfos = normalize(methodTransactionInfos);

        Map<Method, MethodAttributeInfo> attributes = resolveAttributes(methodTransactionInfos, deploymentInfo);

        Logger log = Logger.getInstance(LogCategory.OPENEJB_STARTUP.createChild("attributes"), MethodTransactionBuilder.class);
        if (log.isDebugEnabled()) {
            for (Map.Entry<Method, MethodAttributeInfo> entry : attributes.entrySet()) {
                Method method = entry.getKey();
                MethodTransactionInfo value = (MethodTransactionInfo) entry.getValue();
                log.debug("Transaction Attribute: " + method + " -- " + MethodInfoUtil.toString(value));
            }
        }

        for (Map.Entry<Method, MethodAttributeInfo> entry : attributes.entrySet()) {
            MethodTransactionInfo value = (MethodTransactionInfo) entry.getValue();

//            logger.info(entry.getKey().toString() +"  "+ value.transAttribute);
            deploymentInfo.setMethodTransactionAttribute(entry.getKey(), value.transAttribute);
        }
    }

    /**
     * This method splits the MethodTransactionInfo objects so that there is
     * exactly one MethodInfo per MethodTransactionInfo.  A single MethodTransactionInfo
     * with three MethodInfos would be expanded into three MethodTransactionInfo with
     * one MethodInfo each.
     *
     * The MethodTransactionInfo list is then sorted from least to most specific.
     *
     * @param infos
     * @return a normalized list of new MethodTransactionInfo objects
     */
    public static List<MethodTransactionInfo> normalize(List<MethodTransactionInfo> infos){
        List<MethodTransactionInfo> normalized = new ArrayList<MethodTransactionInfo>();
        for (MethodTransactionInfo oldInfo : infos) {
            for (MethodInfo methodInfo : oldInfo.methods) {
                MethodTransactionInfo newInfo = new MethodTransactionInfo();
                newInfo.description = oldInfo.description;
                newInfo.methods.add(methodInfo);
                newInfo.transAttribute = oldInfo.transAttribute;

                normalized.add(newInfo);
            }
        }

        Collections.reverse(normalized);
        Collections.sort(normalized, new MethodTransactionComparator());

        return normalized;
    }

    public static class MethodTransactionComparator extends MethodInfoUtil.BaseComparator<MethodTransactionInfo> {
        public int compare(MethodTransactionInfo a, MethodTransactionInfo b) {
            return compare(a.methods.get(0), b.methods.get(0));
        }
    }
}
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