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Pedal is an idiomatic JPA and Spring based DAO framework.

There is a newer version: 1.5.1

/**
 * Copyright (c) 2014 Eclectic Logic LLC
 * 
 * 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.eclecticlogic.pedal.impl;

import java.util.HashMap;
import java.util.Map;

import org.springframework.transaction.support.TransactionSynchronization;
import org.springframework.transaction.support.TransactionSynchronizationAdapter;
import org.springframework.transaction.support.TransactionSynchronizationManager;

import com.eclecticlogic.pedal.DataContext;

/**
 * @author karthik abram
 */
public class TransactionSynchronizationAdapterData extends TransactionSynchronizationAdapter implements DataContext {

    private Map data = new HashMap<>();


    static TransactionSynchronizationAdapterData instance() {
        for (TransactionSynchronization sync : TransactionSynchronizationManager.getSynchronizations()) {
            if (sync instanceof TransactionSynchronizationAdapterData) {
                return (TransactionSynchronizationAdapterData) sync;
            }
        }
        return null;
    }


    @Override
    public void put(Object key, Object value) {
        data.put(key, value);
    }


    @Override
    @SuppressWarnings("unchecked")
    public  T get(Object key) {
        return (T) data.get(key);
    }


    @Override
    public void afterCompletion(int status) {
        data.clear();
    }

}