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JPA implementation for Drools

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/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 *      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.drools.persistence;

import javax.transaction.TransactionSynchronizationRegistry;

import org.drools.persistence.jta.JtaTransactionSynchronizationAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TransactionSynchronizationRegistryHelper {

    private static final Logger logger = LoggerFactory.getLogger(TransactionSynchronizationRegistryHelper.class);
    public static void registerTransactionSynchronization(final Object tsro, final TransactionSynchronization ts) {
        TransactionSynchronizationRegistry tsr = ( TransactionSynchronizationRegistry ) tsro;
        tsr.registerInterposedSynchronization( new JtaTransactionSynchronizationAdapter( ts ) );
    }

    public static void putResource(final Object tsro, final Object key, final Object resource) {
        TransactionSynchronizationRegistry tsr = ( TransactionSynchronizationRegistry ) tsro;
        try {
            tsr.putResource(key, resource);
        } catch (IllegalStateException e) {
            // IllegalStateException is thrown when no transaction is active
            // so report only when there is actually resource to be inserted
            if (resource != null) {
                logger.warn("Unable to put resource {} value {} due to {}", key, resource, e.getMessage());
            }
        } catch (Exception e) {
            logger.warn("Unable to put resource {} value {} due to {}", key, resource, e.getMessage());
        }
    }

    public static Object getResource(final Object tsro, final Object key) {
        TransactionSynchronizationRegistry tsr = ( TransactionSynchronizationRegistry ) tsro;
        try {
            return tsr.getResource(key);
        } catch (Exception e) {
            return null;
        }
    }
}