<commit_before>/*
 * 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.jena.graph.impl;

import org.apache.jena.graph.* ;
import org.apache.jena.shared.* ;

/**
 * A base for transaction handlers - all it does is provide the
 * canonical implementation of executeInTransaction.
 */
public abstract class TransactionHandlerBase implements TransactionHandler {
    public TransactionHandlerBase() {
        super() ;
    }

    /**
     * Execute the command <code>c</code> within a transaction. If it completes normally,
     * commit the transaction and return the result. Otherwise abort the transaction.
     */
    @Override
    public Object executeInTransaction(Command c) {
        begin() ;
        try {
            Object result = c.execute() ;
            commit() ;
            return result ;
        }
        catch (JenaException e) { abortSilent() ; throw e ; }
        catch (Throwable e)     { abortSilent() ; throw new JenaException(e) ; }
    }

    /* Abort but don't let problems with the transaction system itself cause loss of exception handling */ 
    private void abortSilent() {
        try { abort() ; } catch (Throwable th) {}
    }
}<commit_msg>If commit goes wrong, don't try abort<commit_after>/*
 * 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.jena.graph.impl;

import org.apache.jena.graph.* ;
import org.apache.jena.shared.* ;

/**
 * A base for transaction handlers - all it does is provide the
 * canonical implementation of executeInTransaction.
 */
public abstract class TransactionHandlerBase implements TransactionHandler {
    public TransactionHandlerBase() {
        super() ;
    }

    /**
     * Execute the command <code>c</code> within a transaction. If it completes normally,
     * commit the transaction and return the result. Otherwise abort the transaction.
     */
    @Override
    public Object executeInTransaction(Command c) {
        begin() ;
        Object result ;
        try { result = c.execute() ; }
        catch (JenaException e) { abortSilent() ; throw e ; }
        catch (Throwable e)     { abortSilent() ; throw new JenaException(e) ; }
        
        // If this goes wrong, propagate the exception
        commit() ;
        return result ;
    }

    /* Abort but don't let problems with the transaction system itself cause loss of the exception */ 
    private void abortSilent() {
        try { abort() ; } catch (Throwable th) {}
    }
}
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