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TDB is a storage subsystem for Jena and ARQ, it is a native triple store providing persistent storage of triples/quads.

There is a newer version: 4.10.0

/*
 * 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.tdb.transaction;

public class SysTxnState
{
    final public long activeReaders ; 
    final public long activeWriters ;
    final public long finishedReaders ;
    final public long committedWriters ;
    final public long abortedWriters ;
    final public long queuedCommits ;
    
    SysTxnState(TransactionManager tm)
    {
        activeReaders = tm.activeReaders.get() ;
        activeWriters = tm.activeWriters.get() ;
        finishedReaders = tm.finishedReaders.get() ;
        committedWriters = tm.committedWriters.get() ;
        abortedWriters = tm.abortedWriters.get() ;
        queuedCommits = tm.commitedAwaitingFlush.size() ;
    }
    
    @Override
    public String toString()
    {
        return String.format("Active (R=%d W=%d) : Finished (R=%d, WC=%d, WA=%d) Queue %d",
                             activeReaders,
                             activeWriters,
                             finishedReaders,
                             committedWriters,
                             abortedWriters,
                             queuedCommits
        		) ;
    }
}