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apacheGH-3026: spatial index per graph and kryo serialization
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| /* | ||
| * 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.system; | ||
|
|
||
| import java.util.Objects; | ||
|
|
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| import org.apache.jena.query.ReadWrite; | ||
| import org.apache.jena.query.TxnType; | ||
| import org.apache.jena.sparql.core.Transactional; | ||
|
|
||
| /** | ||
| * Txn variant for use with try-with-resources. Allows raising | ||
| * checked exceptions in an idiomatic way. Closing the TxnCtl | ||
| * instance will abort the transaction unless it | ||
| * has been manually committed. | ||
| * <p> | ||
| * | ||
| * Usage example: | ||
| * <pre> | ||
| * public void myMethod() throws IOException { | ||
| * try (TxnCtl txn = TxnCtl.begin(dataset, TxnType.WRITE)) { | ||
| * // Do work | ||
| * if (someError) { | ||
| * throw new IOException(); | ||
| * } | ||
| * // Must manually call commit on success. | ||
| * txn.commit(); | ||
| * } | ||
| * } | ||
| * </pre> | ||
| */ | ||
| public class TxnCtl | ||
| implements AutoCloseable | ||
| { | ||
| private Transactional txn; | ||
| private boolean b; | ||
|
|
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| private TxnCtl(Transactional txn, boolean b) { | ||
| super(); | ||
| this.txn = txn; | ||
| this.b = b; | ||
| } | ||
|
|
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| public static TxnCtl begin(Transactional txn, ReadWrite readWrite) { | ||
| return begin(txn, TxnType.convert(readWrite)); | ||
| } | ||
|
|
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| public static TxnCtl begin(Transactional txn, TxnType txnType) { | ||
| Objects.requireNonNull(txn); | ||
| Objects.requireNonNull(txnType); | ||
| boolean b = txn.isInTransaction(); | ||
| if ( b ) | ||
| TxnOp.compatibleWithPromote(txnType, txn); | ||
| else | ||
| txn.begin(txnType); | ||
| return new TxnCtl(txn, b); | ||
| } | ||
|
|
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| public void commit() { | ||
| if ( txn.isInTransaction() ) { | ||
|
|
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| // May have been explicit commit or abort. | ||
| txn.commit(); | ||
| } | ||
| } | ||
|
|
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| @Override | ||
| public void close() { | ||
| if ( !b ) { | ||
| if ( txn.isInTransaction() ) | ||
| // May have been explicit commit or abort. | ||
| txn.abort(); | ||
| txn.end(); | ||
| } | ||
| } | ||
| } |
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