| /* |
| * 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 WARRANTIESOR 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.aries.tx.control.service.common.impl; |
| |
| import static java.util.stream.Collectors.toList; |
| import static org.osgi.service.transaction.control.TransactionStatus.NO_TRANSACTION; |
| import static org.osgi.service.transaction.control.TransactionStatus.ROLLED_BACK; |
| |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import org.osgi.service.transaction.control.ScopedWorkException; |
| import org.osgi.service.transaction.control.TransactionBuilder; |
| import org.osgi.service.transaction.control.TransactionContext; |
| import org.osgi.service.transaction.control.TransactionControl; |
| import org.osgi.service.transaction.control.TransactionException; |
| import org.osgi.service.transaction.control.TransactionRolledBackException; |
| |
| public abstract class AbstractTransactionControlImpl implements TransactionControl { |
| |
| private final class TransactionBuilderImpl extends TransactionBuilder { |
| |
| private boolean readOnly = false; |
| |
| @Override |
| public TransactionBuilder readOnly() { |
| readOnly = true; |
| return this; |
| } |
| |
| private void checkValid() { |
| |
| if(closed.get()) { |
| throw new TransactionException("The transaction control service is closed"); |
| } |
| |
| List<Class<? extends Throwable>> duplicates = rollbackFor.stream() |
| .filter(noRollbackFor::contains) |
| .collect(toList()); |
| if(!duplicates.isEmpty()) { |
| throw new TransactionException("The transaction declares that the Exceptions " + |
| duplicates + " must both trigger and not trigger rollback"); |
| } |
| } |
| |
| @Override |
| public <T> T required(Callable<T> work) |
| throws TransactionException, TransactionRolledBackException { |
| checkValid(); |
| |
| boolean endTransaction = false; |
| |
| AbstractTransactionContextImpl existingTran = existingTx.get(); |
| AbstractTransactionContextImpl currentTran; |
| try { |
| if (existingTran == null || existingTran.getTransactionStatus() == NO_TRANSACTION) { |
| currentTran = startTransaction(readOnly); |
| endTransaction = true; |
| existingTx.set(currentTran); |
| } else if (existingTran.isReadOnly() && !readOnly){ |
| throw new TransactionException("A read only transaction is currently active, and cannot be upgraded to a writeable transaction"); |
| } else { |
| currentTran = existingTran; |
| } |
| return doWork(work, currentTran, endTransaction); |
| } finally { |
| existingTx.set(existingTran); |
| } |
| |
| } |
| |
| @Override |
| public <T> T requiresNew(Callable<T> work) |
| throws TransactionException, TransactionRolledBackException { |
| checkValid(); |
| |
| AbstractTransactionContextImpl existingTran = existingTx.get(); |
| try { |
| AbstractTransactionContextImpl currentTran = startTransaction(readOnly); |
| existingTx.set(currentTran); |
| return doWork(work, currentTran, true); |
| } finally { |
| existingTx.set(existingTran); |
| } |
| |
| } |
| |
| @Override |
| public <T> T supports(Callable<T> work) throws TransactionException { |
| checkValid(); |
| |
| boolean endTransaction = false; |
| |
| AbstractTransactionContextImpl existingTran = existingTx.get(); |
| AbstractTransactionContextImpl currentTran; |
| try { |
| if (existingTran == null) { |
| currentTran = new NoTransactionContextImpl(); |
| endTransaction = true; |
| existingTx.set(currentTran); |
| } else { |
| currentTran = existingTran; |
| } |
| return doWork(work, currentTran, endTransaction); |
| } finally { |
| existingTx.set(existingTran); |
| } |
| |
| } |
| |
| @Override |
| public <T> T notSupported(Callable<T> work) |
| throws TransactionException { |
| checkValid(); |
| |
| boolean endTransaction = false; |
| |
| AbstractTransactionContextImpl existingTran = existingTx.get(); |
| AbstractTransactionContextImpl currentTran; |
| |
| try { |
| if (existingTran == null || existingTran.getTransactionStatus() != NO_TRANSACTION) { |
| // We must create a new coordination to scope our new |
| // transaction |
| currentTran = new NoTransactionContextImpl(); |
| endTransaction = true; |
| existingTx.set(currentTran); |
| } else { |
| currentTran = existingTran; |
| } |
| return doWork(work, currentTran, endTransaction); |
| } finally { |
| existingTx.set(existingTran); |
| } |
| } |
| |
| private <R> R doWork(Callable<R> transactionalWork, |
| AbstractTransactionContextImpl currentTran, |
| boolean endTransaction) { |
| R result; |
| try { |
| result = transactionalWork.call(); |
| |
| } catch (Throwable t) { |
| //TODO handle noRollbackFor |
| if(requiresRollback(t)) { |
| currentTran.safeSetRollbackOnly(); |
| } |
| if(endTransaction) { |
| try { |
| currentTran.finish(); |
| } catch (Exception e) { |
| currentTran.recordFailure(e); |
| } |
| } |
| |
| TransactionContext toPropagate = endTransaction ? null : currentTran; |
| |
| ScopedWorkException workException; |
| |
| if(t instanceof ScopedWorkException) { |
| workException = new ScopedWorkException("A nested piece of scoped work threw an exception", |
| t.getCause(), toPropagate); |
| workException.addSuppressed(t); |
| } else { |
| workException = new ScopedWorkException("The scoped work threw an exception", |
| t, toPropagate); |
| } |
| |
| Throwable throwable = currentTran.firstUnexpectedException.get(); |
| if(throwable != null) { |
| workException.addSuppressed(throwable); |
| } |
| currentTran.subsequentExceptions.stream().forEach(workException::addSuppressed); |
| |
| throw workException; |
| } |
| |
| if(endTransaction) { |
| try { |
| currentTran.finish(); |
| } catch (Exception e) { |
| currentTran.recordFailure(e); |
| } |
| } |
| |
| Throwable throwable = currentTran.firstUnexpectedException.get(); |
| if(throwable != null) { |
| TransactionException te = currentTran.getTransactionStatus() == ROLLED_BACK ? |
| new TransactionRolledBackException("The transaction rolled back due to a failure", throwable) : |
| new TransactionException("There was an error in the Transaction completion.", throwable); |
| |
| currentTran.subsequentExceptions.stream().forEach(te::addSuppressed); |
| |
| throw te; |
| } |
| |
| return result; |
| } |
| |
| private boolean requiresRollback(Throwable t) { |
| return mostSpecificMatch(noRollbackFor, t) |
| .map(noRollbackType -> mostSpecificMatch(rollbackFor, t) |
| .map(rollbackType -> noRollbackType.isAssignableFrom(rollbackType)) |
| .orElse(false)) |
| .orElse(true); |
| } |
| |
| private Optional<Class<? extends Throwable>> mostSpecificMatch(Collection<Class<? extends Throwable>> types, Throwable t) { |
| return types.stream() |
| .filter(c -> c.isInstance(t)) |
| .max((c1, c2) -> { |
| if(c1 == c2) return 0; |
| |
| return c1.isAssignableFrom(c2) ? 1 : c2.isAssignableFrom(c1) ? -1 : 0; |
| }); |
| } |
| } |
| |
| private final ThreadLocal<AbstractTransactionContextImpl> existingTx = new ThreadLocal<>(); |
| |
| private final AtomicBoolean closed = new AtomicBoolean(); |
| |
| protected abstract AbstractTransactionContextImpl startTransaction(boolean readOnly); |
| |
| @Override |
| public TransactionBuilder build() { |
| return new TransactionBuilderImpl(); |
| } |
| |
| @Override |
| public boolean getRollbackOnly() throws IllegalStateException { |
| return getCurrentTranContextChecked().getRollbackOnly(); |
| } |
| |
| @Override |
| public void setRollbackOnly() throws IllegalStateException { |
| getCurrentTranContextChecked().setRollbackOnly(); |
| } |
| |
| @Override |
| public <T> T required(Callable<T> work) |
| throws TransactionException, TransactionRolledBackException { |
| return build().required(work); |
| } |
| |
| @Override |
| public <T> T requiresNew(Callable<T> work) |
| throws TransactionException, TransactionRolledBackException { |
| return build().requiresNew(work); |
| } |
| |
| @Override |
| public <T> T notSupported(Callable<T> work) throws TransactionException { |
| return build().notSupported(work); |
| } |
| |
| @Override |
| public <T> T supports(Callable<T> work) throws TransactionException { |
| return build().supports(work); |
| } |
| |
| @Override |
| public boolean activeTransaction() { |
| TransactionContext context = getCurrentContext(); |
| return context != null |
| && context.getTransactionStatus() != NO_TRANSACTION; |
| } |
| |
| @Override |
| public boolean activeScope() { |
| return getCurrentContext() != null; |
| } |
| |
| private TransactionContext getCurrentTranContextChecked() { |
| TransactionContext toUse = getCurrentContext(); |
| if (toUse == null) { |
| throw new IllegalStateException( |
| "There is no applicable transaction context"); |
| } |
| return toUse; |
| } |
| |
| @Override |
| public TransactionContext getCurrentContext() { |
| return existingTx.get(); |
| } |
| |
| @Override |
| public void ignoreException(Throwable t) throws IllegalStateException { |
| // TODO Auto-generated method stub |
| |
| } |
| |
| public void close() { |
| closed.set(true); |
| } |
| } |