/**
* 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.camel.util;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.camel.Exchange;
import org.apache.camel.impl.DefaultUnitOfWork;
import org.apache.camel.impl.MDCUnitOfWork;
import org.apache.camel.spi.Synchronization;
import org.apache.camel.spi.UnitOfWork;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @version
*/
public final class UnitOfWorkHelper {
private static final Logger LOG = LoggerFactory.getLogger(UnitOfWorkHelper.class);
private UnitOfWorkHelper() {
}
/**
* Creates a new {@link UnitOfWork}.
*
* @param exchange the exchange
* @return the created unit of work (is not started)
*/
public static UnitOfWork createUoW(Exchange exchange) {
UnitOfWork answer;
if (exchange.getContext().isUseMDCLogging()) {
answer = new MDCUnitOfWork(exchange);
} else {
answer = new DefaultUnitOfWork(exchange);
}
return answer;
}
/**
* Done and stop the {@link UnitOfWork}.
*
* @param uow the unit of work
* @param exchange the exchange (will unset the UoW on the exchange)
*/
public static void doneUow(UnitOfWork uow, Exchange exchange) {
// unit of work is done
try {
if (uow != null) {
uow.done(exchange);
}
} catch (Throwable e) {
LOG.warn("Exception occurred during done UnitOfWork for Exchange: " + exchange
+ ". This exception will be ignored.", e);
}
try {
if (uow != null) {
uow.stop();
}
} catch (Throwable e) {
LOG.warn("Exception occurred during stopping UnitOfWork for Exchange: " + exchange
+ ". This exception will be ignored.", e);
}
// remove uow from exchange as its done
exchange.setUnitOfWork(null);
}
public static void doneSynchronizations(Exchange exchange, List<Synchronization> synchronizations, Logger log) {
boolean failed = exchange.isFailed();
if (synchronizations != null && !synchronizations.isEmpty()) {
// work on a copy of the list to avoid any modification which may cause ConcurrentModificationException
List<Synchronization> copy = new ArrayList<Synchronization>(synchronizations);
// reverse so we invoke it FILO style instead of FIFO
Collections.reverse(copy);
// and honor if any was ordered by sorting it accordingly
Collections.sort(copy, new OrderedComparator());
// invoke synchronization callbacks
for (Synchronization synchronization : copy) {
try {
if (failed) {
log.trace("Invoking synchronization.onFailure: {} with {}", synchronization, exchange);
synchronization.onFailure(exchange);
} else {
log.trace("Invoking synchronization.onComplete: {} with {}", synchronization, exchange);
synchronization.onComplete(exchange);
}
} catch (Throwable e) {
// must catch exceptions to ensure all synchronizations have a chance to run
log.warn("Exception occurred during onCompletion. This exception will be ignored.", e);
}
}
}
}
}