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  * Copyright (c) 2011. Axon Framework
  * Licensed 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.axonframework.eventhandling;
Concurrency policy that requires sequential processing of events raised by the same aggregate. Events from different aggregates may be processed in different threads, as will events that do not extend the DomainEvent type.

Allard Buijze
public class SequentialPerAggregatePolicy implements SequencingPolicy<Event> {

    public Object getSequenceIdentifierFor(Event event) {
        if (DomainEvent.class.isInstance(event)) {
            return ((DomainEventevent).getAggregateIdentifier();
        return null;
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