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//   Copyright 2012,2013 Vaughn Vernon
//
//   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
//
//       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 io.dddspring.common.domain.model;

public class ConcurrencySafeEntity extends Entity {

    private static final long serialVersionUID = 1L;

    private int concurrencyVersion;

    protected ConcurrencySafeEntity() {
        super();
    }

    public int concurrencyVersion() {
        return this.concurrencyVersion;
    }

    public void setConcurrencyVersion(int aVersion) {
        this.failWhenConcurrencyViolation(aVersion);
        this.concurrencyVersion = aVersion;
    }

    public void failWhenConcurrencyViolation(int aVersion) {
        if (aVersion != this.concurrencyVersion()) {
            throw new IllegalStateException(
                    "Concurrency Violation: Stale data detected. Entity was already modified.");
        }
    }
}