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/*
* Copyright 2006 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* 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 com.amazon.carbonado;
/**
* An OptimisticLockException is thrown if the {@link Repository} is using
* optimistic locking for concurrency control, and lock aquisition failed.
* This exception may also be thrown if multiversion concurrency control (MVCC)
* is being used and the commit fails.
*
* @author Brian S O'Neill
*/
public class OptimisticLockException extends PersistException {
private static final long serialVersionUID = 4081788711829580886L;
private final transient Storable mStorable;
public OptimisticLockException() {
super();
mStorable = null;
}
public OptimisticLockException(String message) {
super(message);
mStorable = null;
}
public OptimisticLockException(String message, Throwable cause) {
super(message, cause);
mStorable = null;
}
public OptimisticLockException(Throwable cause) {
super(cause);
mStorable = null;
}
/**
* @param expectedVersion version number that was expected for persistent
* record when update was executed
*/
public OptimisticLockException(long expectedVersion) {
this((Long) expectedVersion);
}
/**
* @param expectedVersion version number that was expected for persistent
* record when update was executed
*/
public OptimisticLockException(Object expectedVersion) {
this(expectedVersion, null);
}
/**
* @param expectedVersion version number that was expected for persistent
* record when update was executed
* @param savedVersion actual persistent version number of storable
*/
public OptimisticLockException(Object expectedVersion, Object savedVersion) {
this(expectedVersion, savedVersion, null);
}
/**
* @param expectedVersion version number that was expected for persistent
* record when update was executed
* @param savedVersion actual persistent version number of storable
* @param s Storable which was acted upon
*/
public OptimisticLockException(Object expectedVersion, Object savedVersion, Storable s) {
super(makeMessage(expectedVersion, savedVersion, s));
mStorable = s;
}
/**
* Construct exception for when new version was expected to have increased.
*
* @param savedVersion actual persistent version number of storable
* @param s Storable which was acted upon
* @param newVersion new version which was provided
*/
public OptimisticLockException(Object savedVersion, Storable s, Object newVersion) {
super(makeMessage(savedVersion, s, newVersion));
mStorable = s;
}
/**
* Returns the Storable which was acted upon, or null if not available.
*/
public Storable getStorable() {
return mStorable;
}
private static String makeMessage(Object expectedVersion, Object savedVersion, Storable s) {
String message;
if (expectedVersion == null && savedVersion == null) {
message = null;
} else {
message = "Update acted on version " + expectedVersion +
", but canonical version is " + savedVersion;
}
if (s != null) {
if (message == null) {
message = s.toStringKeyOnly();
} else {
message = message + ": " + s.toStringKeyOnly();
}
}
return message;
}
private static String makeMessage(Object savedVersion, Storable s, Object newVersion) {
String message;
if (savedVersion == null && newVersion == null) {
message = "New version is not larger than existing version";
} else {
message = "New version of " + newVersion +
" is not larger than existing version of " + savedVersion;
}
if (s != null) {
if (message == null) {
message = s.toStringKeyOnly();
} else {
message = message + ": " + s.toStringKeyOnly();
}
}
return message;
}
}
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