/* * Copyright 2006-2012 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; import java.lang.annotation.*; /** * Indicates that all accesses to this {@link Storable} must come from an * authoritative source. When reading or writing the Storable, the {@link * Repository} must guarantee that it is operating on the latest, correct * version of the Storable. * *

Repositories that cache potentially stale Storables are required to * ensure the cache is always up-to-date or bypass the cache * altogether. Replicating repositories which may have a propagation delay must * always access the master repository. * *

Repositories which provide eventual consistency but don't rely on a * master must throw {@link UnsupportedTypeException}, as there is no * authoritative source. * *

Example:

 * @Authoritative
 * @PrimaryKey("sequenceName")
 * public interface SequenceValue extends Storable<SequenceValue> {
 *     String getSequenceName();
 *     void setSequenceName(String name);
 *
 *     long getNextValue();
 *     void setNextValue(long value);
 *
 *     ...
 * }
 * 
* * @author Brian S O'Neill */ @Documented @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.TYPE) public @interface Authoritative { }