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46 lines
2 KiB
Java
46 lines
2 KiB
Java
// Copyright 2016 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.model.common;
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import com.googlecode.objectify.Key;
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import com.googlecode.objectify.annotation.Entity;
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import com.googlecode.objectify.annotation.Id;
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import google.registry.model.BackupGroupRoot;
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/**
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* The root key for the entity group which is known as the cross-tld entity group for historical
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* reasons.
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*
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* <p>This exists as a storage place for common configuration options and global settings that
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* aren't updated too frequently. Entities in this entity group are usually cached upon load. The
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* reason this common entity group exists is because it enables strongly consistent queries and
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* updates across this seldomly updated data. This shared entity group also helps cut down on
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* a potential ballooning in the number of entity groups enlisted in transactions.
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*
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* <p>Historically, each TLD used to have a separate namespace, and all entities for a TLD were in
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* a single EntityGroupRoot for that TLD. Hence why there was a "cross-tld" entity group -- it was
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* the entity group for the single namespace where global data applicable for all TLDs lived.
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*/
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@Entity
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public class EntityGroupRoot extends BackupGroupRoot {
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@Id
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private String id;
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/** The root key for cross-tld resources such as registrars. */
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public static final Key<EntityGroupRoot> getCrossTldKey() {
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return Key.create(EntityGroupRoot.class, "cross-tld");
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}
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}
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