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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to you under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    * http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.hadoop.hbase.quotas.policies;
18  
19  import org.apache.hadoop.hbase.classification.InterfaceAudience;
20  import org.apache.hadoop.hbase.client.Append;
21  import org.apache.hadoop.hbase.client.Increment;
22  import org.apache.hadoop.hbase.client.Mutation;
23  import org.apache.hadoop.hbase.client.Put;
24  import org.apache.hadoop.hbase.quotas.SpaceLimitingException;
25  import org.apache.hadoop.hbase.quotas.SpaceViolationPolicy;
26  import org.apache.hadoop.hbase.quotas.SpaceViolationPolicyEnforcement;
27  
28  /**
29   * A {@link SpaceViolationPolicyEnforcement} which disallows any inserts to the table. The
30   * enforcement counterpart to {@link SpaceViolationPolicy#NO_INSERTS}.
31   */
32  @InterfaceAudience.Private
33  public class NoInsertsViolationPolicyEnforcement extends DefaultViolationPolicyEnforcement {
34  
35    @Override
36    public void enable() {}
37  
38    @Override
39    public void disable() {}
40  
41    @Override
42    public void check(Mutation m) throws SpaceLimitingException {
43      // Disallow all "new" data flowing into HBase, but allow Deletes (even though we know they will
44      // temporarily increase utilization).
45      if (m instanceof Append  || m instanceof Increment || m instanceof Put) {
46        throw new SpaceLimitingException(getPolicyName(),
47            m.getClass().getSimpleName() + "s are disallowed due to a space quota.");
48      }
49    }
50  
51    @Override
52    public String getPolicyName() {
53      return SpaceViolationPolicy.NO_INSERTS.name();
54    }
55  }