| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.accumulo.examples.simple.constraints; |
| |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.accumulo.core.constraints.Constraint; |
| import org.apache.accumulo.core.data.Mutation; |
| |
| /** |
| * Ensure that mutations are a reasonable size: we must be able to fit several in memory at a time. |
| * |
| */ |
| public class MaxMutationSize implements Constraint { |
| static final long MAX_SIZE = Runtime.getRuntime().maxMemory() >> 8; |
| static final List<Short> empty = Collections.emptyList(); |
| static final List<Short> violations = Collections.singletonList(Short.valueOf((short) 0)); |
| |
| @Override |
| public String getViolationDescription(short violationCode) { |
| return String.format("mutation exceeded maximum size of %d", MAX_SIZE); |
| } |
| |
| @Override |
| public List<Short> check(Environment env, Mutation mutation) { |
| if (mutation.estimatedMemoryUsed() < MAX_SIZE) |
| return empty; |
| return violations; |
| } |
| } |