| /* |
| * 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.tserver; |
| |
| import java.util.SortedMap; |
| import java.util.TreeMap; |
| |
| import org.apache.accumulo.core.dataImpl.KeyExtent; |
| import org.apache.accumulo.tserver.tablet.Tablet; |
| |
| import com.google.common.collect.ImmutableSortedMap; |
| |
| /* |
| * The set of online tablets is frequently read by many threads and infrequently updated. This |
| * class exists to create a simple wrapper that keeps an immutable snapshot up to date. Many |
| * threads can access the snapshot without interfering with each other. |
| */ |
| public class OnlineTablets { |
| private volatile ImmutableSortedMap<KeyExtent,Tablet> snapshot = ImmutableSortedMap.of(); |
| private final SortedMap<KeyExtent,Tablet> onlineTablets = new TreeMap<>(); |
| |
| public synchronized void put(KeyExtent ke, Tablet t) { |
| onlineTablets.put(ke, t); |
| snapshot = ImmutableSortedMap.copyOf(onlineTablets); |
| } |
| |
| public synchronized void remove(KeyExtent ke) { |
| onlineTablets.remove(ke); |
| snapshot = ImmutableSortedMap.copyOf(onlineTablets); |
| } |
| |
| public synchronized void split(KeyExtent oldTablet, Tablet newTablet1, Tablet newTablet2) { |
| onlineTablets.remove(oldTablet); |
| onlineTablets.put(newTablet1.getExtent(), newTablet1); |
| onlineTablets.put(newTablet2.getExtent(), newTablet2); |
| snapshot = ImmutableSortedMap.copyOf(onlineTablets); |
| } |
| |
| ImmutableSortedMap<KeyExtent,Tablet> snapshot() { |
| return snapshot; |
| } |
| } |