| /* |
| * 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.cassandra.tcm.listeners; |
| |
| import java.util.EnumSet; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.tcm.ClusterMetadata; |
| import org.apache.cassandra.tcm.ClusterMetadataService; |
| import org.apache.cassandra.tcm.Transformation; |
| import org.apache.cassandra.tcm.log.Entry; |
| |
| import static org.apache.cassandra.tcm.Transformation.Kind.FORCE_SNAPSHOT; |
| import static org.apache.cassandra.tcm.Transformation.Kind.TRIGGER_SNAPSHOT; |
| |
| public class MetadataSnapshotListener implements LogListener |
| { |
| private static final Logger logger = LoggerFactory.getLogger(MetadataSnapshotListener.class); |
| |
| private static final EnumSet<Transformation.Kind> triggers = EnumSet.of(TRIGGER_SNAPSHOT, FORCE_SNAPSHOT); |
| |
| @Override |
| public void notify(Entry entry, Transformation.Result result) |
| { |
| ClusterMetadata next = result.success().metadata; |
| if (triggers.contains(entry.transform.kind())) |
| { |
| try |
| { |
| ClusterMetadataService.instance().snapshotManager().storeSnapshot(next); |
| } |
| catch (Throwable e) |
| { |
| logger.warn("Unable to serialize metadata snapshot triggered by TriggerSnapshot transformation", e); |
| } |
| } |
| } |
| } |