| /* |
| * 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.config; |
| |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.Set; |
| import java.util.UUID; |
| |
| import com.google.common.collect.ImmutableSet; |
| |
| public final class SchemaConstants |
| { |
| public static final String SYSTEM_KEYSPACE_NAME = "system"; |
| public static final String SCHEMA_KEYSPACE_NAME = "system_schema"; |
| |
| public static final String TRACE_KEYSPACE_NAME = "system_traces"; |
| public static final String AUTH_KEYSPACE_NAME = "system_auth"; |
| public static final String DISTRIBUTED_KEYSPACE_NAME = "system_distributed"; |
| |
| /* system keyspace names (the ones with LocalStrategy replication strategy) */ |
| public static final Set<String> SYSTEM_KEYSPACE_NAMES = ImmutableSet.of(SYSTEM_KEYSPACE_NAME, SCHEMA_KEYSPACE_NAME); |
| |
| /* replicate system keyspace names (the ones with a "true" replication strategy) */ |
| public static final Set<String> REPLICATED_SYSTEM_KEYSPACE_NAMES = ImmutableSet.of(TRACE_KEYSPACE_NAME, |
| AUTH_KEYSPACE_NAME, |
| DISTRIBUTED_KEYSPACE_NAME); |
| /** |
| * longest permissible KS or CF name. Our main concern is that filename not be more than 255 characters; |
| * the filename will contain both the KS and CF names. Since non-schema-name components only take up |
| * ~64 characters, we could allow longer names than this, but on Windows, the entire path should be not greater than |
| * 255 characters, so a lower limit here helps avoid problems. See CASSANDRA-4110. |
| */ |
| public static final int NAME_LENGTH = 48; |
| |
| // 59adb24e-f3cd-3e02-97f0-5b395827453f |
| public static final UUID emptyVersion; |
| |
| static |
| { |
| try |
| { |
| emptyVersion = UUID.nameUUIDFromBytes(MessageDigest.getInstance("MD5").digest()); |
| } |
| catch (NoSuchAlgorithmException e) |
| { |
| throw new AssertionError(); |
| } |
| } |
| |
| /** |
| * @return whether or not the keyspace is a really system one (w/ LocalStrategy, unmodifiable, hardcoded) |
| */ |
| public static boolean isSystemKeyspace(String keyspaceName) |
| { |
| return SYSTEM_KEYSPACE_NAMES.contains(keyspaceName.toLowerCase()); |
| } |
| } |