| /* |
| * 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.ignite.igfs; |
| |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * {@code IGFS} mode defining interactions with underlying secondary Hadoop file system. |
| * Secondary Hadoop file system is provided for pass-through, write-through, and |
| * read-through purposes. |
| * <p> |
| * This mode is configured via {@link org.apache.ignite.configuration.FileSystemConfiguration#getDefaultMode()} |
| * configuration property. |
| */ |
| public enum IgfsMode { |
| /** |
| * In this mode IGFS will not delegate to secondary Hadoop file system and will |
| * cache all the files in memory only. |
| */ |
| PRIMARY, |
| |
| /** |
| * In this mode IGFS will not cache any files in memory and will only pass them |
| * through to secondary Hadoop file system. If this mode is enabled, then |
| * secondary Hadoop file system must be configured. |
| * |
| * @see org.apache.ignite.configuration.FileSystemConfiguration#getSecondaryFileSystem() |
| */ |
| PROXY, |
| |
| /** |
| * In this mode {@code IGFS} will cache files locally and also <i>synchronously</i> |
| * write them through to secondary Hadoop file system. |
| * <p> |
| * If secondary Hadoop file system is not configured, then this mode behaves like |
| * {@link #PRIMARY} mode. |
| * |
| * @see org.apache.ignite.configuration.FileSystemConfiguration#getSecondaryFileSystem() |
| */ |
| DUAL_SYNC, |
| |
| /** |
| * In this mode {@code IGFS} will cache files locally and also <i>asynchronously</i> |
| * write them through to secondary Hadoop file system. |
| * <p> |
| * If secondary Hadoop file system is not configured, then this mode behaves like |
| * {@link #PRIMARY} mode. |
| * |
| * @see org.apache.ignite.configuration.FileSystemConfiguration#getSecondaryFileSystem() |
| */ |
| DUAL_ASYNC; |
| |
| /** Enumerated values. */ |
| private static final IgfsMode[] VALS = values(); |
| |
| /** |
| * Efficiently gets enumerated value from its ordinal. |
| * |
| * @param ord Ordinal value. |
| * @return Enumerated value or {@code null} if ordinal out of range. |
| */ |
| @Nullable public static IgfsMode fromOrdinal(int ord) { |
| return ord >= 0 && ord < VALS.length ? VALS[ord] : null; |
| } |
| } |