| /** |
| * 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 com.twitter.distributedlog; |
| |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| |
| import com.google.common.collect.ImmutableList; |
| import org.apache.zookeeper.ZooDefs.Ids; |
| import org.apache.zookeeper.data.ACL; |
| |
| import static com.google.common.base.Charsets.UTF_8; |
| |
| public class DistributedLogConstants { |
| public static final byte[] EMPTY_BYTES = new byte[0]; |
| public static final String SCHEME_PREFIX = "distributedlog"; |
| public static final String BACKEND_BK = "bk"; |
| public static final long INVALID_TXID = -999; |
| public static final long EMPTY_LOGSEGMENT_TX_ID = -99; |
| public static final long MAX_TXID = Long.MAX_VALUE; |
| public static final long SMALL_LOGSEGMENT_THRESHOLD = 10; |
| public static final int LOGSEGMENT_NAME_VERSION = 1; |
| public static final int FUTURE_TIMEOUT_IMMEDIATE = 0; |
| public static final int FUTURE_TIMEOUT_INFINITE = -1; |
| public static final long LOCK_IMMEDIATE = FUTURE_TIMEOUT_IMMEDIATE; |
| public static final long LOCK_TIMEOUT_INFINITE = FUTURE_TIMEOUT_INFINITE; |
| public static final long LOCK_OP_TIMEOUT_DEFAULT = 120; |
| public static final long LOCK_REACQUIRE_TIMEOUT_DEFAULT = 120; |
| public static final String UNKNOWN_CLIENT_ID = "Unknown-ClientId"; |
| public static final int LOCAL_REGION_ID = 0; |
| public static final long LOGSEGMENT_DEFAULT_STATUS = 0; |
| public static final long UNASSIGNED_LOGSEGMENT_SEQNO = 0; |
| public static final long UNASSIGNED_SEQUENCE_ID = -1L; |
| public static final long FIRST_LOGSEGMENT_SEQNO = 1; |
| public static final long UNRESOLVED_LEDGER_ID = -1; |
| public static final long LATENCY_WARN_THRESHOLD_IN_MILLIS = TimeUnit.SECONDS.toMillis(1); |
| public static final int DL_INTERRUPTED_EXCEPTION_RESULT_CODE = Integer.MIN_VALUE + 1; |
| public static final int ZK_CONNECTION_EXCEPTION_RESULT_CODE = Integer.MIN_VALUE + 2; |
| |
| public static final String ALLOCATION_POOL_NODE = ".allocation_pool"; |
| // log segment prefix |
| public static final String INPROGRESS_LOGSEGMENT_PREFIX = "inprogress"; |
| public static final String COMPLETED_LOGSEGMENT_PREFIX = "logrecs"; |
| public static final String DISALLOW_PLACEMENT_IN_REGION_FEATURE_NAME = "disallow_bookie_placement"; |
| static final byte[] CONTROL_RECORD_CONTENT = "control".getBytes(UTF_8); |
| public static final byte[] KEEPALIVE_RECORD_CONTENT = "keepalive".getBytes(UTF_8); |
| |
| // An ACL that gives all permissions to node creators and read permissions only to everyone else. |
| public static final List<ACL> EVERYONE_READ_CREATOR_ALL = |
| ImmutableList.<ACL>builder() |
| .addAll(Ids.CREATOR_ALL_ACL) |
| .addAll(Ids.READ_ACL_UNSAFE) |
| .build(); |
| } |