/*
* 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.flume.channel.file;
import java.io.IOException;
import com.google.common.collect.ImmutableSortedSet;
abstract class EventQueueBackingStore {
protected static final int EMPTY = 0;
private int queueSize;
private int queueHead;
private long logWriteOrderID;
private final int capacity;
private final String name;
public static final String BACKUP_COMPLETE_FILENAME = "backupComplete";
protected Boolean slowdownBackup = false;
protected EventQueueBackingStore(int capacity, String name) {
this.capacity = capacity;
this.name = name;
}
abstract void beginCheckpoint() throws IOException;
abstract void checkpoint() throws IOException;
abstract void incrementFileID(int fileID);
abstract void decrementFileID(int fileID);
abstract ImmutableSortedSet<Integer> getReferenceCounts();
abstract long get(int index);
abstract void put(int index, long value);
abstract boolean syncRequired();
abstract void close() throws IOException;
protected abstract int getVersion();
int getSize() {
return queueSize;
}
void setSize(int size) {
queueSize = size;
}
int getHead() {
return queueHead;
}
void setHead(int head) {
queueHead = head;
}
int getCapacity() {
return capacity;
}
String getName() {
return name;
}
protected void setLogWriteOrderID(long logWriteOrderID) {
this.logWriteOrderID = logWriteOrderID;
}
long getLogWriteOrderID() {
return logWriteOrderID;
}
}