PersistentOfflineTopicStats.java

/**
 * Copyright 2016 Yahoo Inc.
 *
 * Licensed 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.yahoo.pulsar.common.policies.data;

import java.util.Date;
import java.util.List;
import java.util.Map;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

/**
 * This object is populated using meta data in zookeeper without actually bringing the topic online
 */
public class PersistentOfflineTopicStats {
    /** Space used to store the messages for the topic. bytes */
    public long storageSize;

    /** Total number of messages */
    public long totalMessages;

    /** Total backlog */
    public long messageBacklog;

    /** Broker host where this stat was generated */
    public final String brokerName;

    /** offline topic name */
    public final String topicName;

    /** data ledger ids */
    public List<LedgerDetails> dataLedgerDetails;

    /** cursor ledger ids and backlog */
    public Map<String, CursorDetails> cursorDetails;

    /** timestamp when stat was generated */
    public Date statGeneratedAt;

    public PersistentOfflineTopicStats(String topicName, String brokerName) {
        this.brokerName = brokerName;
        this.topicName = topicName;
        this.dataLedgerDetails = Lists.newArrayList();
        this.cursorDetails = Maps.newHashMap();
        this.statGeneratedAt = new Date(System.currentTimeMillis());
    }

    public void reset() {
        this.storageSize = 0;
        this.totalMessages = 0;
        this.messageBacklog = 0;
        this.dataLedgerDetails.clear();
        this.cursorDetails.clear();
        this.statGeneratedAt.setTime(System.currentTimeMillis());
    }

    public class CursorDetails {
        public long cursorBacklog;
        public long cursorLedgerId;

        public CursorDetails(long cursorBacklog, long cursorLedgerId) {
            this.cursorBacklog = cursorBacklog;
            this.cursorLedgerId = cursorLedgerId;
        }
    }

    public void addCursorDetails(String cursor, long backlog, long ledgerId) {
        this.cursorDetails.put(cursor, new CursorDetails(backlog, ledgerId));
    }

    public void addLedgerDetails(long entries, long timestamp, long size, long ledgerId) {
        this.dataLedgerDetails.add(new LedgerDetails(entries, timestamp, size, ledgerId));
    }

    public class LedgerDetails {
        public long entries;
        public long timestamp;
        public long size;
        public long ledgerId;

        public LedgerDetails(long entries, long timestamp, long size, long ledgerId) {
            this.entries = entries;
            this.timestamp = timestamp;
            this.size = size;
            this.ledgerId = ledgerId;
        }
    }
}