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Added support for COM_BINLOG_DUMP_GTID (resolves #41)
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src/main/java/com/github/shyiko/mysql/binlog/GtidSet.java
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| /* | ||
| * Copyright 2015 Stanley Shyiko | ||
| * | ||
| * 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.github.shyiko.mysql.binlog; | ||
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| import java.util.*; | ||
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| /** | ||
| * GTID set as described in <a href="https://dev.mysql.com/doc/refman/5.6/en/replication-gtids-concepts.html">GTID Concepts</a> | ||
| * of MySQL 5.6 Reference Manual. | ||
| * | ||
| * <pre> | ||
| * gtid_set: uuid_set[,uuid_set]... | ||
| * uuid_set: uuid:interval[:interval]... | ||
| * uuid: hhhhhhhh-hhhh-hhhh-hhhh-hhhhhhhhhhhh, h: [0-9|A-F] | ||
| * interval: n[-n], (n >= 1) | ||
| * </pre> | ||
| * | ||
| * @author <a href="mailto:stanley.shyiko@gmail.com">Stanley Shyiko</a> | ||
| */ | ||
| public class GtidSet { | ||
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| private final Map<String, UUIDSet> map = new LinkedHashMap<String, UUIDSet>(); | ||
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| public GtidSet(String gtidSet) { | ||
| String[] uuidSets = gtidSet.isEmpty() ? new String[0] : gtidSet.split(","); | ||
| for (String uuidSet : uuidSets) { | ||
| int uuidSeparatorIndex = uuidSet.indexOf(":"); | ||
| String sourceId = uuidSet.substring(0, uuidSeparatorIndex); | ||
| List<Interval> intervals = new ArrayList<Interval>(); | ||
| String[] rawIntervals = uuidSet.substring(uuidSeparatorIndex + 1).split(":"); | ||
| for (String interval : rawIntervals) { | ||
| String[] is = interval.split("-"); | ||
| long[] split = new long[is.length]; | ||
| for (int i = 0, e = is.length; i < e; i++) { | ||
| split[i] = Long.parseLong(is[i]); | ||
| } | ||
| if (split.length == 1) { | ||
| split = new long[] {split[0], split[0] + 1}; | ||
| } | ||
| intervals.add(new Interval(split[0], split[1])); | ||
| } | ||
| map.put(sourceId, new UUIDSet(sourceId, intervals)); | ||
| } | ||
| } | ||
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| public Collection<UUIDSet> getUUIDSets() { | ||
| return map.values(); | ||
| } | ||
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| /** | ||
| * @param gtid GTID ("source_id:transaction_id") | ||
| * @return whether or not gtid was added to the set (false if it was already there) | ||
| */ | ||
| public boolean add(String gtid) { | ||
| String[] split = gtid.split(":"); | ||
| String sourceId = split[0]; | ||
| long transactionId = Long.parseLong(split[1]); | ||
| UUIDSet uuidSet = map.get(sourceId); | ||
| if (uuidSet == null) { | ||
| map.put(sourceId, uuidSet = new UUIDSet(sourceId, new ArrayList<Interval>())); | ||
| } | ||
| List<Interval> intervals = (List<Interval>) uuidSet.intervals; | ||
| int index = findInterval(intervals, transactionId); | ||
| boolean addedToExisting = false; | ||
| if (index < intervals.size()) { | ||
| Interval interval = intervals.get(index); | ||
| if (interval.getStart() == transactionId + 1) { | ||
| interval.start = transactionId; | ||
| addedToExisting = true; | ||
| } else | ||
| if (interval.getEnd() == transactionId) { | ||
| interval.end = transactionId + 1; | ||
| addedToExisting = true; | ||
| } else | ||
| if (interval.getStart() <= transactionId && transactionId < interval.getEnd()) { | ||
| return false; | ||
| } | ||
| } | ||
| if (!addedToExisting) { | ||
| intervals.add(index, new Interval(transactionId, transactionId + 1)); | ||
| } | ||
| if (intervals.size() > 1) { | ||
| joinAdjacentIntervals(intervals, index); | ||
| } | ||
| return true; | ||
| } | ||
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| /** | ||
| * Collapses intervals like a-b:b-c into a-c (only in index+-1 range). | ||
| */ | ||
| private void joinAdjacentIntervals(List<Interval> intervals, int index) { | ||
| for (int i = Math.min(index + 1, intervals.size() - 1), e = Math.max(index - 1, 0); i > e; i--) { | ||
| Interval a = intervals.get(i - 1), b = intervals.get(i); | ||
| if (a.getEnd() == b.getStart()) { | ||
| a.end = b.end; | ||
| intervals.remove(i); | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| List<String> gtids = new ArrayList<String>(); | ||
| for (UUIDSet uuidSet : map.values()) { | ||
| gtids.add(uuidSet.getUUID() + ":" + join(uuidSet.intervals, ":")); | ||
| } | ||
| return join(gtids, ","); | ||
| } | ||
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| /** | ||
| * @return index which is either a pointer to the interval containing v or a position at which v can be added | ||
| */ | ||
| private static int findInterval(List<Interval> ii, long v) { | ||
| int l = 0, p = 0, r = ii.size(); | ||
| while (l < r) { | ||
| p = (l + r) / 2; | ||
| Interval i = ii.get(p); | ||
| if (i.getEnd() < v) { | ||
| l = p + 1; | ||
| } else | ||
| if (v < i.getStart()) { | ||
| r = p; | ||
| } else { | ||
| return p; | ||
| } | ||
| } | ||
| if (!ii.isEmpty() && ii.get(p).getEnd() < v) { | ||
| p++; | ||
| } | ||
| return p; | ||
| } | ||
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| private String join(Collection o, String delimiter) { | ||
| if (o.isEmpty()) { | ||
| return ""; | ||
| } | ||
| StringBuilder sb = new StringBuilder(); | ||
| for (Object o1 : o) { | ||
| sb.append(o1).append(delimiter); | ||
| } | ||
| return sb.substring(0, sb.length() - delimiter.length()); | ||
| } | ||
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| public static class UUIDSet { | ||
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| private String uuid; | ||
| private Collection<Interval> intervals; | ||
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| public UUIDSet(String uuid, Collection<Interval> intervals) { | ||
| this.uuid = uuid; | ||
| this.intervals = intervals; | ||
| } | ||
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| public String getUUID() { | ||
| return uuid; | ||
| } | ||
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| public Collection<Interval> getIntervals() { | ||
| return intervals; | ||
| } | ||
| } | ||
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| public static class Interval implements Comparable<Interval> { | ||
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| private long start; | ||
| private long end; | ||
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| public Interval(long start, long end) { | ||
| this.start = start; | ||
| this.end = end; | ||
| } | ||
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| public long getStart() { | ||
| return start; | ||
| } | ||
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| public long getEnd() { | ||
| return end; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return start + "-" + end; | ||
| } | ||
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| @Override | ||
| public int compareTo(Interval o) { | ||
| return saturatedCast(this.start - o.start); | ||
| } | ||
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| private static int saturatedCast(long value) { | ||
| if (value > Integer.MAX_VALUE) { | ||
| return Integer.MAX_VALUE; | ||
| } | ||
| if (value < Integer.MIN_VALUE) { | ||
| return Integer.MIN_VALUE; | ||
| } | ||
| return (int) value; | ||
| } | ||
| } | ||
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| } |
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