1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.documentapi.messagebus.protocol;
import com.yahoo.collections.Tuple2;
import com.yahoo.messagebus.EmptyReply;
import com.yahoo.messagebus.Error;
import com.yahoo.messagebus.Reply;
/**
* Encapsulated logic for merging replies from 1-n related DocumentProtocol messages.
* For internal use only. Not multithread safe.
*/
final class ReplyMerger {
private Reply successReply = null;
private int successIndex = -1;
private Reply error = null;
private Reply ignore = null;
public void merge(int i, Reply r) {
if (r.hasErrors()) {
mergeAllReplyErrors(r);
} else {
updateStateWithSuccessfulReply(i, r);
}
}
private boolean resourceWasFound(Reply r) {
if (r instanceof RemoveDocumentReply) {
return ((RemoveDocumentReply) r).wasFound();
}
if (r instanceof UpdateDocumentReply) {
return ((UpdateDocumentReply) r).wasFound();
}
if (r instanceof GetDocumentReply) {
return ((GetDocumentReply) r).getLastModified() > 0;
}
return false;
}
private boolean replyIsBetterThanCurrent(Reply r) {
return resourceWasFound(r) && !resourceWasFound(successReply);
}
private void updateStateWithSuccessfulReply(int i, Reply r) {
if (successReply == null || replyIsBetterThanCurrent(r)) {
setCurrentBestReply(i, r);
}
}
private void setCurrentBestReply(int i, Reply r) {
successReply = r;
successIndex = i;
}
private void mergeAllReplyErrors(Reply r) {
if (handleReplyWithOnlyIgnoredErrors(r)) {
return;
}
if (error == null) {
error = r;
}
else if (mostSevereErrorCode(r) > mostSevereErrorCode(error)) {
error.getErrors().forEach(r::addError);
error = r;
}
else {
r.getErrors().forEach(error::addError);
}
}
private static int mostSevereErrorCode(Reply reply) {
return reply.getErrors().mapToInt(Error::getCode).max()
.orElseThrow(() -> new IllegalArgumentException(reply + " has no errors"));
}
private boolean handleReplyWithOnlyIgnoredErrors(Reply r) {
if (DocumentProtocol.hasOnlyErrorsOfType(r, DocumentProtocol.ERROR_MESSAGE_IGNORED)) {
if (ignore == null) {
ignore = new EmptyReply();
}
ignore.addError(r.getError(0));
return true;
}
return false;
}
private boolean shouldReturnErrorReply() {
return (error != null || (ignore != null && successReply == null));
}
private Tuple2<Integer, Reply> createMergedErrorReplyResult() {
if (error != null) {
return new Tuple2<>(null, error);
}
if (ignore != null && successReply == null) {
return new Tuple2<>(null, ignore);
}
throw new IllegalStateException("createMergedErrorReplyResult called without error");
}
private boolean successfullyMergedAtLeastOneReply() {
return successReply != null;
}
private Tuple2<Integer, Reply> createEmptyReplyResult() {
return new Tuple2<>(null, new EmptyReply());
}
public Tuple2<Integer, Reply> mergedReply() {
if (shouldReturnErrorReply()) {
return createMergedErrorReplyResult();
} else if (!successfullyMergedAtLeastOneReply()) {
return createEmptyReplyResult();
}
return new Tuple2<>(successIndex, successReply);
}
}
|
