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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.documentapi.local;
import com.yahoo.document.Document;
import com.yahoo.document.DocumentId;
import com.yahoo.document.DocumentPut;
import com.yahoo.document.fieldset.FieldSet;
import com.yahoo.document.fieldset.FieldSetRepo;
import com.yahoo.document.select.DocumentSelector;
import com.yahoo.document.select.Result;
import com.yahoo.document.select.parser.ParseException;
import com.yahoo.documentapi.AckToken;
import com.yahoo.documentapi.ProgressToken;
import com.yahoo.documentapi.VisitorControlHandler;
import com.yahoo.documentapi.VisitorDataHandler;
import com.yahoo.documentapi.VisitorDataQueue;
import com.yahoo.documentapi.VisitorParameters;
import com.yahoo.documentapi.VisitorResponse;
import com.yahoo.documentapi.VisitorSession;
import com.yahoo.documentapi.messagebus.protocol.PutDocumentMessage;
import com.yahoo.messagebus.Trace;
import com.yahoo.yolean.Exceptions;
import java.util.Comparator;
import java.util.Map;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.Phaser;
import java.util.concurrent.atomic.AtomicReference;
/**
* Local visitor session that copies and iterates through all items in the local document access.
* Each document must be ack'ed for the session to be done visiting, unless the destination is remote.
* Only document puts are sent by this session, and this is done from a separate thread.
*
* @author jonmv
*/
public class LocalVisitorSession implements VisitorSession {
private enum State { RUNNING, FAILURE, ABORTED, SUCCESS }
private final VisitorDataHandler data;
private final VisitorControlHandler control;
private final Map<DocumentId, Document> outstanding;
private final DocumentSelector selector;
private final FieldSet fieldSet;
private final AtomicReference<State> state;
private final AtomicReference<Phaser> phaser;
private final ProgressToken token;
public LocalVisitorSession(LocalDocumentAccess access, VisitorParameters parameters) throws ParseException {
this.selector = new DocumentSelector(parameters.getDocumentSelection());
this.fieldSet = new FieldSetRepo().parse(access.getDocumentTypeManager(), parameters.fieldSet());
this.token = parameters.getResumeToken();
if (parameters.getRemoteDataHandler() == null) {
this.data = parameters.getLocalDataHandler() == null ? new VisitorDataQueue() : parameters.getLocalDataHandler();
this.data.reset();
this.data.setSession(this);
}
else {
if (parameters.getLocalDataHandler() != null)
throw new IllegalArgumentException("Cannot have both a remote and a local data handler");
this.data = null;
}
this.control = parameters.getControlHandler() == null ? new VisitorControlHandler() : parameters.getControlHandler();
this.control.reset();
this.control.setSession(this);
this.outstanding = new ConcurrentSkipListMap<>(Comparator.comparing(DocumentId::toString));
this.outstanding.putAll(access.documents);
this.state = new AtomicReference<>(State.RUNNING);
this.phaser = access.phaser;
start();
}
void start() {
Phaser synchronizer = phaser.get();
if (synchronizer != null)
synchronizer.register();
new Thread(() -> {
try {
// Iterate through all documents and pass on to data handler
outstanding.forEach((id, document) -> {
if (state.get() != State.RUNNING)
return;
try {
if (selector.accepts(new DocumentPut(document)) != Result.TRUE)
return;
}
catch (RuntimeException e) {
return;
}
Document copy = new Document(document.getDataType(), document.getId());
new FieldSetRepo().copyFields(document, copy, fieldSet);
if (synchronizer != null)
synchronizer.arriveAndAwaitAdvance();
if (data != null)
data.onMessage(new PutDocumentMessage(new DocumentPut(copy)),
new AckToken(id));
else
outstanding.remove(id);
if (synchronizer != null)
synchronizer.arriveAndAwaitAdvance();
});
// Transition to a terminal state when done
state.updateAndGet(current -> {
switch (current) {
case RUNNING:
control.onDone(VisitorControlHandler.CompletionCode.SUCCESS, "Success");
return State.SUCCESS;
case ABORTED:
control.onDone(VisitorControlHandler.CompletionCode.ABORTED, "Aborted by user");
return State.ABORTED;
default:
control.onDone(VisitorControlHandler.CompletionCode.FAILURE, "Unexpected state '" + current + "'");;
return State.FAILURE;
}
});
}
// Transition to failure terminal state on error
catch (Exception e) {
state.set(State.FAILURE);
outstanding.clear();
control.onDone(VisitorControlHandler.CompletionCode.FAILURE, Exceptions.toMessageString(e));
}
finally {
if (synchronizer != null)
synchronizer.arriveAndDeregister();
if (data != null)
data.onDone();
}
}).start();
}
@Override
public boolean isDone() {
return outstanding.isEmpty() // All documents ack'ed
&& control.isDone(); // Control handler has been notified
}
/** Returns the token set in the parameters used to create this. */
@Override
public ProgressToken getProgress() {
return token;
}
@Override
public Trace getTrace() {
throw new UnsupportedOperationException("Traces are not supported");
}
@Override
public boolean waitUntilDone(long timeoutMs) throws InterruptedException {
return control.waitUntilDone(timeoutMs);
}
@Override
public void ack(AckToken token) {
outstanding.remove((DocumentId) token.ackObject);
}
@Override
public void abort() {
state.updateAndGet(current -> current == State.RUNNING ? State.ABORTED : current);
outstanding.clear();
}
@Override
public VisitorResponse getNext() {
return data.getNext();
}
@Override
public VisitorResponse getNext(int timeoutMilliseconds) throws InterruptedException {
return data.getNext(timeoutMilliseconds);
}
@Override
public void destroy() {
abort();
try {
control.waitUntilDone(0);
}
catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
|
