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
|
// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.session;
import com.yahoo.component.Version;
import com.yahoo.config.FileReference;
import com.yahoo.config.application.api.ApplicationFile;
import com.yahoo.config.application.api.ApplicationMetaData;
import com.yahoo.config.application.api.ApplicationPackage;
import com.yahoo.config.provision.AllocatedHosts;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.AthenzDomain;
import com.yahoo.config.provision.DockerImage;
import com.yahoo.config.provision.TenantName;
import com.yahoo.path.Path;
import com.yahoo.transaction.Transaction;
import com.yahoo.vespa.config.server.tenant.TenantRepository;
import java.time.Instant;
import java.util.Optional;
/**
* A session represents an instance of an application that can be edited, prepared and activated. This
* class represents the common stuff between sessions working on the local file
* system ({@link LocalSession}s) and sessions working on zookeeper ({@link RemoteSession}s).
*
* @author Ulf Lilleengen
* @author hmusum
*/
public abstract class Session implements Comparable<Session> {
private final long sessionId;
protected final TenantName tenant;
protected final SessionZooKeeperClient sessionZooKeeperClient;
protected final Optional<ApplicationPackage> applicationPackage;
protected Session(TenantName tenant, long sessionId, SessionZooKeeperClient sessionZooKeeperClient) {
this.tenant = tenant;
this.sessionId = sessionId;
this.sessionZooKeeperClient = sessionZooKeeperClient;
this.applicationPackage = Optional.empty();
}
protected Session(TenantName tenant, long sessionId, SessionZooKeeperClient sessionZooKeeperClient,
ApplicationPackage applicationPackage) {
this.tenant = tenant;
this.sessionId = sessionId;
this.sessionZooKeeperClient = sessionZooKeeperClient;
this.applicationPackage = Optional.of(applicationPackage);
}
public final long getSessionId() {
return sessionId;
}
public Session.Status getStatus() {
return sessionZooKeeperClient.readStatus();
}
public SessionZooKeeperClient getSessionZooKeeperClient() {
return sessionZooKeeperClient;
}
@Override
public String toString() {
return "Session,id=" + sessionId;
}
public long getActiveSessionAtCreate() {
return getMetaData().getPreviousActiveGeneration();
}
/**
* The status of this session.
*/
public enum Status {
NEW, PREPARE, ACTIVATE, DEACTIVATE, DELETE, NONE;
public static Status parse(String data) {
for (Status status : Status.values()) {
if (status.name().equals(data)) {
return status;
}
}
return Status.NEW;
}
}
public TenantName getTenantName() { return tenant; }
/**
* Helper to provide a log message preamble for code dealing with sessions
* @return log preamble
*/
public String logPre() {
Optional<ApplicationId> applicationId;
// We might not be able to read application id from zookeeper
// e.g. when the app has been deleted. Use tenant name in that case.
try {
applicationId = Optional.of(getApplicationId());
} catch (Exception e) {
applicationId = Optional.empty();
}
return applicationId
.filter(appId -> ! appId.equals(ApplicationId.defaultId()))
.map(TenantRepository::logPre)
.orElse(TenantRepository.logPre(getTenantName()));
}
public Instant getCreateTime() {
return sessionZooKeeperClient.readCreateTime();
}
public void setApplicationId(ApplicationId applicationId) {
sessionZooKeeperClient.writeApplicationId(applicationId);
}
void setApplicationPackageReference(FileReference applicationPackageReference) {
if (applicationPackageReference == null) throw new IllegalArgumentException(String.format(
"Null application package file reference for tenant %s, session id %d", tenant, sessionId));
sessionZooKeeperClient.writeApplicationPackageReference(applicationPackageReference);
}
public void setVespaVersion(Version version) {
sessionZooKeeperClient.writeVespaVersion(version);
}
public void setDockerImageRepository(Optional<DockerImage> dockerImageRepository) {
sessionZooKeeperClient.writeDockerImageRepository(dockerImageRepository);
}
public void setAthenzDomain(Optional<AthenzDomain> athenzDomain) {
sessionZooKeeperClient.writeAthenzDomain(athenzDomain);
}
public ApplicationId getApplicationId() { return sessionZooKeeperClient.readApplicationId(); }
public FileReference getApplicationPackageReference() {return sessionZooKeeperClient.readApplicationPackageReference(); }
public Optional<DockerImage> getDockerImageRepository() { return sessionZooKeeperClient.readDockerImageRepository(); }
public Version getVespaVersion() { return sessionZooKeeperClient.readVespaVersion(); }
public Optional<AthenzDomain> getAthenzDomain() { return sessionZooKeeperClient.readAthenzDomain(); }
public AllocatedHosts getAllocatedHosts() {
return sessionZooKeeperClient.getAllocatedHosts();
}
public Transaction createDeactivateTransaction() {
return createSetStatusTransaction(Status.DEACTIVATE);
}
private Transaction createSetStatusTransaction(Status status) {
return sessionZooKeeperClient.createWriteStatusTransaction(status);
}
// Note: Assumes monotonically increasing session ids
public boolean isNewerThan(long sessionId) { return getSessionId() > sessionId; }
public ApplicationMetaData getMetaData() {
return applicationPackage.isPresent()
? applicationPackage.get().getMetaData()
: sessionZooKeeperClient.loadApplicationPackage().getMetaData();
}
public ApplicationPackage getApplicationPackage() {
return applicationPackage.orElseThrow(() -> new RuntimeException("No application package found for " + this));
}
public ApplicationFile getApplicationFile(Path relativePath, LocalSession.Mode mode) {
if (mode.equals(Session.Mode.WRITE)) {
markSessionEdited();
}
return getApplicationPackage().getFile(relativePath);
}
private void markSessionEdited() {
setStatus(Session.Status.NEW);
}
void setStatus(Session.Status newStatus) {
sessionZooKeeperClient.writeStatus(newStatus);
}
@Override
public int compareTo(Session rhs) {
Long lhsId = getSessionId();
Long rhsId = rhs.getSessionId();
return lhsId.compareTo(rhsId);
}
public enum Mode {
READ, WRITE
}
}
|
