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
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.logging;
import com.yahoo.data.access.Inspectable;
import com.yahoo.data.access.Inspector;
import com.yahoo.data.access.simple.JsonRender;
import com.yahoo.yolean.trace.TraceNode;
import com.yahoo.yolean.trace.TraceVisitor;
import com.fasterxml.jackson.core.JsonGenerator;
import java.io.IOException;
public class TraceRenderer extends TraceVisitor {
private static final String TRACE_CHILDREN = "children";
private static final String TRACE_MESSAGE = "message";
private static final String TRACE_TIMESTAMP = "timestamp";
private static final String TRACE = "trace";
private final long basetime;
private final JsonGenerator generator;
private final FieldConsumer fieldConsumer;
private boolean hasFieldName = false;
int emittedChildNesting = 0;
int currentChildNesting = 0;
private boolean insideOpenObject = false;
public interface FieldConsumer {
void accept(Object object) throws IOException;
}
private static class Consumer implements FieldConsumer {
private final JsonGenerator generator;
Consumer(JsonGenerator generator) {
this.generator = generator;
}
@Override
public void accept(Object object) throws IOException {
if (object instanceof Inspectable) {
renderInspectorDirect(((Inspectable) object).inspect());
} else {
generator.writeObject(object);
}
}
private void renderInspectorDirect(Inspector data) throws IOException {
StringBuilder intermediate = new StringBuilder();
JsonRender.render(data, intermediate, true);
generator.writeRawValue(intermediate.toString());
}
}
TraceRenderer(JsonGenerator generator, long basetime) {
this(generator, new Consumer(generator), basetime);
}
public TraceRenderer(JsonGenerator generator, FieldConsumer consumer, long basetime) {
this.generator = generator;
this.fieldConsumer = consumer;
this.basetime = basetime;
}
@Override
public void entering(TraceNode node) {
++currentChildNesting;
}
@Override
public void leaving(TraceNode node) {
conditionalEndObject();
if (currentChildNesting == emittedChildNesting) {
try {
generator.writeEndArray();
generator.writeEndObject();
} catch (IOException e) {
throw new TraceRenderWrapper(e);
}
--emittedChildNesting;
}
--currentChildNesting;
}
@Override
public void visit(TraceNode node) {
try {
doVisit(node.timestamp(), node.payload(), node.children().iterator().hasNext());
} catch (IOException e) {
throw new TraceRenderWrapper(e);
}
}
private void doVisit(long timestamp, Object payload, boolean hasChildren) throws IOException {
boolean dirty = false;
if (timestamp != 0L) {
header();
generator.writeStartObject();
generator.writeNumberField(TRACE_TIMESTAMP, timestamp - basetime);
dirty = true;
}
if (payload != null) {
if (!dirty) {
header();
generator.writeStartObject();
}
generator.writeFieldName(TRACE_MESSAGE);
fieldConsumer.accept(payload);
dirty = true;
}
if (dirty) {
if (!hasChildren) {
generator.writeEndObject();
} else {
setInsideOpenObject(true);
}
}
}
private void header() {
fieldName();
for (int i = 0; i < (currentChildNesting - emittedChildNesting); ++i) {
startChildArray();
}
emittedChildNesting = currentChildNesting;
}
private void startChildArray() {
try {
conditionalStartObject();
generator.writeArrayFieldStart(TRACE_CHILDREN);
} catch (IOException e) {
throw new TraceRenderWrapper(e);
}
}
private void conditionalStartObject() throws IOException {
if (!isInsideOpenObject()) {
generator.writeStartObject();
} else {
setInsideOpenObject(false);
}
}
private void conditionalEndObject() {
if (isInsideOpenObject()) {
// This triggers if we were inside a data node with payload and
// subnodes, but none of the subnodes contained data
try {
generator.writeEndObject();
setInsideOpenObject(false);
} catch (IOException e) {
throw new TraceRenderWrapper(e);
}
}
}
private void fieldName() {
if (hasFieldName) {
return;
}
try {
generator.writeFieldName(TRACE);
} catch (IOException e) {
throw new TraceRenderWrapper(e);
}
hasFieldName = true;
}
boolean isInsideOpenObject() {
return insideOpenObject;
}
void setInsideOpenObject(boolean insideOpenObject) {
this.insideOpenObject = insideOpenObject;
}
public static final class TraceRenderWrapper extends RuntimeException {
/**
* Should never be serialized, but this is still needed.
*/
private static final long serialVersionUID = 2L;
TraceRenderWrapper(IOException wrapped) {
super(wrapped);
}
}
}
|
