-
Notifications
You must be signed in to change notification settings - Fork 899
/
WorkflowEngine.java
290 lines (236 loc) · 8.14 KB
/
WorkflowEngine.java
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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
package com.dtolabs.rundeck.core.rules;
import com.google.common.util.concurrent.*;
import org.apache.log4j.Logger;
import java.util.*;
import java.util.concurrent.*;
/**
* A WorkflowSystem which processes the operations by use of a rule system and a mutable state.
* implementation: Operations can supply state changes after they succeed, or fail. State
* changes
* provided by
* operations are added in the order they are received, and after a set of available state
* changes are added, the rule engine is used to update the state based on its rules. After
* the state is updated, all pending operations are queried to see if they can run given the new
* state, and any that can are queued to be executed. Workflow processing stops when no operations
* are currently running, no new state changes are available, and no pending operations can be run.
*/
public class WorkflowEngine
implements StateWorkflowSystem, WorkflowSystemEventHandler
{
static Logger logger = Logger.getLogger(WorkflowEngine.class.getName());
private final MutableStateObj state;
private final RuleEngine engine;
private final ListeningExecutorService executorService;
private final ListeningExecutorService manager;
private WorkflowSystemEventListener listener;
private volatile boolean interrupted;
/**
* Create engine
*
* @param engine rule engine to process state changes via rules
* @param state initial state
* @param executor executor to process operations, which should be multithreaded to process operations concurrently
*/
public WorkflowEngine(
final RuleEngine engine,
final MutableStateObj state,
final ExecutorService executor
)
{
this.engine = engine;
this.state = state;
executorService = MoreExecutors.listeningDecorator(executor);
manager = MoreExecutors.listeningDecorator(Executors.newCachedThreadPool());
}
@Override
public MutableStateObj getState() {
return state;
}
@Override
public RuleEngine getRuleEngine() {
return engine;
}
static class Sleeper {
private long orig = 250;
private long mult = 2;
private long max = 5000L;
private long time = orig;
private TimeUnit unit = TimeUnit.MILLISECONDS;
long time() {
return time;
}
void backoff() {
time = Math.min(time * mult, max);
}
void reset() {
time = orig;
}
TimeUnit unit() {
return unit;
}
}
public <DAT,
RES extends OperationCompleted<DAT>,
OP extends Operation<DAT, RES>
>
Set<OperationResult<DAT, RES, OP>> processOperations(final Set<OP> operations, final SharedData<DAT> sharedData) {
WorkflowEngineOperationsProcessor<DAT, RES, OP> processor = new WorkflowEngineOperationsProcessor<>(
this,
this,
operations,
sharedData,
executorService,
manager
);
processor.beginProcessing();
Set<OperationResult<DAT, RES, OP>> results = processor.getResults();
interrupted = processor.isInterrupted();
event(WorkflowSystemEventType.WillShutdown,
String.format("Workflow engine shutting down (interrupted? %s)", interrupted)
);
executorService.shutdown();
try {
if (!executorService.awaitTermination(5, TimeUnit.MINUTES)) {
executorService.shutdownNow();
}
} catch (InterruptedException ignored) {
Thread.currentThread().interrupt();
}
manager.shutdown();
try {
if (!manager.awaitTermination(5, TimeUnit.MINUTES)) {
manager.shutdownNow();
}
} catch (InterruptedException ignored) {
Thread.currentThread().interrupt();
}
if (!processor.getPending().isEmpty()) {
event(
WorkflowSystemEventType.IncompleteOperations,
String.format("Some operations were not run: %d", processor.getPending().size()),
processor.getPending()
);
}
event(WorkflowSystemEventType.Complete, String.format("Workflow complete: %s", results));
return results;
}
static class Event implements WorkflowSystemEvent {
private WorkflowSystemEventType eventType;
private String message;
private Object data;
Event(final WorkflowSystemEventType eventType, final String message, final Object data) {
this.eventType = eventType;
this.message = message;
this.data = data;
}
static Event with(WorkflowSystemEventType type, String message) {
return new Event(type, message, null);
}
static Event with(WorkflowSystemEventType type, String message, Object data) {
return new Event(type, message, data);
}
@Override
public WorkflowSystemEventType getEventType() {
return eventType;
}
public void setEventType(WorkflowSystemEventType eventType) {
this.eventType = eventType;
}
@Override
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
@Override
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
}
static <T> OperationCompleted<T> dummyResult(final StateObj state) {
return new OperationCompleted<T>() {
@Override
public StateObj getNewState() {
return state;
}
@Override
public T getResult() {
return null;
}
};
}
@Override
public void event(final WorkflowSystemEventType eventType, final String message) {
event(eventType, message, null);
}
@Override
public void event(final WorkflowSystemEventType eventType, final String message, final Object data) {
event(Event.with(eventType, message, data));
}
@Override
public void event(final WorkflowSystemEvent event) {
if (null != listener) {
listener.onEvent(event);
}
}
@Override
public boolean isWorkflowEndState() {
return getState().hasState(Workflows.getWorkflowEndState());
}
@Override
public WorkflowSystemEventListener getListener() {
return listener;
}
@Override
public void setListener(WorkflowSystemEventListener listener) {
this.listener = listener;
}
@Override
public boolean isInterrupted() {
return interrupted;
}
static class WResult<D, T extends OperationCompleted<D>, X extends Operation<D, T>> implements
OperationResult<D, T, X>
{
final private X operation;
WResult(final X operation, final Throwable throwable) {
this.operation = operation;
this.throwable = throwable;
this.success = null;
}
WResult(final X operation, final T success) {
this.operation = operation;
this.success = success;
this.throwable = null;
}
final Throwable throwable;
final T success;
@Override
public Throwable getFailure() {
return throwable;
}
@Override
public T getSuccess() {
return success;
}
@Override
public X getOperation() {
return operation;
}
@Override
public String toString() {
return operation +
": " +
(null != success ? success : null != throwable ? throwable.getClass().getSimpleName() : "?");
}
}
private Map<String, String> map(final String key, final String value) {
HashMap<String, String> map = new HashMap<>();
map.put(key, value);
return map;
}
}