author | psandoz |
Fri, 09 Sep 2016 14:54:29 -0700 | |
changeset 40806 | 46132d430504 |
parent 36224 | 6a0a5bdfe79f |
permissions | -rw-r--r-- |
17182 | 1 |
/* |
36224
6a0a5bdfe79f
8147505: BaseStream.onClose() should not allow registering new handlers after stream is consumed
tvaleev
parents:
31644
diff
changeset
|
2 |
* Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved. |
17182 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 |
* |
|
5 |
* This code is free software; you can redistribute it and/or modify it |
|
6 |
* under the terms of the GNU General Public License version 2 only, as |
|
7 |
* published by the Free Software Foundation. Oracle designates this |
|
8 |
* particular file as subject to the "Classpath" exception as provided |
|
9 |
* by Oracle in the LICENSE file that accompanied this code. |
|
10 |
* |
|
11 |
* This code is distributed in the hope that it will be useful, but WITHOUT |
|
12 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
13 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
14 |
* version 2 for more details (a copy is included in the LICENSE file that |
|
15 |
* accompanied this code). |
|
16 |
* |
|
17 |
* You should have received a copy of the GNU General Public License version |
|
18 |
* 2 along with this work; if not, write to the Free Software Foundation, |
|
19 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
20 |
* |
|
21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
22 |
* or visit www.oracle.com if you need additional information or have any |
|
23 |
* questions. |
|
24 |
*/ |
|
25 |
package java.util.stream; |
|
26 |
||
27 |
import java.util.Objects; |
|
28 |
import java.util.Spliterator; |
|
29 |
import java.util.function.IntFunction; |
|
30 |
import java.util.function.Supplier; |
|
31 |
||
32 |
/** |
|
33 |
* Abstract base class for "pipeline" classes, which are the core |
|
34 |
* implementations of the Stream interface and its primitive specializations. |
|
35 |
* Manages construction and evaluation of stream pipelines. |
|
36 |
* |
|
37 |
* <p>An {@code AbstractPipeline} represents an initial portion of a stream |
|
38 |
* pipeline, encapsulating a stream source and zero or more intermediate |
|
39 |
* operations. The individual {@code AbstractPipeline} objects are often |
|
40 |
* referred to as <em>stages</em>, where each stage describes either the stream |
|
41 |
* source or an intermediate operation. |
|
42 |
* |
|
43 |
* <p>A concrete intermediate stage is generally built from an |
|
44 |
* {@code AbstractPipeline}, a shape-specific pipeline class which extends it |
|
45 |
* (e.g., {@code IntPipeline}) which is also abstract, and an operation-specific |
|
46 |
* concrete class which extends that. {@code AbstractPipeline} contains most of |
|
47 |
* the mechanics of evaluating the pipeline, and implements methods that will be |
|
48 |
* used by the operation; the shape-specific classes add helper methods for |
|
49 |
* dealing with collection of results into the appropriate shape-specific |
|
50 |
* containers. |
|
51 |
* |
|
52 |
* <p>After chaining a new intermediate operation, or executing a terminal |
|
53 |
* operation, the stream is considered to be consumed, and no more intermediate |
|
54 |
* or terminal operations are permitted on this stream instance. |
|
55 |
* |
|
56 |
* @implNote |
|
57 |
* <p>For sequential streams, and parallel streams without |
|
58 |
* <a href="package-summary.html#StreamOps">stateful intermediate |
|
59 |
* operations</a>, parallel streams, pipeline evaluation is done in a single |
|
60 |
* pass that "jams" all the operations together. For parallel streams with |
|
61 |
* stateful operations, execution is divided into segments, where each |
|
62 |
* stateful operations marks the end of a segment, and each segment is |
|
63 |
* evaluated separately and the result used as the input to the next |
|
64 |
* segment. In all cases, the source data is not consumed until a terminal |
|
65 |
* operation begins. |
|
66 |
* |
|
67 |
* @param <E_IN> type of input elements |
|
68 |
* @param <E_OUT> type of output elements |
|
69 |
* @param <S> type of the subclass implementing {@code BaseStream} |
|
70 |
* @since 1.8 |
|
71 |
*/ |
|
72 |
abstract class AbstractPipeline<E_IN, E_OUT, S extends BaseStream<E_OUT, S>> |
|
18789 | 73 |
extends PipelineHelper<E_OUT> implements BaseStream<E_OUT, S> { |
19800 | 74 |
private static final String MSG_STREAM_LINKED = "stream has already been operated upon or closed"; |
75 |
private static final String MSG_CONSUMED = "source already consumed or closed"; |
|
76 |
||
17182 | 77 |
/** |
78 |
* Backlink to the head of the pipeline chain (self if this is the source |
|
79 |
* stage). |
|
80 |
*/ |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
81 |
@SuppressWarnings("rawtypes") |
17182 | 82 |
private final AbstractPipeline sourceStage; |
83 |
||
84 |
/** |
|
85 |
* The "upstream" pipeline, or null if this is the source stage. |
|
86 |
*/ |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
87 |
@SuppressWarnings("rawtypes") |
17182 | 88 |
private final AbstractPipeline previousStage; |
89 |
||
90 |
/** |
|
91 |
* The operation flags for the intermediate operation represented by this |
|
92 |
* pipeline object. |
|
93 |
*/ |
|
94 |
protected final int sourceOrOpFlags; |
|
95 |
||
96 |
/** |
|
97 |
* The next stage in the pipeline, or null if this is the last stage. |
|
98 |
* Effectively final at the point of linking to the next pipeline. |
|
99 |
*/ |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
100 |
@SuppressWarnings("rawtypes") |
17182 | 101 |
private AbstractPipeline nextStage; |
102 |
||
103 |
/** |
|
104 |
* The number of intermediate operations between this pipeline object |
|
105 |
* and the stream source if sequential, or the previous stateful if parallel. |
|
106 |
* Valid at the point of pipeline preparation for evaluation. |
|
107 |
*/ |
|
108 |
private int depth; |
|
109 |
||
110 |
/** |
|
111 |
* The combined source and operation flags for the source and all operations |
|
112 |
* up to and including the operation represented by this pipeline object. |
|
113 |
* Valid at the point of pipeline preparation for evaluation. |
|
114 |
*/ |
|
115 |
private int combinedFlags; |
|
116 |
||
117 |
/** |
|
118 |
* The source spliterator. Only valid for the head pipeline. |
|
119 |
* Before the pipeline is consumed if non-null then {@code sourceSupplier} |
|
120 |
* must be null. After the pipeline is consumed if non-null then is set to |
|
121 |
* null. |
|
122 |
*/ |
|
123 |
private Spliterator<?> sourceSpliterator; |
|
124 |
||
125 |
/** |
|
126 |
* The source supplier. Only valid for the head pipeline. Before the |
|
127 |
* pipeline is consumed if non-null then {@code sourceSpliterator} must be |
|
128 |
* null. After the pipeline is consumed if non-null then is set to null. |
|
129 |
*/ |
|
130 |
private Supplier<? extends Spliterator<?>> sourceSupplier; |
|
131 |
||
132 |
/** |
|
133 |
* True if this pipeline has been linked or consumed |
|
134 |
*/ |
|
135 |
private boolean linkedOrConsumed; |
|
136 |
||
137 |
/** |
|
138 |
* True if there are any stateful ops in the pipeline; only valid for the |
|
139 |
* source stage. |
|
140 |
*/ |
|
141 |
private boolean sourceAnyStateful; |
|
142 |
||
19800 | 143 |
private Runnable sourceCloseAction; |
144 |
||
17182 | 145 |
/** |
146 |
* True if pipeline is parallel, otherwise the pipeline is sequential; only |
|
147 |
* valid for the source stage. |
|
148 |
*/ |
|
149 |
private boolean parallel; |
|
150 |
||
151 |
/** |
|
152 |
* Constructor for the head of a stream pipeline. |
|
153 |
* |
|
154 |
* @param source {@code Supplier<Spliterator>} describing the stream source |
|
155 |
* @param sourceFlags The source flags for the stream source, described in |
|
156 |
* {@link StreamOpFlag} |
|
157 |
* @param parallel True if the pipeline is parallel |
|
158 |
*/ |
|
159 |
AbstractPipeline(Supplier<? extends Spliterator<?>> source, |
|
160 |
int sourceFlags, boolean parallel) { |
|
161 |
this.previousStage = null; |
|
162 |
this.sourceSupplier = source; |
|
163 |
this.sourceStage = this; |
|
164 |
this.sourceOrOpFlags = sourceFlags & StreamOpFlag.STREAM_MASK; |
|
165 |
// The following is an optimization of: |
|
166 |
// StreamOpFlag.combineOpFlags(sourceOrOpFlags, StreamOpFlag.INITIAL_OPS_VALUE); |
|
167 |
this.combinedFlags = (~(sourceOrOpFlags << 1)) & StreamOpFlag.INITIAL_OPS_VALUE; |
|
168 |
this.depth = 0; |
|
169 |
this.parallel = parallel; |
|
170 |
} |
|
171 |
||
172 |
/** |
|
173 |
* Constructor for the head of a stream pipeline. |
|
174 |
* |
|
175 |
* @param source {@code Spliterator} describing the stream source |
|
176 |
* @param sourceFlags the source flags for the stream source, described in |
|
177 |
* {@link StreamOpFlag} |
|
178 |
* @param parallel {@code true} if the pipeline is parallel |
|
179 |
*/ |
|
180 |
AbstractPipeline(Spliterator<?> source, |
|
181 |
int sourceFlags, boolean parallel) { |
|
182 |
this.previousStage = null; |
|
183 |
this.sourceSpliterator = source; |
|
184 |
this.sourceStage = this; |
|
185 |
this.sourceOrOpFlags = sourceFlags & StreamOpFlag.STREAM_MASK; |
|
186 |
// The following is an optimization of: |
|
187 |
// StreamOpFlag.combineOpFlags(sourceOrOpFlags, StreamOpFlag.INITIAL_OPS_VALUE); |
|
188 |
this.combinedFlags = (~(sourceOrOpFlags << 1)) & StreamOpFlag.INITIAL_OPS_VALUE; |
|
189 |
this.depth = 0; |
|
190 |
this.parallel = parallel; |
|
191 |
} |
|
192 |
||
193 |
/** |
|
194 |
* Constructor for appending an intermediate operation stage onto an |
|
195 |
* existing pipeline. |
|
196 |
* |
|
197 |
* @param previousStage the upstream pipeline stage |
|
198 |
* @param opFlags the operation flags for the new stage, described in |
|
199 |
* {@link StreamOpFlag} |
|
200 |
*/ |
|
201 |
AbstractPipeline(AbstractPipeline<?, E_IN, ?> previousStage, int opFlags) { |
|
202 |
if (previousStage.linkedOrConsumed) |
|
19800 | 203 |
throw new IllegalStateException(MSG_STREAM_LINKED); |
17182 | 204 |
previousStage.linkedOrConsumed = true; |
205 |
previousStage.nextStage = this; |
|
206 |
||
207 |
this.previousStage = previousStage; |
|
208 |
this.sourceOrOpFlags = opFlags & StreamOpFlag.OP_MASK; |
|
209 |
this.combinedFlags = StreamOpFlag.combineOpFlags(opFlags, previousStage.combinedFlags); |
|
210 |
this.sourceStage = previousStage.sourceStage; |
|
211 |
if (opIsStateful()) |
|
212 |
sourceStage.sourceAnyStateful = true; |
|
213 |
this.depth = previousStage.depth + 1; |
|
214 |
} |
|
215 |
||
216 |
||
217 |
// Terminal evaluation methods |
|
218 |
||
219 |
/** |
|
220 |
* Evaluate the pipeline with a terminal operation to produce a result. |
|
221 |
* |
|
222 |
* @param <R> the type of result |
|
223 |
* @param terminalOp the terminal operation to be applied to the pipeline. |
|
224 |
* @return the result |
|
225 |
*/ |
|
226 |
final <R> R evaluate(TerminalOp<E_OUT, R> terminalOp) { |
|
227 |
assert getOutputShape() == terminalOp.inputShape(); |
|
228 |
if (linkedOrConsumed) |
|
19800 | 229 |
throw new IllegalStateException(MSG_STREAM_LINKED); |
17182 | 230 |
linkedOrConsumed = true; |
231 |
||
232 |
return isParallel() |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
233 |
? terminalOp.evaluateParallel(this, sourceSpliterator(terminalOp.getOpFlags())) |
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
234 |
: terminalOp.evaluateSequential(this, sourceSpliterator(terminalOp.getOpFlags())); |
17182 | 235 |
} |
236 |
||
237 |
/** |
|
238 |
* Collect the elements output from the pipeline stage. |
|
239 |
* |
|
240 |
* @param generator the array generator to be used to create array instances |
|
241 |
* @return a flat array-backed Node that holds the collected output elements |
|
242 |
*/ |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
243 |
@SuppressWarnings("unchecked") |
17182 | 244 |
final Node<E_OUT> evaluateToArrayNode(IntFunction<E_OUT[]> generator) { |
245 |
if (linkedOrConsumed) |
|
19800 | 246 |
throw new IllegalStateException(MSG_STREAM_LINKED); |
17182 | 247 |
linkedOrConsumed = true; |
248 |
||
249 |
// If the last intermediate operation is stateful then |
|
250 |
// evaluate directly to avoid an extra collection step |
|
251 |
if (isParallel() && previousStage != null && opIsStateful()) { |
|
31248
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
252 |
// Set the depth of this, last, pipeline stage to zero to slice the |
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
253 |
// pipeline such that this operation will not be included in the |
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
254 |
// upstream slice and upstream operations will not be included |
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
255 |
// in this slice |
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
256 |
depth = 0; |
17182 | 257 |
return opEvaluateParallel(previousStage, previousStage.sourceSpliterator(0), generator); |
258 |
} |
|
259 |
else { |
|
260 |
return evaluate(sourceSpliterator(0), true, generator); |
|
261 |
} |
|
262 |
} |
|
263 |
||
264 |
/** |
|
265 |
* Gets the source stage spliterator if this pipeline stage is the source |
|
266 |
* stage. The pipeline is consumed after this method is called and |
|
267 |
* returns successfully. |
|
268 |
* |
|
269 |
* @return the source stage spliterator |
|
270 |
* @throws IllegalStateException if this pipeline stage is not the source |
|
271 |
* stage. |
|
272 |
*/ |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
273 |
@SuppressWarnings("unchecked") |
17182 | 274 |
final Spliterator<E_OUT> sourceStageSpliterator() { |
275 |
if (this != sourceStage) |
|
276 |
throw new IllegalStateException(); |
|
277 |
||
278 |
if (linkedOrConsumed) |
|
19800 | 279 |
throw new IllegalStateException(MSG_STREAM_LINKED); |
17182 | 280 |
linkedOrConsumed = true; |
281 |
||
282 |
if (sourceStage.sourceSpliterator != null) { |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
283 |
@SuppressWarnings("unchecked") |
17182 | 284 |
Spliterator<E_OUT> s = sourceStage.sourceSpliterator; |
285 |
sourceStage.sourceSpliterator = null; |
|
286 |
return s; |
|
287 |
} |
|
288 |
else if (sourceStage.sourceSupplier != null) { |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
289 |
@SuppressWarnings("unchecked") |
17182 | 290 |
Spliterator<E_OUT> s = (Spliterator<E_OUT>) sourceStage.sourceSupplier.get(); |
291 |
sourceStage.sourceSupplier = null; |
|
292 |
return s; |
|
293 |
} |
|
294 |
else { |
|
19800 | 295 |
throw new IllegalStateException(MSG_CONSUMED); |
17182 | 296 |
} |
297 |
} |
|
298 |
||
299 |
// BaseStream |
|
300 |
||
18789 | 301 |
@Override |
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
302 |
@SuppressWarnings("unchecked") |
17182 | 303 |
public final S sequential() { |
304 |
sourceStage.parallel = false; |
|
305 |
return (S) this; |
|
306 |
} |
|
307 |
||
18789 | 308 |
@Override |
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
309 |
@SuppressWarnings("unchecked") |
17182 | 310 |
public final S parallel() { |
311 |
sourceStage.parallel = true; |
|
312 |
return (S) this; |
|
313 |
} |
|
314 |
||
19800 | 315 |
@Override |
316 |
public void close() { |
|
317 |
linkedOrConsumed = true; |
|
318 |
sourceSupplier = null; |
|
319 |
sourceSpliterator = null; |
|
320 |
if (sourceStage.sourceCloseAction != null) { |
|
321 |
Runnable closeAction = sourceStage.sourceCloseAction; |
|
322 |
sourceStage.sourceCloseAction = null; |
|
323 |
closeAction.run(); |
|
324 |
} |
|
325 |
} |
|
326 |
||
327 |
@Override |
|
328 |
@SuppressWarnings("unchecked") |
|
329 |
public S onClose(Runnable closeHandler) { |
|
36224
6a0a5bdfe79f
8147505: BaseStream.onClose() should not allow registering new handlers after stream is consumed
tvaleev
parents:
31644
diff
changeset
|
330 |
if (linkedOrConsumed) |
6a0a5bdfe79f
8147505: BaseStream.onClose() should not allow registering new handlers after stream is consumed
tvaleev
parents:
31644
diff
changeset
|
331 |
throw new IllegalStateException(MSG_STREAM_LINKED); |
25526 | 332 |
Objects.requireNonNull(closeHandler); |
19800 | 333 |
Runnable existingHandler = sourceStage.sourceCloseAction; |
334 |
sourceStage.sourceCloseAction = |
|
335 |
(existingHandler == null) |
|
336 |
? closeHandler |
|
337 |
: Streams.composeWithExceptions(existingHandler, closeHandler); |
|
338 |
return (S) this; |
|
339 |
} |
|
340 |
||
17182 | 341 |
// Primitive specialization use co-variant overrides, hence is not final |
18789 | 342 |
@Override |
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
343 |
@SuppressWarnings("unchecked") |
17182 | 344 |
public Spliterator<E_OUT> spliterator() { |
345 |
if (linkedOrConsumed) |
|
19800 | 346 |
throw new IllegalStateException(MSG_STREAM_LINKED); |
17182 | 347 |
linkedOrConsumed = true; |
348 |
||
349 |
if (this == sourceStage) { |
|
350 |
if (sourceStage.sourceSpliterator != null) { |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
351 |
@SuppressWarnings("unchecked") |
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
352 |
Spliterator<E_OUT> s = (Spliterator<E_OUT>) sourceStage.sourceSpliterator; |
17182 | 353 |
sourceStage.sourceSpliterator = null; |
354 |
return s; |
|
355 |
} |
|
356 |
else if (sourceStage.sourceSupplier != null) { |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
357 |
@SuppressWarnings("unchecked") |
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
358 |
Supplier<Spliterator<E_OUT>> s = (Supplier<Spliterator<E_OUT>>) sourceStage.sourceSupplier; |
17182 | 359 |
sourceStage.sourceSupplier = null; |
360 |
return lazySpliterator(s); |
|
361 |
} |
|
362 |
else { |
|
19800 | 363 |
throw new IllegalStateException(MSG_CONSUMED); |
17182 | 364 |
} |
365 |
} |
|
366 |
else { |
|
367 |
return wrap(this, () -> sourceSpliterator(0), isParallel()); |
|
368 |
} |
|
369 |
} |
|
370 |
||
18789 | 371 |
@Override |
17182 | 372 |
public final boolean isParallel() { |
373 |
return sourceStage.parallel; |
|
374 |
} |
|
375 |
||
376 |
||
377 |
/** |
|
378 |
* Returns the composition of stream flags of the stream source and all |
|
379 |
* intermediate operations. |
|
380 |
* |
|
381 |
* @return the composition of stream flags of the stream source and all |
|
382 |
* intermediate operations |
|
383 |
* @see StreamOpFlag |
|
384 |
*/ |
|
385 |
final int getStreamFlags() { |
|
386 |
return StreamOpFlag.toStreamFlags(combinedFlags); |
|
387 |
} |
|
388 |
||
389 |
/** |
|
390 |
* Get the source spliterator for this pipeline stage. For a sequential or |
|
391 |
* stateless parallel pipeline, this is the source spliterator. For a |
|
392 |
* stateful parallel pipeline, this is a spliterator describing the results |
|
393 |
* of all computations up to and including the most recent stateful |
|
394 |
* operation. |
|
395 |
*/ |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
396 |
@SuppressWarnings("unchecked") |
17182 | 397 |
private Spliterator<?> sourceSpliterator(int terminalFlags) { |
398 |
// Get the source spliterator of the pipeline |
|
399 |
Spliterator<?> spliterator = null; |
|
400 |
if (sourceStage.sourceSpliterator != null) { |
|
401 |
spliterator = sourceStage.sourceSpliterator; |
|
402 |
sourceStage.sourceSpliterator = null; |
|
403 |
} |
|
404 |
else if (sourceStage.sourceSupplier != null) { |
|
405 |
spliterator = (Spliterator<?>) sourceStage.sourceSupplier.get(); |
|
406 |
sourceStage.sourceSupplier = null; |
|
407 |
} |
|
408 |
else { |
|
19800 | 409 |
throw new IllegalStateException(MSG_CONSUMED); |
17182 | 410 |
} |
411 |
||
29617
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
412 |
if (isParallel() && sourceStage.sourceAnyStateful) { |
31248
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
413 |
// Adapt the source spliterator, evaluating each stateful op |
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
414 |
// in the pipeline up to and including this pipeline stage. |
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
415 |
// The depth and flags of each pipeline stage are adjusted accordingly. |
29617
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
416 |
int depth = 1; |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
417 |
for (@SuppressWarnings("rawtypes") AbstractPipeline u = sourceStage, p = sourceStage.nextStage, e = this; |
17182 | 418 |
u != e; |
419 |
u = p, p = p.nextStage) { |
|
420 |
||
29617
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
421 |
int thisOpFlags = p.sourceOrOpFlags; |
17182 | 422 |
if (p.opIsStateful()) { |
31248
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
423 |
depth = 0; |
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
424 |
|
29617
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
425 |
if (StreamOpFlag.SHORT_CIRCUIT.isKnown(thisOpFlags)) { |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
426 |
// Clear the short circuit flag for next pipeline stage |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
427 |
// This stage encapsulates short-circuiting, the next |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
428 |
// stage may not have any short-circuit operations, and |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
429 |
// if so spliterator.forEachRemaining should be used |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
430 |
// for traversal |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
431 |
thisOpFlags = thisOpFlags & ~StreamOpFlag.IS_SHORT_CIRCUIT; |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
432 |
} |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
433 |
|
17182 | 434 |
spliterator = p.opEvaluateParallelLazy(u, spliterator); |
29617
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
435 |
|
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
436 |
// Inject or clear SIZED on the source pipeline stage |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
437 |
// based on the stage's spliterator |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
438 |
thisOpFlags = spliterator.hasCharacteristics(Spliterator.SIZED) |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
439 |
? (thisOpFlags & ~StreamOpFlag.NOT_SIZED) | StreamOpFlag.IS_SIZED |
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
440 |
: (thisOpFlags & ~StreamOpFlag.IS_SIZED) | StreamOpFlag.NOT_SIZED; |
17182 | 441 |
} |
31248
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
442 |
p.depth = depth++; |
29617
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
443 |
p.combinedFlags = StreamOpFlag.combineOpFlags(thisOpFlags, u.combinedFlags); |
17182 | 444 |
} |
445 |
} |
|
29617
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
446 |
|
31248
0006a0e47a04
8129120: Terminal operation properties should not be back-propagated to upstream operations
psandoz
parents:
29617
diff
changeset
|
447 |
if (terminalFlags != 0) { |
29617
4922c98744c7
8075307: Pipeline calculating inconsistent flag state for parallel stateful ops
psandoz
parents:
25859
diff
changeset
|
448 |
// Apply flags from the terminal operation to last pipeline stage |
17182 | 449 |
combinedFlags = StreamOpFlag.combineOpFlags(terminalFlags, combinedFlags); |
450 |
} |
|
451 |
||
452 |
return spliterator; |
|
453 |
} |
|
454 |
||
455 |
// PipelineHelper |
|
456 |
||
457 |
@Override |
|
18572
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
458 |
final StreamShape getSourceShape() { |
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
459 |
@SuppressWarnings("rawtypes") |
18572
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
460 |
AbstractPipeline p = AbstractPipeline.this; |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
461 |
while (p.depth > 0) { |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
462 |
p = p.previousStage; |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
463 |
} |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
464 |
return p.getOutputShape(); |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
465 |
} |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
466 |
|
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
467 |
@Override |
17182 | 468 |
final <P_IN> long exactOutputSizeIfKnown(Spliterator<P_IN> spliterator) { |
469 |
return StreamOpFlag.SIZED.isKnown(getStreamAndOpFlags()) ? spliterator.getExactSizeIfKnown() : -1; |
|
470 |
} |
|
471 |
||
472 |
@Override |
|
473 |
final <P_IN, S extends Sink<E_OUT>> S wrapAndCopyInto(S sink, Spliterator<P_IN> spliterator) { |
|
474 |
copyInto(wrapSink(Objects.requireNonNull(sink)), spliterator); |
|
475 |
return sink; |
|
476 |
} |
|
477 |
||
478 |
@Override |
|
479 |
final <P_IN> void copyInto(Sink<P_IN> wrappedSink, Spliterator<P_IN> spliterator) { |
|
480 |
Objects.requireNonNull(wrappedSink); |
|
481 |
||
482 |
if (!StreamOpFlag.SHORT_CIRCUIT.isKnown(getStreamAndOpFlags())) { |
|
483 |
wrappedSink.begin(spliterator.getExactSizeIfKnown()); |
|
484 |
spliterator.forEachRemaining(wrappedSink); |
|
485 |
wrappedSink.end(); |
|
486 |
} |
|
487 |
else { |
|
488 |
copyIntoWithCancel(wrappedSink, spliterator); |
|
489 |
} |
|
490 |
} |
|
491 |
||
492 |
@Override |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
493 |
@SuppressWarnings("unchecked") |
31644
dbca10d053fd
8071597: Add Stream dropWhile and takeWhile operations
psandoz
parents:
31248
diff
changeset
|
494 |
final <P_IN> boolean copyIntoWithCancel(Sink<P_IN> wrappedSink, Spliterator<P_IN> spliterator) { |
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
495 |
@SuppressWarnings({"rawtypes","unchecked"}) |
17182 | 496 |
AbstractPipeline p = AbstractPipeline.this; |
497 |
while (p.depth > 0) { |
|
498 |
p = p.previousStage; |
|
499 |
} |
|
31644
dbca10d053fd
8071597: Add Stream dropWhile and takeWhile operations
psandoz
parents:
31248
diff
changeset
|
500 |
|
17182 | 501 |
wrappedSink.begin(spliterator.getExactSizeIfKnown()); |
31644
dbca10d053fd
8071597: Add Stream dropWhile and takeWhile operations
psandoz
parents:
31248
diff
changeset
|
502 |
boolean cancelled = p.forEachWithCancel(spliterator, wrappedSink); |
17182 | 503 |
wrappedSink.end(); |
31644
dbca10d053fd
8071597: Add Stream dropWhile and takeWhile operations
psandoz
parents:
31248
diff
changeset
|
504 |
return cancelled; |
17182 | 505 |
} |
506 |
||
507 |
@Override |
|
508 |
final int getStreamAndOpFlags() { |
|
509 |
return combinedFlags; |
|
510 |
} |
|
511 |
||
512 |
final boolean isOrdered() { |
|
513 |
return StreamOpFlag.ORDERED.isKnown(combinedFlags); |
|
514 |
} |
|
515 |
||
516 |
@Override |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
517 |
@SuppressWarnings("unchecked") |
17182 | 518 |
final <P_IN> Sink<P_IN> wrapSink(Sink<E_OUT> sink) { |
519 |
Objects.requireNonNull(sink); |
|
520 |
||
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
521 |
for ( @SuppressWarnings("rawtypes") AbstractPipeline p=AbstractPipeline.this; p.depth > 0; p=p.previousStage) { |
17182 | 522 |
sink = p.opWrapSink(p.previousStage.combinedFlags, sink); |
523 |
} |
|
524 |
return (Sink<P_IN>) sink; |
|
525 |
} |
|
526 |
||
527 |
@Override |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
528 |
@SuppressWarnings("unchecked") |
18572
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
529 |
final <P_IN> Spliterator<E_OUT> wrapSpliterator(Spliterator<P_IN> sourceSpliterator) { |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
530 |
if (depth == 0) { |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
531 |
return (Spliterator<E_OUT>) sourceSpliterator; |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
532 |
} |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
533 |
else { |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
534 |
return wrap(this, () -> sourceSpliterator, isParallel()); |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
535 |
} |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
536 |
} |
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
537 |
|
53b8b8c30086
8012987: Optimizations for Stream.limit/substream
psandoz
parents:
17182
diff
changeset
|
538 |
@Override |
17182 | 539 |
@SuppressWarnings("unchecked") |
540 |
final <P_IN> Node<E_OUT> evaluate(Spliterator<P_IN> spliterator, |
|
541 |
boolean flatten, |
|
542 |
IntFunction<E_OUT[]> generator) { |
|
543 |
if (isParallel()) { |
|
544 |
// @@@ Optimize if op of this pipeline stage is a stateful op |
|
545 |
return evaluateToNode(this, spliterator, flatten, generator); |
|
546 |
} |
|
547 |
else { |
|
548 |
Node.Builder<E_OUT> nb = makeNodeBuilder( |
|
549 |
exactOutputSizeIfKnown(spliterator), generator); |
|
550 |
return wrapAndCopyInto(nb, spliterator).build(); |
|
551 |
} |
|
552 |
} |
|
553 |
||
554 |
||
555 |
// Shape-specific abstract methods, implemented by XxxPipeline classes |
|
556 |
||
557 |
/** |
|
558 |
* Get the output shape of the pipeline. If the pipeline is the head, |
|
559 |
* then it's output shape corresponds to the shape of the source. |
|
560 |
* Otherwise, it's output shape corresponds to the output shape of the |
|
561 |
* associated operation. |
|
562 |
* |
|
563 |
* @return the output shape |
|
564 |
*/ |
|
565 |
abstract StreamShape getOutputShape(); |
|
566 |
||
567 |
/** |
|
568 |
* Collect elements output from a pipeline into a Node that holds elements |
|
569 |
* of this shape. |
|
570 |
* |
|
571 |
* @param helper the pipeline helper describing the pipeline stages |
|
572 |
* @param spliterator the source spliterator |
|
573 |
* @param flattenTree true if the returned node should be flattened |
|
574 |
* @param generator the array generator |
|
575 |
* @return a Node holding the output of the pipeline |
|
576 |
*/ |
|
577 |
abstract <P_IN> Node<E_OUT> evaluateToNode(PipelineHelper<E_OUT> helper, |
|
578 |
Spliterator<P_IN> spliterator, |
|
579 |
boolean flattenTree, |
|
580 |
IntFunction<E_OUT[]> generator); |
|
581 |
||
582 |
/** |
|
583 |
* Create a spliterator that wraps a source spliterator, compatible with |
|
584 |
* this stream shape, and operations associated with a {@link |
|
585 |
* PipelineHelper}. |
|
586 |
* |
|
587 |
* @param ph the pipeline helper describing the pipeline stages |
|
588 |
* @param supplier the supplier of a spliterator |
|
589 |
* @return a wrapping spliterator compatible with this shape |
|
590 |
*/ |
|
591 |
abstract <P_IN> Spliterator<E_OUT> wrap(PipelineHelper<E_OUT> ph, |
|
592 |
Supplier<Spliterator<P_IN>> supplier, |
|
593 |
boolean isParallel); |
|
594 |
||
595 |
/** |
|
596 |
* Create a lazy spliterator that wraps and obtains the supplied the |
|
597 |
* spliterator when a method is invoked on the lazy spliterator. |
|
598 |
* @param supplier the supplier of a spliterator |
|
599 |
*/ |
|
600 |
abstract Spliterator<E_OUT> lazySpliterator(Supplier<? extends Spliterator<E_OUT>> supplier); |
|
601 |
||
602 |
/** |
|
603 |
* Traverse the elements of a spliterator compatible with this stream shape, |
|
604 |
* pushing those elements into a sink. If the sink requests cancellation, |
|
605 |
* no further elements will be pulled or pushed. |
|
606 |
* |
|
607 |
* @param spliterator the spliterator to pull elements from |
|
608 |
* @param sink the sink to push elements to |
|
31644
dbca10d053fd
8071597: Add Stream dropWhile and takeWhile operations
psandoz
parents:
31248
diff
changeset
|
609 |
* @return true if the cancellation was requested |
17182 | 610 |
*/ |
31644
dbca10d053fd
8071597: Add Stream dropWhile and takeWhile operations
psandoz
parents:
31248
diff
changeset
|
611 |
abstract boolean forEachWithCancel(Spliterator<E_OUT> spliterator, Sink<E_OUT> sink); |
17182 | 612 |
|
613 |
/** |
|
614 |
* Make a node builder compatible with this stream shape. |
|
615 |
* |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
616 |
* @param exactSizeIfKnown if {@literal >=0}, then a node builder will be |
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
617 |
* created that has a fixed capacity of at most sizeIfKnown elements. If |
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
618 |
* {@literal < 0}, then the node builder has an unfixed capacity. A fixed |
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
619 |
* capacity node builder will throw exceptions if an element is added after |
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
620 |
* builder has reached capacity, or is built before the builder has reached |
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
621 |
* capacity. |
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
622 |
* |
17182 | 623 |
* @param generator the array generator to be used to create instances of a |
624 |
* T[] array. For implementations supporting primitive nodes, this parameter |
|
625 |
* may be ignored. |
|
626 |
* @return a node builder |
|
627 |
*/ |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
628 |
@Override |
17182 | 629 |
abstract Node.Builder<E_OUT> makeNodeBuilder(long exactSizeIfKnown, |
630 |
IntFunction<E_OUT[]> generator); |
|
631 |
||
632 |
||
633 |
// Op-specific abstract methods, implemented by the operation class |
|
634 |
||
635 |
/** |
|
636 |
* Returns whether this operation is stateful or not. If it is stateful, |
|
637 |
* then the method |
|
638 |
* {@link #opEvaluateParallel(PipelineHelper, java.util.Spliterator, java.util.function.IntFunction)} |
|
639 |
* must be overridden. |
|
640 |
* |
|
641 |
* @return {@code true} if this operation is stateful |
|
642 |
*/ |
|
643 |
abstract boolean opIsStateful(); |
|
644 |
||
645 |
/** |
|
646 |
* Accepts a {@code Sink} which will receive the results of this operation, |
|
647 |
* and return a {@code Sink} which accepts elements of the input type of |
|
648 |
* this operation and which performs the operation, passing the results to |
|
649 |
* the provided {@code Sink}. |
|
650 |
* |
|
651 |
* @apiNote |
|
652 |
* The implementation may use the {@code flags} parameter to optimize the |
|
653 |
* sink wrapping. For example, if the input is already {@code DISTINCT}, |
|
654 |
* the implementation for the {@code Stream#distinct()} method could just |
|
655 |
* return the sink it was passed. |
|
656 |
* |
|
657 |
* @param flags The combined stream and operation flags up to, but not |
|
658 |
* including, this operation |
|
659 |
* @param sink sink to which elements should be sent after processing |
|
660 |
* @return a sink which accepts elements, perform the operation upon |
|
661 |
* each element, and passes the results (if any) to the provided |
|
662 |
* {@code Sink}. |
|
663 |
*/ |
|
664 |
abstract Sink<E_IN> opWrapSink(int flags, Sink<E_OUT> sink); |
|
665 |
||
666 |
/** |
|
667 |
* Performs a parallel evaluation of the operation using the specified |
|
668 |
* {@code PipelineHelper} which describes the upstream intermediate |
|
669 |
* operations. Only called on stateful operations. If {@link |
|
670 |
* #opIsStateful()} returns true then implementations must override the |
|
671 |
* default implementation. |
|
672 |
* |
|
673 |
* @implSpec The default implementation always throw |
|
674 |
* {@code UnsupportedOperationException}. |
|
675 |
* |
|
676 |
* @param helper the pipeline helper describing the pipeline stages |
|
677 |
* @param spliterator the source {@code Spliterator} |
|
678 |
* @param generator the array generator |
|
679 |
* @return a {@code Node} describing the result of the evaluation |
|
680 |
*/ |
|
681 |
<P_IN> Node<E_OUT> opEvaluateParallel(PipelineHelper<E_OUT> helper, |
|
682 |
Spliterator<P_IN> spliterator, |
|
683 |
IntFunction<E_OUT[]> generator) { |
|
684 |
throw new UnsupportedOperationException("Parallel evaluation is not supported"); |
|
685 |
} |
|
686 |
||
687 |
/** |
|
688 |
* Returns a {@code Spliterator} describing a parallel evaluation of the |
|
689 |
* operation, using the specified {@code PipelineHelper} which describes the |
|
690 |
* upstream intermediate operations. Only called on stateful operations. |
|
691 |
* It is not necessary (though acceptable) to do a full computation of the |
|
692 |
* result here; it is preferable, if possible, to describe the result via a |
|
693 |
* lazily evaluated spliterator. |
|
694 |
* |
|
695 |
* @implSpec The default implementation behaves as if: |
|
696 |
* <pre>{@code |
|
697 |
* return evaluateParallel(helper, i -> (E_OUT[]) new |
|
698 |
* Object[i]).spliterator(); |
|
699 |
* }</pre> |
|
700 |
* and is suitable for implementations that cannot do better than a full |
|
701 |
* synchronous evaluation. |
|
702 |
* |
|
703 |
* @param helper the pipeline helper |
|
704 |
* @param spliterator the source {@code Spliterator} |
|
705 |
* @return a {@code Spliterator} describing the result of the evaluation |
|
706 |
*/ |
|
19220
d3d40ccb544e
8022476: cleanup some raw types and unchecked warnings in java.util.stream
mduigou
parents:
18789
diff
changeset
|
707 |
@SuppressWarnings("unchecked") |
17182 | 708 |
<P_IN> Spliterator<E_OUT> opEvaluateParallelLazy(PipelineHelper<E_OUT> helper, |
709 |
Spliterator<P_IN> spliterator) { |
|
710 |
return opEvaluateParallel(helper, spliterator, i -> (E_OUT[]) new Object[i]).spliterator(); |
|
711 |
} |
|
712 |
} |