Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 1 | /* |
Brian O'Connor | 5ab426f | 2016-04-09 01:19:45 -0700 | [diff] [blame] | 2 | * Copyright 2016-present Open Networking Laboratory |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.store.primitives.resources.impl; |
| 17 | |
| 18 | import java.util.LinkedList; |
| 19 | import java.util.Queue; |
| 20 | import java.util.concurrent.CompletableFuture; |
| 21 | import java.util.function.Consumer; |
| 22 | |
Madan Jampani | 07b5448 | 2016-03-09 10:34:18 -0800 | [diff] [blame] | 23 | import org.junit.Ignore; |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 24 | import org.junit.Test; |
| 25 | |
| 26 | import static org.junit.Assert.*; |
| 27 | |
| 28 | import org.onosproject.cluster.Leadership; |
| 29 | import org.onosproject.cluster.NodeId; |
| 30 | import org.onosproject.event.Change; |
| 31 | |
| 32 | import io.atomix.Atomix; |
| 33 | import io.atomix.resource.ResourceType; |
| 34 | |
| 35 | /** |
| 36 | * Unit tests for {@link AtomixLeaderElector}. |
| 37 | */ |
Madan Jampani | 07b5448 | 2016-03-09 10:34:18 -0800 | [diff] [blame] | 38 | @Ignore |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 39 | public class AtomixLeaderElectorTest extends AtomixTestBase { |
| 40 | |
| 41 | NodeId node1 = new NodeId("node1"); |
| 42 | NodeId node2 = new NodeId("node2"); |
| 43 | NodeId node3 = new NodeId("node3"); |
| 44 | |
| 45 | @Override |
| 46 | protected ResourceType resourceType() { |
| 47 | return new ResourceType(AtomixLeaderElector.class); |
| 48 | } |
| 49 | |
| 50 | @Test |
| 51 | public void testRun() throws Throwable { |
| 52 | leaderElectorRunTests(1); |
| 53 | clearTests(); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 54 | leaderElectorRunTests(2); |
| 55 | clearTests(); |
| 56 | leaderElectorRunTests(3); |
| 57 | clearTests(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | private void leaderElectorRunTests(int numServers) throws Throwable { |
| 61 | createCopycatServers(numServers); |
| 62 | Atomix client1 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 63 | AtomixLeaderElector elector1 = client1.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 64 | elector1.run("foo", node1).thenAccept(result -> { |
| 65 | assertEquals(node1, result.leaderNodeId()); |
| 66 | assertEquals(1, result.leader().term()); |
| 67 | assertEquals(1, result.candidates().size()); |
| 68 | assertEquals(node1, result.candidates().get(0)); |
| 69 | }).join(); |
| 70 | Atomix client2 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 71 | AtomixLeaderElector elector2 = client2.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 72 | elector2.run("foo", node2).thenAccept(result -> { |
| 73 | assertEquals(node1, result.leaderNodeId()); |
| 74 | assertEquals(1, result.leader().term()); |
| 75 | assertEquals(2, result.candidates().size()); |
| 76 | assertEquals(node1, result.candidates().get(0)); |
| 77 | assertEquals(node2, result.candidates().get(1)); |
| 78 | }).join(); |
| 79 | } |
| 80 | |
| 81 | @Test |
| 82 | public void testWithdraw() throws Throwable { |
| 83 | leaderElectorWithdrawTests(1); |
| 84 | clearTests(); |
| 85 | leaderElectorWithdrawTests(2); |
| 86 | clearTests(); |
| 87 | leaderElectorWithdrawTests(3); |
| 88 | clearTests(); |
| 89 | } |
| 90 | |
| 91 | private void leaderElectorWithdrawTests(int numServers) throws Throwable { |
| 92 | createCopycatServers(numServers); |
| 93 | Atomix client1 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 94 | AtomixLeaderElector elector1 = client1.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 95 | elector1.run("foo", node1).join(); |
| 96 | Atomix client2 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 97 | AtomixLeaderElector elector2 = client2.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 98 | elector2.run("foo", node2).join(); |
| 99 | |
| 100 | LeaderEventListener listener1 = new LeaderEventListener(); |
| 101 | elector1.addChangeListener(listener1).join(); |
| 102 | |
| 103 | LeaderEventListener listener2 = new LeaderEventListener(); |
| 104 | elector2.addChangeListener(listener2).join(); |
| 105 | |
| 106 | elector1.withdraw("foo").join(); |
| 107 | |
| 108 | listener1.nextEvent().thenAccept(result -> { |
| 109 | assertEquals(node2, result.newValue().leaderNodeId()); |
| 110 | assertEquals(2, result.newValue().leader().term()); |
| 111 | assertEquals(1, result.newValue().candidates().size()); |
| 112 | assertEquals(node2, result.newValue().candidates().get(0)); |
| 113 | }).join(); |
| 114 | |
| 115 | listener2.nextEvent().thenAccept(result -> { |
| 116 | assertEquals(node2, result.newValue().leaderNodeId()); |
| 117 | assertEquals(2, result.newValue().leader().term()); |
| 118 | assertEquals(1, result.newValue().candidates().size()); |
| 119 | assertEquals(node2, result.newValue().candidates().get(0)); |
| 120 | }).join(); |
| 121 | } |
| 122 | |
| 123 | @Test |
| 124 | public void testAnoint() throws Throwable { |
| 125 | leaderElectorAnointTests(1); |
| 126 | clearTests(); |
| 127 | leaderElectorAnointTests(2); |
| 128 | clearTests(); |
| 129 | leaderElectorAnointTests(3); |
| 130 | clearTests(); |
| 131 | } |
| 132 | |
| 133 | private void leaderElectorAnointTests(int numServers) throws Throwable { |
| 134 | createCopycatServers(numServers); |
| 135 | Atomix client1 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 136 | AtomixLeaderElector elector1 = client1.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 137 | Atomix client2 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 138 | AtomixLeaderElector elector2 = client2.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 139 | Atomix client3 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 140 | AtomixLeaderElector elector3 = client3.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 141 | elector1.run("foo", node1).join(); |
| 142 | elector2.run("foo", node2).join(); |
| 143 | |
| 144 | LeaderEventListener listener1 = new LeaderEventListener(); |
| 145 | elector1.addChangeListener(listener1).join(); |
| 146 | LeaderEventListener listener2 = new LeaderEventListener(); |
| 147 | elector2.addChangeListener(listener2); |
| 148 | LeaderEventListener listener3 = new LeaderEventListener(); |
| 149 | elector3.addChangeListener(listener3).join(); |
| 150 | |
| 151 | elector3.anoint("foo", node3).thenAccept(result -> { |
| 152 | assertFalse(result); |
| 153 | }).join(); |
| 154 | assertFalse(listener1.hasEvent()); |
| 155 | assertFalse(listener2.hasEvent()); |
| 156 | assertFalse(listener3.hasEvent()); |
| 157 | |
| 158 | elector3.anoint("foo", node2).thenAccept(result -> { |
| 159 | assertTrue(result); |
| 160 | }).join(); |
| 161 | assertTrue(listener1.hasEvent()); |
| 162 | assertTrue(listener2.hasEvent()); |
| 163 | assertTrue(listener3.hasEvent()); |
| 164 | |
| 165 | listener1.nextEvent().thenAccept(result -> { |
| 166 | assertEquals(node2, result.newValue().leaderNodeId()); |
| 167 | assertEquals(2, result.newValue().candidates().size()); |
| 168 | assertEquals(node1, result.newValue().candidates().get(0)); |
| 169 | assertEquals(node2, result.newValue().candidates().get(1)); |
| 170 | }).join(); |
| 171 | listener2.nextEvent().thenAccept(result -> { |
| 172 | assertEquals(node2, result.newValue().leaderNodeId()); |
| 173 | assertEquals(2, result.newValue().candidates().size()); |
| 174 | assertEquals(node1, result.newValue().candidates().get(0)); |
| 175 | assertEquals(node2, result.newValue().candidates().get(1)); |
| 176 | }).join(); |
| 177 | listener3.nextEvent().thenAccept(result -> { |
| 178 | assertEquals(node2, result.newValue().leaderNodeId()); |
| 179 | assertEquals(2, result.newValue().candidates().size()); |
| 180 | assertEquals(node1, result.newValue().candidates().get(0)); |
| 181 | assertEquals(node2, result.newValue().candidates().get(1)); |
| 182 | }).join(); |
| 183 | } |
| 184 | |
| 185 | @Test |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 186 | public void testPromote() throws Throwable { |
| 187 | leaderElectorPromoteTests(1); |
| 188 | clearTests(); |
| 189 | leaderElectorPromoteTests(2); |
| 190 | clearTests(); |
| 191 | leaderElectorPromoteTests(3); |
| 192 | clearTests(); |
| 193 | } |
| 194 | |
| 195 | private void leaderElectorPromoteTests(int numServers) throws Throwable { |
| 196 | createCopycatServers(numServers); |
| 197 | Atomix client1 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 198 | AtomixLeaderElector elector1 = client1.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 199 | Atomix client2 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 200 | AtomixLeaderElector elector2 = client2.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 201 | Atomix client3 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 202 | AtomixLeaderElector elector3 = client3.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 203 | elector1.run("foo", node1).join(); |
| 204 | elector2.run("foo", node2).join(); |
| 205 | |
| 206 | LeaderEventListener listener1 = new LeaderEventListener(); |
| 207 | elector1.addChangeListener(listener1).join(); |
| 208 | LeaderEventListener listener2 = new LeaderEventListener(); |
| 209 | elector2.addChangeListener(listener2).join(); |
| 210 | LeaderEventListener listener3 = new LeaderEventListener(); |
| 211 | elector3.addChangeListener(listener3).join(); |
| 212 | |
| 213 | elector3.promote("foo", node3).thenAccept(result -> { |
| 214 | assertFalse(result); |
| 215 | }).join(); |
| 216 | |
| 217 | assertFalse(listener1.hasEvent()); |
| 218 | assertFalse(listener2.hasEvent()); |
| 219 | assertFalse(listener3.hasEvent()); |
| 220 | |
| 221 | elector3.run("foo", node3).join(); |
| 222 | |
| 223 | listener1.clearEvents(); |
| 224 | listener2.clearEvents(); |
| 225 | listener3.clearEvents(); |
| 226 | |
| 227 | elector3.promote("foo", node3).thenAccept(result -> { |
| 228 | assertTrue(result); |
| 229 | }).join(); |
| 230 | |
| 231 | listener1.nextEvent().thenAccept(result -> { |
| 232 | assertEquals(node3, result.newValue().candidates().get(0)); |
| 233 | }).join(); |
| 234 | listener2.nextEvent().thenAccept(result -> { |
| 235 | assertEquals(node3, result.newValue().candidates().get(0)); |
| 236 | }).join(); |
| 237 | listener3.nextEvent().thenAccept(result -> { |
| 238 | assertEquals(node3, result.newValue().candidates().get(0)); |
| 239 | }).join(); |
| 240 | } |
| 241 | |
| 242 | @Test |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 243 | public void testLeaderSessionClose() throws Throwable { |
| 244 | leaderElectorLeaderSessionCloseTests(1); |
| 245 | clearTests(); |
| 246 | leaderElectorLeaderSessionCloseTests(2); |
| 247 | clearTests(); |
| 248 | leaderElectorLeaderSessionCloseTests(3); |
| 249 | clearTests(); |
| 250 | } |
| 251 | |
| 252 | private void leaderElectorLeaderSessionCloseTests(int numServers) throws Throwable { |
| 253 | createCopycatServers(numServers); |
| 254 | Atomix client1 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 255 | AtomixLeaderElector elector1 = client1.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 256 | elector1.run("foo", node1).join(); |
| 257 | Atomix client2 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 258 | AtomixLeaderElector elector2 = client2.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 259 | LeaderEventListener listener = new LeaderEventListener(); |
| 260 | elector2.run("foo", node2).join(); |
| 261 | elector2.addChangeListener(listener).join(); |
| 262 | client1.close(); |
| 263 | listener.nextEvent().thenAccept(result -> { |
| 264 | assertEquals(node2, result.newValue().leaderNodeId()); |
| 265 | assertEquals(1, result.newValue().candidates().size()); |
| 266 | assertEquals(node2, result.newValue().candidates().get(0)); |
| 267 | }).join(); |
| 268 | } |
| 269 | |
| 270 | @Test |
| 271 | public void testNonLeaderSessionClose() throws Throwable { |
| 272 | leaderElectorNonLeaderSessionCloseTests(1); |
| 273 | clearTests(); |
| 274 | leaderElectorNonLeaderSessionCloseTests(2); |
| 275 | clearTests(); |
| 276 | leaderElectorNonLeaderSessionCloseTests(3); |
| 277 | clearTests(); |
| 278 | } |
| 279 | |
| 280 | private void leaderElectorNonLeaderSessionCloseTests(int numServers) throws Throwable { |
| 281 | createCopycatServers(numServers); |
| 282 | Atomix client1 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 283 | AtomixLeaderElector elector1 = client1.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 284 | elector1.run("foo", node1).join(); |
| 285 | Atomix client2 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 286 | AtomixLeaderElector elector2 = client2.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 287 | LeaderEventListener listener = new LeaderEventListener(); |
| 288 | elector2.run("foo", node2).join(); |
| 289 | elector1.addChangeListener(listener).join(); |
| 290 | client2.close().join(); |
| 291 | listener.nextEvent().thenAccept(result -> { |
| 292 | assertEquals(node1, result.newValue().leaderNodeId()); |
| 293 | assertEquals(1, result.newValue().candidates().size()); |
| 294 | assertEquals(node1, result.newValue().candidates().get(0)); |
| 295 | }).join(); |
| 296 | } |
| 297 | |
| 298 | @Test |
| 299 | public void testQueries() throws Throwable { |
| 300 | leaderElectorQueryTests(1); |
| 301 | clearTests(); |
| 302 | leaderElectorQueryTests(2); |
| 303 | clearTests(); |
| 304 | leaderElectorQueryTests(3); |
| 305 | clearTests(); |
| 306 | } |
| 307 | |
| 308 | private void leaderElectorQueryTests(int numServers) throws Throwable { |
| 309 | createCopycatServers(numServers); |
| 310 | Atomix client1 = createAtomixClient(); |
| 311 | Atomix client2 = createAtomixClient(); |
Madan Jampani | 65f24bb | 2016-03-15 15:16:18 -0700 | [diff] [blame] | 312 | AtomixLeaderElector elector1 = client1.getResource("test-elector", AtomixLeaderElector.class).join(); |
| 313 | AtomixLeaderElector elector2 = client2.getResource("test-elector", AtomixLeaderElector.class).join(); |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 314 | elector1.run("foo", node1).join(); |
| 315 | elector2.run("foo", node2).join(); |
| 316 | elector2.run("bar", node2).join(); |
| 317 | elector1.getElectedTopics(node1).thenAccept(result -> { |
| 318 | assertEquals(1, result.size()); |
| 319 | assertTrue(result.contains("foo")); |
| 320 | }).join(); |
| 321 | elector2.getElectedTopics(node1).thenAccept(result -> { |
| 322 | assertEquals(1, result.size()); |
| 323 | assertTrue(result.contains("foo")); |
| 324 | }).join(); |
| 325 | elector1.getLeadership("foo").thenAccept(result -> { |
| 326 | assertEquals(node1, result.leaderNodeId()); |
| 327 | assertEquals(node1, result.candidates().get(0)); |
| 328 | assertEquals(node2, result.candidates().get(1)); |
| 329 | }).join(); |
| 330 | elector2.getLeadership("foo").thenAccept(result -> { |
| 331 | assertEquals(node1, result.leaderNodeId()); |
| 332 | assertEquals(node1, result.candidates().get(0)); |
| 333 | assertEquals(node2, result.candidates().get(1)); |
| 334 | }).join(); |
| 335 | elector1.getLeadership("bar").thenAccept(result -> { |
| 336 | assertEquals(node2, result.leaderNodeId()); |
| 337 | assertEquals(node2, result.candidates().get(0)); |
| 338 | }).join(); |
| 339 | elector2.getLeadership("bar").thenAccept(result -> { |
| 340 | assertEquals(node2, result.leaderNodeId()); |
| 341 | assertEquals(node2, result.candidates().get(0)); |
| 342 | }).join(); |
| 343 | elector1.getLeaderships().thenAccept(result -> { |
| 344 | assertEquals(2, result.size()); |
| 345 | Leadership fooLeadership = result.get("foo"); |
| 346 | assertEquals(node1, fooLeadership.leaderNodeId()); |
| 347 | assertEquals(node1, fooLeadership.candidates().get(0)); |
| 348 | assertEquals(node2, fooLeadership.candidates().get(1)); |
| 349 | Leadership barLeadership = result.get("bar"); |
| 350 | assertEquals(node2, barLeadership.leaderNodeId()); |
| 351 | assertEquals(node2, barLeadership.candidates().get(0)); |
| 352 | }).join(); |
| 353 | elector2.getLeaderships().thenAccept(result -> { |
| 354 | assertEquals(2, result.size()); |
| 355 | Leadership fooLeadership = result.get("foo"); |
| 356 | assertEquals(node1, fooLeadership.leaderNodeId()); |
| 357 | assertEquals(node1, fooLeadership.candidates().get(0)); |
| 358 | assertEquals(node2, fooLeadership.candidates().get(1)); |
| 359 | Leadership barLeadership = result.get("bar"); |
| 360 | assertEquals(node2, barLeadership.leaderNodeId()); |
| 361 | assertEquals(node2, barLeadership.candidates().get(0)); |
| 362 | }).join(); |
| 363 | } |
| 364 | |
| 365 | private static class LeaderEventListener implements Consumer<Change<Leadership>> { |
| 366 | Queue<Change<Leadership>> eventQueue = new LinkedList<>(); |
| 367 | CompletableFuture<Change<Leadership>> pendingFuture; |
| 368 | |
| 369 | @Override |
| 370 | public void accept(Change<Leadership> change) { |
| 371 | synchronized (this) { |
| 372 | if (pendingFuture != null) { |
| 373 | pendingFuture.complete(change); |
| 374 | pendingFuture = null; |
| 375 | } else { |
| 376 | eventQueue.add(change); |
| 377 | } |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | public boolean hasEvent() { |
| 382 | return !eventQueue.isEmpty(); |
| 383 | } |
| 384 | |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 385 | public void clearEvents() { |
| 386 | eventQueue.clear(); |
| 387 | } |
| 388 | |
Madan Jampani | 5e5b3d6 | 2016-02-01 16:03:33 -0800 | [diff] [blame] | 389 | public CompletableFuture<Change<Leadership>> nextEvent() { |
| 390 | synchronized (this) { |
| 391 | if (eventQueue.isEmpty()) { |
| 392 | if (pendingFuture == null) { |
| 393 | pendingFuture = new CompletableFuture<>(); |
| 394 | } |
| 395 | return pendingFuture; |
| 396 | } else { |
| 397 | return CompletableFuture.completedFuture(eventQueue.poll()); |
| 398 | } |
| 399 | } |
| 400 | } |
| 401 | } |
| 402 | } |