| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.omid.tso.client; |
| |
| import org.apache.phoenix.thirdparty.com.google.common.util.concurrent.SettableFuture; |
| |
| import org.apache.omid.committable.CommitTable; |
| |
| import java.io.IOException; |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.Map; |
| import java.util.HashMap; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| // TODO Would be nice to compile all util classes for testing to a separate package that clients could import for tests |
| public class MockTSOClient implements TSOProtocol { |
| |
| private static final int CONFLICT_MAP_SIZE = 1_000_000; |
| |
| private final AtomicLong timestampGenerator = new AtomicLong(); |
| private final long[] conflictMap = new long[CONFLICT_MAP_SIZE]; |
| private final Map<Long, Long> fenceMap = new HashMap<Long, Long>(); |
| private final AtomicLong lwm = new AtomicLong(); |
| |
| private final CommitTable.Writer commitTable; |
| |
| public MockTSOClient(CommitTable.Writer commitTable) { |
| this.commitTable = commitTable; |
| } |
| |
| @Override |
| public TSOFuture<Long> getNewStartTimestamp() { |
| synchronized (conflictMap) { |
| SettableFuture<Long> f = SettableFuture.create(); |
| f.set(timestampGenerator.incrementAndGet()); |
| return new ForwardingTSOFuture<>(f); |
| } |
| } |
| |
| @Override |
| public TSOFuture<Long> getFence(long tableId) { |
| synchronized (conflictMap) { |
| SettableFuture<Long> f = SettableFuture.create(); |
| long fenceTimestamp = timestampGenerator.incrementAndGet(); |
| f.set(fenceTimestamp); |
| fenceMap.put(tableId, fenceTimestamp); |
| try { |
| // Persist the fence by using the fence identifier as both the start and commit timestamp. |
| commitTable.addCommittedTransaction(fenceTimestamp, fenceTimestamp); |
| commitTable.flush(); |
| } catch (IOException ioe) { |
| f.setException(ioe); |
| } |
| return new ForwardingTSOFuture<>(f); |
| } |
| } |
| |
| // Checks whether transaction transactionId started before a fence creation of a table transactionId modified. |
| private boolean hasConflictsWithFences(long transactionId, Set<? extends CellId> cells) { |
| Set<Long> tableIDs = new HashSet<Long>(); |
| for (CellId c : cells) { |
| tableIDs.add(c.getTableId()); |
| } |
| |
| if (! fenceMap.isEmpty()) { |
| for (long tableId : tableIDs) { |
| Long fence = fenceMap.get(tableId); |
| if (fence != null && transactionId < fence) { |
| return true; |
| } |
| if (fence != null && fence < lwm.get()) { // GC |
| fenceMap.remove(tableId); |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| // Checks whether transactionId has a write-write conflict with a transaction committed after transactionId. |
| private boolean hasConflictsWithCommittedTransactions(long transactionId, Set<? extends CellId> cells) { |
| for (CellId c : cells) { |
| int index = Math.abs((int) (c.getCellId() % CONFLICT_MAP_SIZE)); |
| if (conflictMap[index] >= transactionId) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| @Override |
| public TSOFuture<Long> commit(long transactionId, Set<? extends CellId> cells, Set<? extends CellId> conflictFreeWriteSet) { |
| return commit(transactionId, cells); |
| } |
| |
| @Override |
| public TSOFuture<Long> commit(long transactionId, Set<? extends CellId> cells) { |
| synchronized (conflictMap) { |
| SettableFuture<Long> f = SettableFuture.create(); |
| if (transactionId < lwm.get()) { |
| f.setException(new AbortException()); |
| return new ForwardingTSOFuture<>(f); |
| } |
| |
| if (!hasConflictsWithFences(transactionId, cells) && |
| !hasConflictsWithCommittedTransactions(transactionId, cells)) { |
| |
| long commitTimestamp = timestampGenerator.incrementAndGet(); |
| for (CellId c : cells) { |
| int index = Math.abs((int) (c.getCellId() % CONFLICT_MAP_SIZE)); |
| long oldVal = conflictMap[index]; |
| conflictMap[index] = commitTimestamp; |
| long curLwm = lwm.get(); |
| while (oldVal > curLwm) { |
| if (lwm.compareAndSet(curLwm, oldVal)) { |
| break; |
| } |
| curLwm = lwm.get(); |
| } |
| } |
| |
| f.set(commitTimestamp); |
| try { |
| commitTable.addCommittedTransaction(transactionId, commitTimestamp); |
| commitTable.updateLowWatermark(lwm.get()); |
| commitTable.flush(); |
| } catch (IOException ioe) { |
| f.setException(ioe); |
| } |
| } else { |
| f.setException(new AbortException()); |
| } |
| return new ForwardingTSOFuture<>(f); |
| } |
| } |
| |
| @Override |
| public TSOFuture<Void> close() { |
| SettableFuture<Void> f = SettableFuture.create(); |
| f.set(null); |
| return new ForwardingTSOFuture<>(f); |
| } |
| |
| @Override |
| public boolean isLowLatency() { |
| return false; |
| } |
| |
| @Override |
| public void setConflictDetectionLevel(OmidClientConfiguration.ConflictDetectionLevel conflictDetectionLevel) { |
| |
| } |
| |
| @Override |
| public OmidClientConfiguration.ConflictDetectionLevel getConflictDetectionLevel() { |
| return null; |
| } |
| |
| @Override |
| public long getEpoch() { |
| return 0; |
| } |
| } |