| /* |
| * 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.asterix.transaction.management.service.locking; |
| |
| import java.io.PrintStream; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.asterix.common.exceptions.ACIDException; |
| import org.apache.asterix.common.transactions.ILockManager; |
| import org.apache.asterix.common.transactions.ITransactionContext; |
| import org.junit.Assert; |
| |
| /** |
| * Executes a sequence of lock requests against an ILockManager. |
| * Lockers are run by different threads in the LockManagerUnitTest. |
| * |
| * @see ILockManager |
| * @see LockManagerUnitTest |
| */ |
| class Locker implements Runnable { |
| |
| public String name; |
| |
| private ILockManager lockMgr; |
| |
| private List<Requester> requests; |
| private Iterator<Requester> reqIter; |
| private volatile Requester curReq; |
| private int reqStart; |
| |
| private AtomicInteger globalTime; |
| private List<Throwable> errors; |
| |
| private PrintStream err; |
| |
| /** |
| * @param lockMgr |
| * the ILockManager to send requests to |
| * @param txnCtx |
| * the ITransactionContext that identifies the transaction that this Locker represents |
| * @param allRequests |
| * an ordered list of lock requests for multiple transactions, this Locker will only execute |
| * requests for the transaction identified by txnCtx |
| * @param time |
| * a global timestamp that is used to synchronize different lockers to ensure that requests are started |
| * in the order given in allRequests |
| * @param err |
| * a stream to write log/error information to |
| * @see Request |
| */ |
| Locker(ILockManager lockMgr, ITransactionContext txnCtx, List<Request> allRequests, AtomicInteger time, |
| PrintStream err) { |
| this.name = txnCtx == null ? "admin" : txnCtx.getJobId().toString(); |
| this.lockMgr = lockMgr; |
| |
| this.requests = new LinkedList<>(); |
| for (int pos = 0; pos < allRequests.size(); ++pos) { |
| Request req = allRequests.get(pos); |
| if (req.txnCtx == txnCtx) { |
| requests.add(new Requester(pos, req)); |
| } |
| } |
| this.reqIter = requests.iterator(); |
| this.globalTime = time; |
| this.err = err; |
| } |
| |
| private boolean hasErrors() { |
| return errors != null && errors.size() > 0; |
| } |
| |
| synchronized List<Throwable> getErrors() { |
| return errors; |
| } |
| |
| private synchronized void addError(Throwable error) { |
| log("caught " + error); |
| if (this.errors == null) { |
| this.errors = Collections.synchronizedList(new ArrayList<Throwable>()); |
| } |
| this.errors.add(error); |
| } |
| |
| public synchronized boolean active() { |
| return !hasErrors() && (reqIter.hasNext() || curReq != null); |
| } |
| |
| public synchronized boolean timedOut() { |
| return reqStart > 0 && (currentTime() - reqStart) > LockManagerUnitTest.TIMEOUT_MS; |
| } |
| |
| @Override |
| public void run() { |
| log("running"); |
| try { |
| while (!hasErrors() && reqIter.hasNext()) { |
| curReq = reqIter.next(); |
| int localTime = globalTime.get(); |
| while (localTime < curReq.time) { |
| Thread.sleep(10); |
| localTime = globalTime.get(); |
| } |
| if (localTime != curReq.time) { |
| throw new AssertionError("missed time for request " + curReq); |
| } |
| log("will exec at t=" + localTime + " " + curReq); |
| try { |
| reqStart = currentTime(); |
| Assert.assertEquals(localTime, globalTime.get()); |
| curReq.setResult(curReq.request.execute(lockMgr) ? Requester.SUCCESS : Requester.FAIL); |
| } catch (ACIDException e) { |
| curReq.setResult(Requester.ERROR); |
| addError(e); |
| } finally { |
| globalTime.getAndIncrement(); |
| log("incremented"); |
| reqStart = -1; |
| } |
| log("time " + localTime); |
| } |
| curReq = null; |
| } catch (InterruptedException ie) { |
| log("got interrupted"); |
| } catch (Throwable e) { |
| if (err != null) { |
| e.printStackTrace(err); |
| } |
| addError(e); |
| } |
| log("done"); |
| } |
| |
| private void log(String msg) { |
| if (err != null) { |
| err.println(Thread.currentThread().getName() + " " + msg); |
| } |
| } |
| |
| private static int currentTime() { |
| return ((int) System.currentTimeMillis()) & 0x7fffffff; |
| } |
| |
| public String toString() { |
| return "[" + name + "]" + curReq; |
| } |
| } |
| |
| class Requester { |
| |
| public static byte NONE = -1; |
| public static byte FAIL = 0; |
| public static byte SUCCESS = 1; |
| public static byte ERROR = 2; |
| |
| int time; |
| Request request; |
| byte result = NONE; |
| |
| Requester(int time, Request request) { |
| this.time = time; |
| this.request = request; |
| } |
| |
| void setResult(byte res) { |
| result = res; |
| } |
| |
| public String toString() { |
| return request.toString() + " t=" + time; |
| } |
| } |