content: /*
   * 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.transaction;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.concurrent.atomic.AtomicLong;
  import java.util.concurrent.locks.ReentrantLock;
  
  import org.apache.asterix.common.context.ITransactionOperationTracker;
  import org.apache.asterix.common.exceptions.ACIDException;
  import org.apache.asterix.common.transactions.ITransactionContext;
  import org.apache.asterix.common.transactions.ITransactionManager;
  import org.apache.asterix.common.transactions.TxnId;
  import org.apache.hyracks.storage.am.lsm.common.api.ILSMIndex;
  import org.apache.hyracks.storage.common.IModificationOperationCallback;
  import org.apache.hyracks.util.annotations.ThreadSafe;
  
  @ThreadSafe
  public abstract class AbstractTransactionContext implements ITransactionContext {
  
      protected final TxnId txnId;
      private final Map<Long, ITransactionOperationTracker> txnOpTrackers;
      private final AtomicLong firstLSN;
      private final AtomicLong lastLSN;
      private final AtomicInteger txnState;
      private final AtomicBoolean isWriteTxn;
      private volatile boolean isTimeout;
      private ReentrantLock exclusiveLock;
  
      protected AbstractTransactionContext(TxnId txnId) {
          this.txnId = txnId;
          firstLSN = new AtomicLong(-1);
          lastLSN = new AtomicLong(-1);
          txnState = new AtomicInteger(ITransactionManager.ACTIVE);
          isTimeout = false;
          isWriteTxn = new AtomicBoolean();
          txnOpTrackers = new HashMap<>();
      }
  
      @Override
      public long getFirstLSN() {
          return firstLSN.get();
      }
  
      @Override
      public void setLastLSN(long newValue) {
          firstLSN.compareAndSet(-1, newValue);
          lastLSN.set(Math.max(lastLSN.get(), newValue));
      }
  
      @Override
      public void setTxnState(int txnState) {
          this.txnState.set(txnState);
      }
  
      @Override
      public int getTxnState() {
          return txnState.get();
      }
  
      @Override
      public TxnId getTxnId() {
          return txnId;
      }
  
      @Override
      public void setTimeout(boolean isTimeout) {
          this.isTimeout = isTimeout;
      }
  
      @Override
      public boolean isTimeout() {
          return isTimeout;
      }
  
      @Override
      public void acquireExclusiveWriteLock(ReentrantLock exclusiveLock) {
          if (isWriteTxn.get()) {
              return;
          }
          try {
              exclusiveLock.lockInterruptibly();
              this.exclusiveLock = exclusiveLock;
              setWriteTxn(true);
          } catch (InterruptedException e) {
              Thread.currentThread().interrupt();
              throw new ACIDException(e);
          }
      }
  
      @Override
      public void setWriteTxn(boolean isWriteTxn) {
          this.isWriteTxn.set(isWriteTxn);
      }
  
      @Override
      public boolean isWriteTxn() {
          return isWriteTxn.get();
      }
  
      @Override
      public long getLastLSN() {
          return lastLSN.get();
      }
  
      @Override
      public void complete() {
          try {
              if (isWriteTxn()) {
                  cleanup();
              }
          } finally {
              synchronized (txnOpTrackers) {
                  txnOpTrackers.forEach((resource, opTracker) -> opTracker.afterTransaction(resource));
              }
              if (exclusiveLock != null) {
                  exclusiveLock.unlock();
              }
          }
      }
  
      @Override
      public void register(long resourceId, int partition, ILSMIndex index, IModificationOperationCallback callback,
              boolean primaryIndex) {
          synchronized (txnOpTrackers) {
              if (!txnOpTrackers.containsKey(resourceId)) {
                  final ITransactionOperationTracker txnOpTracker =
                          (ITransactionOperationTracker) index.getOperationTracker();
                  txnOpTrackers.put(resourceId, txnOpTracker);
                  txnOpTracker.beforeTransaction(resourceId);
              }
          }
      }
  
      public String prettyPrint() {
          StringBuilder sb = new StringBuilder();
          sb.append("\n" + txnId + "\n");
          sb.append("isWriteTxn: " + isWriteTxn + "\n");
          sb.append("firstLSN: " + firstLSN.get() + "\n");
          sb.append("lastLSN: " + lastLSN.get() + "\n");
          sb.append("TransactionState: " + txnState + "\n");
          sb.append("isTimeout: " + isTimeout + "\n");
          return sb.toString();
      }
  
      protected abstract void cleanup();
  }
  