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.locking;
  
  import java.io.PrintStream;
  
  import org.apache.asterix.common.exceptions.ACIDException;
  import org.apache.asterix.common.transactions.DatasetId;
  import org.apache.asterix.common.transactions.ILockManager;
  import org.apache.asterix.common.transactions.ITransactionContext;
  import org.apache.asterix.transaction.management.service.transaction.TransactionManagementConstants;
  
  /**
   * repesents a lock request for testing.
   */
  abstract class Request {
      /** the kind of a request */
      enum Kind {
          /** requests an instant-try-lock */
          INSTANT_TRY_LOCK,
          /** requests an instant-lock */
          INSTANT_LOCK,
          /** requests a lock */
          LOCK,
          /** prints a JSON representation of the lock table by entity */
          PRINT,
          /** releases all locks */
          RELEASE,
          /** requests a try-lock */
          TRY_LOCK,
          /** unlocks a lock */
          UNLOCK
      }
  
      Kind kind;
      ITransactionContext txnCtx;
  
      Request(Kind kind, ITransactionContext txnCtx) {
          this.kind = kind;
          this.txnCtx = txnCtx;
      }
  
      String asString(final Kind kind, final ITransactionContext txnCtx, final DatasetId dsId, final int hashValue,
              final byte lockMode) {
          return txnCtx.getTxnId() + ":" + kind.name() + ":" + dsId.getId() + ":" + hashValue + ":"
                  + TransactionManagementConstants.LockManagerConstants.LockMode.toString(lockMode);
      }
  
      abstract boolean execute(ILockManager lockMgr) throws ACIDException;
  
      static Request create(final Kind kind, final ITransactionContext txnCtx, final DatasetId dsId, final int hashValue,
              final byte lockMode) {
  
          switch (kind) {
              case INSTANT_TRY_LOCK:
                  return new Request(kind, txnCtx) {
                      @Override
                      boolean execute(ILockManager lockMgr) throws ACIDException {
                          return lockMgr.instantTryLock(dsId, hashValue, lockMode, txnCtx);
                      }
  
                      @Override
                      public String toString() {
                          return asString(kind, txnCtx, dsId, hashValue, lockMode);
                      }
                  };
              case INSTANT_LOCK:
                  return new Request(kind, txnCtx) {
                      @Override
                      boolean execute(ILockManager lockMgr) throws ACIDException {
                          lockMgr.instantLock(dsId, hashValue, lockMode, txnCtx);
                          return true;
                      }
  
                      @Override
                      public String toString() {
                          return asString(kind, txnCtx, dsId, hashValue, lockMode);
                      }
                  };
              case LOCK:
                  return new Request(kind, txnCtx) {
                      @Override
                      boolean execute(ILockManager lockMgr) throws ACIDException {
                          lockMgr.lock(dsId, hashValue, lockMode, txnCtx);
                          return true;
                      }
  
                      @Override
                      public String toString() {
                          return asString(kind, txnCtx, dsId, hashValue, lockMode);
                      }
                  };
              case TRY_LOCK:
                  return new Request(kind, txnCtx) {
                      @Override
                      boolean execute(ILockManager lockMgr) throws ACIDException {
                          return lockMgr.tryLock(dsId, hashValue, lockMode, txnCtx);
                      }
  
                      @Override
                      public String toString() {
                          return asString(kind, txnCtx, dsId, hashValue, lockMode);
                      }
                  };
              case UNLOCK:
                  return new Request(kind, txnCtx) {
                      @Override
                      boolean execute(ILockManager lockMgr) throws ACIDException {
                          lockMgr.unlock(dsId, hashValue, lockMode, txnCtx);
                          return true;
                      }
  
                      @Override
                      public String toString() {
                          return asString(kind, txnCtx, dsId, hashValue, lockMode);
                      }
                  };
              default:
          }
          throw new AssertionError("Illegal Request Kind " + kind);
      }
  
      static Request create(final Kind kind, final ITransactionContext txnCtx) {
          if (kind == Kind.RELEASE) {
              return new Request(kind, txnCtx) {
                  @Override
                  boolean execute(ILockManager lockMgr) throws ACIDException {
                      lockMgr.releaseLocks(txnCtx);
                      return true;
                  }
  
                  @Override
                  public String toString() {
                      return txnCtx.getTxnId().toString() + ":" + kind.name();
                  }
              };
          }
          throw new AssertionError("Illegal Request Kind " + kind);
      }
  
      static Request create(final Kind kind, final PrintStream out) {
          if (kind == Kind.PRINT) {
              return new Request(kind, null) {
                  @Override
                  boolean execute(ILockManager lockMgr) throws ACIDException {
                      if (out == null) {
                          return false;
                      }
                      if (!(lockMgr instanceof ConcurrentLockManager)) {
                          out.print("cannot print");
                          return false;
                      }
                      out.print(((ConcurrentLockManager) lockMgr).printByResource());
                      return true;
                  }
  
                  @Override
                  public String toString() {
                      return kind.name();
                  }
              };
          }
          throw new AssertionError("Illegal Request Kind " + kind);
      }
  }
  