org.apache.activemq.artemis.core.transaction.impl.XidImpl Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/**
 * 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.activemq.artemis.core.transaction.impl;

import java.io.Serializable;
import java.util.Arrays;

import javax.transaction.xa.Xid;

import org.apache.activemq.artemis.utils.Base64;

/**
 * Xid implementation
 */
public class XidImpl implements Xid, Serializable
{
   private static final long serialVersionUID = 407053232840068514L;

   private final byte[] branchQualifier;

   private final int formatId;

   private final byte[] globalTransactionId;

   private int hash;

   private boolean hashCalculated;

   // Static --------------------------------------------------------

   public static String toBase64String(final Xid xid)
   {
      byte[] data = XidImpl.toByteArray(xid);
      return Base64.encodeBytes(data, 0, data.length, Base64.DONT_BREAK_LINES | Base64.URL_SAFE);
   }

   private static byte[] toByteArray(final Xid xid)
   {
      byte[] branchQualifier = xid.getBranchQualifier();
      byte[] globalTransactionId = xid.getGlobalTransactionId();
      int formatId = xid.getFormatId();

      byte[] hashBytes = new byte[branchQualifier.length + globalTransactionId.length + 4];
      System.arraycopy(branchQualifier, 0, hashBytes, 0, branchQualifier.length);
      System.arraycopy(globalTransactionId, 0, hashBytes, branchQualifier.length, globalTransactionId.length);
      byte[] intBytes = new byte[4];
      for (int i = 0; i < 4; i++)
      {
         intBytes[i] = (byte)((formatId >> i * 8) % 0xFF);
      }
      System.arraycopy(intBytes, 0, hashBytes, branchQualifier.length + globalTransactionId.length, 4);
      return hashBytes;
   }

   // Constructors --------------------------------------------------

   /**
    * Standard constructor
    * @param branchQualifier
    * @param formatId
    * @param globalTransactionId
    */
   public XidImpl(final byte[] branchQualifier, final int formatId, final byte[] globalTransactionId)
   {
      this.branchQualifier = branchQualifier;
      this.formatId = formatId;
      this.globalTransactionId = globalTransactionId;
   }

   /**
    * Copy constructor
    * @param other
    */
   public XidImpl(final Xid other)
   {
      branchQualifier = copyBytes(other.getBranchQualifier());
      formatId = other.getFormatId();
      globalTransactionId = copyBytes(other.getGlobalTransactionId());
   }

   // Xid implementation ------------------------------------------------------------------

   public byte[] getBranchQualifier()
   {
      return branchQualifier;
   }

   public int getFormatId()
   {
      return formatId;
   }

   public byte[] getGlobalTransactionId()
   {
      return globalTransactionId;
   }

   // Public -------------------------------------------------------------------------------

   @Override
   public int hashCode()
   {
      if (!hashCalculated)
      {
         calcHash();
      }
      return hash;
   }

   @Override
   public boolean equals(final Object other)
   {
      if (this == other)
      {
         return true;
      }
      if (!(other instanceof Xid))
      {
         return false;
      }
      Xid xother = (Xid)other;
      if (xother.getFormatId() != formatId)
      {
         return false;
      }
      if (xother.getBranchQualifier().length != branchQualifier.length)
      {
         return false;
      }
      if (xother.getGlobalTransactionId().length != globalTransactionId.length)
      {
         return false;
      }
      for (int i = 0; i < branchQualifier.length; i++)
      {
         byte[] otherBQ = xother.getBranchQualifier();
         if (branchQualifier[i] != otherBQ[i])
         {
            return false;
         }
      }
      for (int i = 0; i < globalTransactionId.length; i++)
      {
         byte[] otherGtx = xother.getGlobalTransactionId();
         if (globalTransactionId[i] != otherGtx[i])
         {
            return false;
         }
      }
      return true;
   }

   @Override
   public String toString()
   {
      return "XidImpl (" + System.identityHashCode(this) +
             " bq:" +
             stringRep(branchQualifier) +
             " formatID:" +
             formatId +
             " gtxid:" +
             stringRep(globalTransactionId) +
             " base64:" + toBase64String(this);
   }

   // Private -------------------------------------------------------------------------------

   private String stringRep(final byte[] bytes)
   {
      StringBuffer buff = new StringBuffer();
      for (int i = 0; i < bytes.length; i++)
      {
         byte b = bytes[i];

         buff.append(b);

         if (i != bytes.length - 1)
         {
            buff.append('.');
         }
      }

      return buff.toString();
   }

   private void calcHash()
   {
      byte[] hashBytes = XidImpl.toByteArray(this);
      hash = Arrays.hashCode(hashBytes);
      hashCalculated = true;
   }

   private byte[] copyBytes(final byte[] other)
   {
      byte[] bytes = new byte[other.length];

      System.arraycopy(other, 0, bytes, 0, other.length);

      return bytes;
   }
}