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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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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.geode.internal.cache.locks;

import org.apache.geode.internal.DataSerializableFixedID;
import org.apache.geode.internal.Version;
import org.apache.geode.DataSerializer;
import java.io.*;

import org.apache.geode.distributed.internal.locks.LockGrantorId;
import org.apache.geode.distributed.internal.membership.*;

/**
 * Identifies a group of transaction locks.
 *
 */
public final class TXLockIdImpl implements TXLockId, DataSerializableFixedID {

  private static final long serialVersionUID = 8579214625084490134L;
  /** DistributionManager id for this member */
  private InternalDistributedMember memberId;

  /** Increments for each txLockId that is generated in this vm */
  private static int txCount = 0;

  /** Unique identifier within this member's vm */
  private int id;

  /** Identifies the lock grantor that granted the lock */
  private transient LockGrantorId grantedBy;

  /** Creates new instance of TXLockIdImpl */
  public TXLockIdImpl(InternalDistributedMember memberId) {
    this.memberId = memberId;
    synchronized (TXLockIdImpl.class) {
      this.id = txCount++;
    }
  }

  public final int getCount() {
    return this.id;
  }

  public final InternalDistributedMember getMemberId() {
    return this.memberId;
  }

  public void setLockGrantorId(LockGrantorId lockGrantorId) {
    this.grantedBy = lockGrantorId;
  }

  public LockGrantorId getLockGrantorId() {
    return this.grantedBy;
  }

  @Override
  public int hashCode() {
    int result = 17;
    final int mult = 37;

    result = mult * result + (this.memberId == null ? 0 : this.memberId.hashCode());
    result = mult * result + this.id;

    return result;
  }

  @Override
  public boolean equals(Object other) {
    if (other == this)
      return true;
    if (other == null)
      return false;
    if (!(other instanceof TXLockIdImpl))
      return false;
    final TXLockIdImpl that = (TXLockIdImpl) other;

    if (this.memberId != that.memberId
        && !(this.memberId != null && this.memberId.equals(that.memberId))) {
      return false;
    }
    if (this.id != that.id)
      return false;

    return true;
  }

  @Override
  public String toString() {
    return "TXLockId: " + this.memberId + "-" + this.id;
  }

  // -------------------------------------------------------------------------
  // DataSerializable support
  // -------------------------------------------------------------------------

  public TXLockIdImpl() {}

  public int getDSFID() {
    return TRANSACTION_LOCK_ID;
  }

  public void fromData(DataInput in) throws IOException, ClassNotFoundException {
    this.memberId = (InternalDistributedMember) DataSerializer.readObject(in);
    this.id = in.readInt();
  }

  public void toData(DataOutput out) throws IOException {
    DataSerializer.writeObject(this.memberId, out);
    out.writeInt(this.id);
  }

  public static final TXLockIdImpl createFromData(DataInput in)
      throws IOException, ClassNotFoundException {
    TXLockIdImpl result = new TXLockIdImpl();
    result.fromData(in);
    return result;
  }

  @Override
  public Version[] getSerializationVersions() {
    // TODO Auto-generated method stub
    return null;
  }
}