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.common.transactions;
  
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.io.IJsonSerializable;
  import org.apache.hyracks.api.io.IPersistedResourceRegistry;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.node.ObjectNode;
  
  public class Checkpoint implements Comparable<Checkpoint>, IJsonSerializable {
  
      private static final long serialVersionUID = 1L;
      private final long checkpointLsn;
      private final long minMCTFirstLsn;
      private final long maxTxnId;
      private final boolean sharp;
      private final int storageVersion;
      private long id;
  
      public Checkpoint(long id, long checkpointLsn, long minMCTFirstLsn, long maxTxnId, boolean sharp,
              int storageVersion) {
          this.id = id;
          this.checkpointLsn = checkpointLsn;
          this.minMCTFirstLsn = minMCTFirstLsn;
          this.maxTxnId = maxTxnId;
          this.sharp = sharp;
          this.storageVersion = storageVersion;
      }
  
      public long getCheckpointLsn() {
          return checkpointLsn;
      }
  
      public long getMinMCTFirstLsn() {
          return minMCTFirstLsn;
      }
  
      public long getMaxTxnId() {
          return maxTxnId;
      }
  
      public long getId() {
          return id;
      }
  
      public boolean isSharp() {
          return sharp;
      }
  
      public int getStorageVersion() {
          return storageVersion;
      }
  
      @Override
      public int compareTo(Checkpoint other) {
          return Long.compare(this.id, other.id);
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
          Checkpoint that = (Checkpoint) o;
          return id == that.id;
      }
  
      @Override
      public int hashCode() {
          return Long.hashCode(id);
      }
  
      @Override
      public JsonNode toJson(IPersistedResourceRegistry registry) throws HyracksDataException {
          final ObjectNode checkpointJson = registry.getClassIdentifier(getClass(), serialVersionUID);
          checkpointJson.put("id", id);
          checkpointJson.put("checkpointLsn", checkpointLsn);
          checkpointJson.put("minMCTFirstLsn", minMCTFirstLsn);
          checkpointJson.put("maxTxnId", maxTxnId);
          checkpointJson.put("sharp", sharp);
          checkpointJson.put("storageVersion", storageVersion);
          return checkpointJson;
      }
  
      @SuppressWarnings("squid:S1172") // unused parameter
      public static IJsonSerializable fromJson(IPersistedResourceRegistry registry, JsonNode json) {
          long id = json.get("id").asLong();
          long checkpointLsn = json.get("checkpointLsn").asLong();
          long minMCTFirstLsn = json.get("minMCTFirstLsn").asLong();
          long maxTxnId = json.get("maxTxnId").asLong();
          boolean sharp = json.get("sharp").asBoolean();
          int storageVersion = json.get("storageVersion").asInt();
          return new Checkpoint(id, checkpointLsn, minMCTFirstLsn, maxTxnId, sharp, storageVersion);
      }
  }
  