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.kafka.trogdor.workload;
  
  import org.apache.kafka.common.utils.Time;
  
  import com.fasterxml.jackson.annotation.JsonCreator;
  import com.fasterxml.jackson.annotation.JsonProperty;
  
  /**
   * A transactions generator where we commit a transaction every N milliseconds
   */
  public class TimeIntervalTransactionsGenerator implements TransactionGenerator {
  
      private static final long NULL_START_MS = -1;
  
      private final Time time;
      private final int intervalMs;
  
      private long lastTransactionStartMs = NULL_START_MS;
  
      @JsonCreator
      public TimeIntervalTransactionsGenerator(@JsonProperty("transactionIntervalMs") int intervalMs) {
          this(intervalMs, Time.SYSTEM);
      }
  
      TimeIntervalTransactionsGenerator(@JsonProperty("transactionIntervalMs") int intervalMs,
                                        Time time) {
          if (intervalMs < 1) {
              throw new IllegalArgumentException("Cannot have a negative interval");
          }
          this.time = time;
          this.intervalMs = intervalMs;
      }
  
      @JsonProperty
      public int transactionIntervalMs() {
          return intervalMs;
      }
  
      @Override
      public synchronized TransactionAction nextAction() {
          if (lastTransactionStartMs == NULL_START_MS) {
              lastTransactionStartMs = time.milliseconds();
              return TransactionAction.BEGIN_TRANSACTION;
          }
          if (time.milliseconds() - lastTransactionStartMs >= intervalMs) {
              lastTransactionStartMs = NULL_START_MS;
              return TransactionAction.COMMIT_TRANSACTION;
          }
  
          return TransactionAction.NO_OP;
      }
  }
  