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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.hadoop.hbase.quotas;

import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.protobuf.generated.QuotaProtos.Quotas;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;

/**
 * In-Memory state of table or namespace quotas
 */
@InterfaceAudience.Private
@InterfaceStability.Evolving
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="IS2_INCONSISTENT_SYNC",
  justification="FindBugs seems confused; says globalLimiter and lastUpdate " +
  "are mostly synchronized...but to me it looks like they are totally synchronized")
public class QuotaState {
  private long lastUpdate = 0;
  private long lastQuery = 0;
  private QuotaLimiter globalLimiter = NoopQuotaLimiter.get();

  public QuotaState() {
    this(0);
  }

  public QuotaState(final long updateTs) {
    lastUpdate = updateTs;
  }

  public synchronized long getLastUpdate() {
    return lastUpdate;
  }

  public synchronized long getLastQuery() {
    return lastQuery;
  }

  @Override
  public synchronized String toString() {
    StringBuilder builder = new StringBuilder();
    builder.append("QuotaState(ts=" + getLastUpdate());
    if (isBypass()) {
      builder.append(" bypass");
    } else {
      if (globalLimiter != NoopQuotaLimiter.get()) {
        // builder.append(" global-limiter");
        builder.append(" " + globalLimiter);
      }
    }
    builder.append(')');
    return builder.toString();
  }

  /**
   * @return true if there is no quota information associated to this object
   */
  public synchronized boolean isBypass() {
    return globalLimiter == NoopQuotaLimiter.get();
  }

  /**
   * Setup the global quota information. (This operation is part of the QuotaState setup)
   */
  public synchronized void setQuotas(final Quotas quotas) {
    if (quotas.hasThrottle()) {
      globalLimiter = QuotaLimiterFactory.fromThrottle(quotas.getThrottle());
    } else {
      globalLimiter = NoopQuotaLimiter.get();
    }
  }

  /**
   * Perform an update of the quota info based on the other quota info object. (This operation is
   * executed by the QuotaCache)
   */
  public synchronized void update(final QuotaState other) {
    if (globalLimiter == NoopQuotaLimiter.get()) {
      globalLimiter = other.globalLimiter;
    } else if (other.globalLimiter == NoopQuotaLimiter.get()) {
      globalLimiter = NoopQuotaLimiter.get();
    } else {
      globalLimiter = QuotaLimiterFactory.update(globalLimiter, other.globalLimiter);
    }
    lastUpdate = other.lastUpdate;
  }

  /**
   * Return the limiter associated with this quota.
   * @return the quota limiter
   */
  public synchronized QuotaLimiter getGlobalLimiter() {
    setLastQuery(EnvironmentEdgeManager.currentTime());
    return globalLimiter;
  }

  /**
   * Return the limiter associated with this quota without updating internal last query stats
   * @return the quota limiter
   */
  synchronized QuotaLimiter getGlobalLimiterWithoutUpdatingLastQuery() {
    return globalLimiter;
  }

  public synchronized void setLastQuery(long lastQuery) {
    this.lastQuery = lastQuery;
  }
}