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Server functionality for HBase

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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.quotas.OperationQuota.OperationType;

/**
 * Noop quota limiter returned when no limiter is associated to the user/table
 */
@InterfaceAudience.Private
@InterfaceStability.Evolving
final class NoopQuotaLimiter implements QuotaLimiter {
  private static QuotaLimiter instance = new NoopQuotaLimiter();

  private NoopQuotaLimiter() {
    // no-op
  }

  @Override
  public void checkQuota(long estimateWriteSize, long estimateReadSize) throws ThrottlingException {
    // no-op
  }

  @Override
  public void grabQuota(long writeSize, long readSize) {
    // no-op
  }

  @Override
  public void consumeWrite(final long size) {
    // no-op
  }

  @Override
  public void consumeRead(final long size) {
    // no-op
  }

  @Override
  public boolean isBypass() {
    return true;
  }

  @Override
  public long getWriteAvailable() {
    throw new UnsupportedOperationException();
  }

  @Override
  public long getReadAvailable() {
    throw new UnsupportedOperationException();
  }

  @Override
  public void addOperationSize(OperationType type, long size) {
  }

  @Override
  public long getAvgOperationSize(OperationType type) {
    return -1;
  }

  @Override
  public String toString() {
    return "NoopQuotaLimiter";
  }

  public static QuotaLimiter get() {
    return instance;
  }
}