geode-memcached/src/main/java/org/apache/geode/internal/memcached/Reply.java

/*
 * 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.memcached;

/**
 * Represents the reply messages sent to the client. All reply types override toString to send
 * "\r\n"
 */
public enum Reply {

  /**
   * to indicate success
   */
  STORED {
    @Override
    public String toString() {
      return "STORED\r\n";
    }
  },

  /**
   * to indicate the data was not stored, but not because of an error. This normally means that the
   * condition for an "add" or a "replace" command wasn't met.
   */
  NOT_STORED {
    @Override
    public String toString() {
      return "NOT_STORED\r\n";
    }
  },

  /**
   * to indicate that the item you are trying to store with a "cas" command has been modified since
   * you last fetched it.
   */
  EXISTS {
    @Override
    public String toString() {
      return "EXISTS\r\n";
    }
  },

  /**
   * to indicate that the item you are trying to store with a "cas" command did not exist. Also used
   * by delete.
   */
  NOT_FOUND {
    @Override
    public String toString() {
      return "NOT_FOUND\r\n";
    }
  },

  /**
   * to indicate that get/gets operation has completed
   */
  END {
    @Override
    public String toString() {
      return "END\r\n";
    }
  },

  /**
   * to indicate that flush_all has completed
   */
  OK {
    @Override
    public String toString() {
      return "OK\r\n";
    }
  },

  /**
   * to indicate success on delete
   */
  DELETED {
    @Override
    public String toString() {
      return "DELETED\r\n";
    }
  },

  /**
   * means the client sent a nonexistent command name
   */
  ERROR {
    @Override
    public String toString() {
      return "ERROR\r\n";
    }
  },

  /**
   * means some sort of client error in the input line
   */
  CLIENT_ERROR {
    @Override
    public String toString() {
      return "CLIENT_ERROR client error in the input line\r\n";
    }
  }
}