/**
* 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.tajo;
import org.apache.tajo.validation.Validator;
public interface ConfigKey {
// Client can set or change variables of this mode.
public static final int DEFAULT_MODE = 0;
// This is similar to DEFAULT mode. In addition, it tries to get values from shell env. variables.
public static final int FROM_SHELL_ENV_MODE = 1;
// only TajoMaster is able to set and change variables of this mode.
public static final int SERVER_SIDE_VAR_MODE = 2;
// This type variable will be used only in cli side.
public static final int CLI_SIDE_VAR_MODE = 3;
public static enum ConfigType {
SYSTEM(""),
SESSION("$"),
QUERY("@"),
CLI("+");
private String prefix;
ConfigType(String prefix) {
this.prefix = prefix;
}
public String getPrefix() {
return prefix;
}
}
public String keyname();
public ConfigType type();
public Class<?> valueClass();
public Validator validator();
}