package org.apache.helix.model.builder;
/*
* 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.
*/
import java.util.HashMap;
import java.util.Map;
import org.apache.helix.model.ClusterConstraints;
import org.apache.helix.model.ClusterConstraints.ConstraintType;
import org.apache.log4j.Logger;
public class ClusterConstraintsBuilder {
private static Logger LOG = Logger.getLogger(ClusterConstraintsBuilder.class);
final private ConstraintType _constraintType;
/**
* constraint-id -> constraint-item-builder
*
* e.g. constraint_1: at most 1 offline->slave state transition message for MyDB:
* constraint_1:
* MESSAGE_TYPE : StateTransition
* RESOURCE : MyDB
* TRANSITION : OFFLINE->SLAVE
* CONSTRAINT_VALUE : 1
*
*/
private final Map<String, ConstraintItemBuilder> _constraintBuilderMap = new HashMap<String, ConstraintItemBuilder>();
public ClusterConstraintsBuilder(ConstraintType type) {
if (type == null) {
throw new IllegalArgumentException("constraint-type should NOT be null");
}
_constraintType = type;
}
public ClusterConstraintsBuilder addConstraintAttribute(String constraintId, String attribute, String value) {
if (!_constraintBuilderMap.containsKey(constraintId)) {
_constraintBuilderMap.put(constraintId, new ConstraintItemBuilder());
}
ConstraintItemBuilder builder = _constraintBuilderMap.get(constraintId);
builder.addConstraintAttribute(attribute, value);
return this;
}
public ClusterConstraints build() {
ClusterConstraints constraints = new ClusterConstraints(_constraintType);
for (String constraintId : _constraintBuilderMap.keySet()) {
ConstraintItemBuilder builder = _constraintBuilderMap.get(constraintId);
constraints.addConstraintItem(constraintId, builder.build());
}
return constraints;
}
}