/**
 * 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 storm.trident.operation;

import java.util.HashMap;
import java.util.Map;

import com.alibaba.jstorm.utils.JStormUtils;

import backtype.storm.Config;
import backtype.storm.topology.ResourceDeclarer;
import backtype.storm.utils.Utils;

/**
 * @param T Must always be the type of the extending class. i.e.
 * public class SubResourceDeclarer extends DefaultResourceDeclarer<SubResourceDeclarer> {...}
 */
public class DefaultResourceDeclarer<T extends DefaultResourceDeclarer> implements ResourceDeclarer<T>, ITridentResource {

    private Map<String, Number> resources = new HashMap<>();
    private Map conf = Utils.readStormConfig();

    @Override
    public T setMemoryLoad(Number onHeap) {
        return setMemoryLoad(onHeap, JStormUtils.parseDouble(conf.get(Config.TOPOLOGY_COMPONENT_RESOURCES_OFFHEAP_MEMORY_MB)));
    }

    @Override
    public T setMemoryLoad(Number onHeap, Number offHeap) {
        if (onHeap != null) {
            onHeap = onHeap.doubleValue();
            resources.put(Config.TOPOLOGY_COMPONENT_RESOURCES_ONHEAP_MEMORY_MB, onHeap);
        }
        if (offHeap!=null) {
            offHeap = offHeap.doubleValue();
            resources.put(Config.TOPOLOGY_COMPONENT_RESOURCES_OFFHEAP_MEMORY_MB, offHeap);
        }
        return (T)this;
    }

    @Override
    public T setCPULoad(Number amount) {
        if(amount != null) {
            amount = amount.doubleValue();
            resources.put(Config.TOPOLOGY_COMPONENT_CPU_PCORE_PERCENT, amount);
        }
        return (T)this;
    }

    @Override
    public Map<String, Number> getResources() {
        return new HashMap<String, Number>(resources);
    }
}