/*
 * 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.brooklyn.entity.stock;

import java.util.Map;

import org.apache.brooklyn.api.entity.Entity;
import org.apache.brooklyn.api.entity.ImplementedBy;
import org.apache.brooklyn.api.sensor.AttributeSensor;
import org.apache.brooklyn.config.ConfigKey;
import org.apache.brooklyn.core.config.ConfigKeys;
import org.apache.brooklyn.core.entity.trait.Startable;
import org.apache.brooklyn.util.core.flags.SetFromFlag;

import com.google.common.base.Supplier;
import com.google.common.reflect.TypeToken;

/**
 * An entity that supplies data as {@link AttributeSensor} values.
 * <p>
 * Usage:
 * <pre>{@code
 * EntitySpec.create(DataEntity.class)
 *          .configure(SENSOR_DATA_MAP, MutableMap.builder()
 *                  .put(Sensors.newStringSensor("string.data"), new Supplier<String>() { ... })
 *                  .put(Sensors.newLongSensor("long.data"), new Supplier<Long>() { ... })
 *                  .build());
 * }</pre>
 */
@ImplementedBy(DataEntityImpl.class)
public interface DataEntity extends Entity, Startable {

    @SetFromFlag("pollPeriod")
    ConfigKey<Long> POLL_PERIOD = ConfigKeys.newLongConfigKey(
            "data.sensorpoll", "Poll period (in milliseconds)", 1000L);

    @SetFromFlag("sensorSuppliers")
    ConfigKey<Map<AttributeSensor<?>, Supplier<?>>> SENSOR_SUPPLIER_MAP = ConfigKeys.newConfigKey(
            new TypeToken<Map<AttributeSensor<?>, Supplier<?>>>() { },
            "data.sensorSupplierMap", "Map linking sensors and data suppliers");

}