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From neykov <...@git.apache.org>
Subject [GitHub] brooklyn-server pull request #259: Create OptionalEntity to allow configurab...
Date Thu, 14 Jul 2016 14:22:07 GMT
Github user neykov commented on a diff in the pull request:

    https://github.com/apache/brooklyn-server/pull/259#discussion_r70813772
  
    --- Diff: core/src/main/java/org/apache/brooklyn/entity/stock/OptionalEntity.java ---
    @@ -0,0 +1,56 @@
    +/*
    + * 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 com.google.common.annotations.Beta;
    +import com.google.common.reflect.TypeToken;
    +
    +import org.apache.brooklyn.api.entity.EntitySpec;
    +import org.apache.brooklyn.api.entity.ImplementedBy;
    +import org.apache.brooklyn.config.ConfigKey;
    +import org.apache.brooklyn.core.config.ConfigKeys;
    +import org.apache.brooklyn.core.sensor.AttributeSensorAndConfigKey;
    +import org.apache.brooklyn.util.core.flags.SetFromFlag;
    +
    +/**
    + * An entity that creates an optional child, based on a configuration key value.
    + * <p>
    + * <pre>
    + * - type: org.apache.brooklyn.entity.stock.OptionalEntity
    + *   brooklyn.config:
    + *     optional.entity.create: $brooklyn:scopeRoot().config("enable.loadBalancer")
    + *     optional.entity.spec:
    + *       $brooklyn:entitySpec:
    + *         type: load-balancer
    + *         brooklyn.config:
    + *           proxy.port: 8080
    + *           loadbalancer.serverpool: $brooklyn:entity("servers")
    + * </pre>
    + */
    +@Beta
    +@ImplementedBy(OptionalEntityImpl.class)
    +public interface OptionalEntity extends BasicStartable {
    --- End diff --
    
    Would a `ConditionalEntity` be a better name?


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