heron/packing/src/java/org/apache/heron/packing/constraints/MinRamConstraint.java

/**
 * 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.heron.packing.constraints;

import org.apache.heron.common.basics.ByteAmount;
import org.apache.heron.packing.exceptions.MinResourceNotSatisfiedException;
import org.apache.heron.spi.packing.PackingPlan;

public class MinRamConstraint implements InstanceConstraint {
  private static final ByteAmount MIN_RAM_PER_INSTANCE = ByteAmount.fromMegabytes(192);

  @Override
  public void test(PackingPlan.InstancePlan instancePlan) throws MinResourceNotSatisfiedException {
    if (instancePlan.getResource().getRam().lessThan(MIN_RAM_PER_INSTANCE)) {
      throw new MinResourceNotSatisfiedException(String.format("Instance %s is "
          + "configured %s RAM that is less than the minimum RAM per instance %s",
          instancePlan.getComponentName(), instancePlan.getResource().getRam().toString(),
          MIN_RAM_PER_INSTANCE.toString()));
    }
  }
}