co.cask.cdap.common.zookeeper.coordination.ResourceAssignment.java Source code

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Here is the source code for co.cask.cdap.common.zookeeper.coordination.ResourceAssignment.java

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/*
 * Copyright  2014 Cask Data, Inc.
 *
 * Licensed 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 co.cask.cdap.common.zookeeper.coordination;

import com.google.common.base.Objects;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import com.google.common.collect.TreeMultimap;
import org.apache.twill.discovery.Discoverable;

/**
 * Describes the resource assignment as determined by {@link ResourceCoordinator}.
 */
public final class ResourceAssignment {

    private final String name;
    private final Multimap<Discoverable, PartitionReplica> assignments;

    /**
     * Creates without any assignment.
     *
     * @param name Name of the resource.
     */
    public ResourceAssignment(String name) {
        this(name, ImmutableMultimap.<Discoverable, PartitionReplica>of());
    }

    /**
     * Creates with the given assignment.
     *
     * @param name Name of the resource.
     * @param assignments Set of assignments carries by this object.
     */
    public ResourceAssignment(String name, Multimap<Discoverable, PartitionReplica> assignments) {
        this.name = name;

        TreeMultimap<Discoverable, PartitionReplica> multimap = TreeMultimap
                .create(DiscoverableComparator.COMPARATOR, PartitionReplica.COMPARATOR);
        multimap.putAll(assignments);
        this.assignments = Multimaps.unmodifiableSortedSetMultimap(multimap);
    }

    /**
     * Returns the name of the resource.
     */
    public String getName() {
        return name;
    }

    /**
     * Returns an immutable {@link Multimap} that contains all assignments.
     */
    public Multimap<Discoverable, PartitionReplica> getAssignments() {
        return assignments;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        ResourceAssignment other = (ResourceAssignment) o;
        return name.equals(other.name) && assignments.equals(other.assignments);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(name, assignments);
    }
}