com.continuuity.loom.layout.ClusterLayout.java Source code

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Here is the source code for com.continuuity.loom.layout.ClusterLayout.java

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/*
 * Copyright 2012-2014, Continuuity, 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 com.continuuity.loom.layout;

import com.continuuity.loom.admin.ClusterTemplate;
import com.continuuity.loom.admin.Compatibilities;
import com.continuuity.loom.admin.Constraints;
import com.continuuity.loom.admin.Service;
import com.continuuity.loom.admin.ServiceConstraint;
import com.continuuity.loom.cluster.Node;
import com.google.common.base.Objects;
import com.google.common.collect.HashMultiset;
import com.google.common.collect.ImmutableMultiset;
import com.google.common.collect.Multiset;
import com.google.common.collect.Sets;

import java.util.Map;
import java.util.Set;

/**
 * Class describing the layout of a cluster, giving a mapping of {@link NodeLayout} to how many nodes use that layout.
 */
public class ClusterLayout {
    private final Constraints constraints;
    private final Multiset<NodeLayout> layout;
    private final Multiset<String> serviceCounts;

    public ClusterLayout(Constraints constraints, Multiset<NodeLayout> layout) {
        this.constraints = constraints;
        this.layout = ImmutableMultiset.copyOf(layout);
        this.serviceCounts = HashMultiset.create();
        for (Multiset.Entry<NodeLayout> entry : layout.entrySet()) {
            for (String service : entry.getElement().getServiceNames()) {
                serviceCounts.add(service, entry.getCount());
            }
        }
    }

    /**
     * Returns the cluster layout, which maps each node layout to how many nodes have that layout.
     *
     * @return Layout of the cluster.
     */
    public Multiset<NodeLayout> getLayout() {
        return layout;
    }

    public Constraints getConstraints() {
        return constraints;
    }

    /**
     * Returns whether or not the cluster layout is valid based on the constraints it has.
     *
     * @return True if the cluster layout is valid, false if not.
     */
    public boolean isValid() {
        return satisfiesConstraints(constraints);
    }

    public boolean isCompatibleWithTemplate(ClusterTemplate template) {
        // check all services are compatible
        Compatibilities compatibilities = template.getCompatibilities();
        if (!compatibilities.compatibleWithServices(serviceCounts.elementSet())) {
            return false;
        }
        // check all image types and hardware types are compatible
        Set<String> imageTypes = Sets.newHashSet();
        Set<String> hardwareTypes = Sets.newHashSet();
        for (NodeLayout nodeLayout : layout.elementSet()) {
            imageTypes.add(nodeLayout.getImageTypeName());
            hardwareTypes.add(nodeLayout.getHardwareTypeName());
        }
        // check all hardware types are compatible
        if (!compatibilities.compatibleWithImageTypes(imageTypes)
                || !compatibilities.compatibleWithHardwareTypes(hardwareTypes)) {
            return false;
        }

        return satisfiesConstraints(template.getConstraints());
    }

    /**
     * Derive a ClusterLayout from a set of {@link Node}s and some {@link Constraints}.
     *
     * @param clusterNodes Nodes to derive the layout from.
     * @param constraints Constraints for the cluster layout.
     * @return ClusterLayout derived from the nodes.
     */
    public static ClusterLayout fromNodes(Set<Node> clusterNodes, Constraints constraints) {
        Multiset<NodeLayout> nodeLayoutCounts = HashMultiset.create();
        for (Node node : clusterNodes) {
            Set<String> nodeServices = Sets.newHashSet();
            for (Service service : node.getServices()) {
                nodeServices.add(service.getName());
            }
            String hardwareType = node.getProperties().getHardwaretype();
            String imageType = node.getProperties().getImagetype();
            nodeLayoutCounts.add(new NodeLayout(hardwareType, imageType, nodeServices));
        }
        return new ClusterLayout(constraints, nodeLayoutCounts);
    }

    private boolean satisfiesConstraints(Constraints constraints) {
        // check node layouts
        Set<String> clusterServices = serviceCounts.elementSet();
        for (NodeLayout nodeLayout : layout.elementSet()) {
            if (!nodeLayout.satisfiesConstraints(constraints, clusterServices)) {
                return false;
            }
        }

        // check service counts
        Map<String, ServiceConstraint> serviceConstraints = constraints.getServiceConstraints();
        for (Multiset.Entry<String> entry : serviceCounts.entrySet()) {
            ServiceConstraint constraint = serviceConstraints.get(entry.getElement());
            if (constraint != null) {
                int serviceCount = entry.getCount();
                // TODO: ratio constraint
                if (serviceCount < constraint.getMinCount() || serviceCount > constraint.getMaxCount()
                        || serviceCount > layout.size()) {
                    return false;
                }
            }
        }
        return true;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof ClusterLayout)) {
            return false;
        }

        ClusterLayout that = (ClusterLayout) o;

        return Objects.equal(constraints, that.constraints) && Objects.equal(layout, that.layout)
                && Objects.equal(serviceCounts, that.serviceCounts);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(constraints, layout, serviceCounts);
    }
}