org.apache.aurora.scheduler.base.InstanceKeys.java Source code

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Here is the source code for org.apache.aurora.scheduler.base.InstanceKeys.java

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/**
 * 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 org.apache.aurora.scheduler.base;

import java.util.Objects;

import com.google.common.base.Preconditions;

import org.apache.aurora.gen.InstanceKey;
import org.apache.aurora.scheduler.storage.entities.IInstanceKey;
import org.apache.aurora.scheduler.storage.entities.IJobKey;

/**
 * Utility function for {@link IInstanceKey instance keys}.
 */
public final class InstanceKeys {
    private InstanceKeys() {
        // Utility class.
    }

    /**
     * Creates an instance key from a job and instance ID.
     *
     * @param job Job key.
     * @param instanceId Instance id.
     * @return Instance ID.
     */
    public static IInstanceKey from(IJobKey job, int instanceId) {
        Objects.requireNonNull(job);
        Preconditions.checkArgument(instanceId >= 0);
        return IInstanceKey.build(new InstanceKey(job.newBuilder(), instanceId));
    }

    /**
     * Creates a human-friendly string for an instance key.
     *
     * @param instance Instance key.
     * @return String representation of the instance key.
     */
    public static String toString(IInstanceKey instance) {
        return JobKeys.canonicalString(instance.getJobKey()) + "/" + instance.getInstanceId();
    }
}