alluxio.wire.MetricValue.java Source code

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Here is the source code for alluxio.wire.MetricValue.java

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.wire;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;

import javax.annotation.concurrent.NotThreadSafe;

/**
 * Represents the value of a metrics property, only one of longValue or doubleValue should be set.
 */
@NotThreadSafe
public final class MetricValue {

    private Double mDoubleValue;
    private Long mLongValue;

    /**
     * Creates a new instance of {@link MetricValue} from a thrift representation.
     *
     * @param metricValue the thrift representation of a metric value
     */
    private MetricValue(alluxio.thrift.MetricValue metricValue) {
        Preconditions.checkState(metricValue.isSetDoubleValue() || metricValue.isSetLongValue(),
                "only one of longValue and doubleValue can be set");
        if (metricValue.isSetDoubleValue()) {
            mDoubleValue = metricValue.getDoubleValue();
        } else if (metricValue.isSetLongValue()) {
            mLongValue = metricValue.getLongValue();
        }
    }

    @JsonCreator
    private MetricValue(@JsonProperty("doubleValue") Double doubleValue,
            @JsonProperty("longValue") Long longValue) {
        Preconditions.checkState(doubleValue == null || longValue == null,
                "only one of longValue and doubleValue can be set");
        mDoubleValue = doubleValue;
        mLongValue = longValue;
    }

    /**
     * @param doubleValue the double value to set
     * @return a new metric value with double value
     */
    public static MetricValue forDouble(double doubleValue) {
        return new MetricValue(doubleValue, null);
    }

    /**
     * @param longValue the long value to set
     * @return a new metric value with long value
     */
    public static MetricValue forLong(long longValue) {
        return new MetricValue(null, longValue);
    }

    /**
     * @return the Double value
     */
    public Double getDoubleValue() {
        return mDoubleValue;
    }

    /**
     * @return the Long value
     */
    public Long getLongValue() {
        return mLongValue;
    }

    /**
     * @return thrift representation of the metric value
     */
    public alluxio.thrift.MetricValue toThrift() {
        if (mDoubleValue != null) {
            return new alluxio.thrift.MetricValue().setDoubleValue(mDoubleValue);
        } else {
            return new alluxio.thrift.MetricValue().setLongValue(mLongValue);
        }
    }

    /**
     * Converts a thrift type to a wire type.
     *
     * @param metricValue the thrift representation of a metric value
     * @return the wire type metric value
     */
    public static MetricValue fromThrift(alluxio.thrift.MetricValue metricValue) {
        return new MetricValue(metricValue);
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("doubleValue", mDoubleValue).add("longValue", mLongValue)
                .toString();
    }
}