org.apache.beam.sdk.metrics.MetricName.java Source code

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Here is the source code for org.apache.beam.sdk.metrics.MetricName.java

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/*
 * 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.beam.sdk.metrics;

import static com.google.common.base.Preconditions.checkArgument;

import com.google.auto.value.AutoValue;
import com.google.common.base.Strings;
import java.io.Serializable;
import org.apache.beam.sdk.annotations.Experimental;
import org.apache.beam.sdk.annotations.Experimental.Kind;

/**
 * The name of a metric consists of a {@link #namespace} and a {@link #name}. The {@link #namespace}
 * allows grouping related metrics together and also prevents collisions between multiple metrics
 * with the same name.
 */
@Experimental(Kind.METRICS)
@AutoValue
public abstract class MetricName implements Serializable {

    /** The namespace associated with this metric. */
    public abstract String namespace();

    /** The name of this metric. */
    public abstract String name();

    public static MetricName named(String namespace, String name) {
        checkArgument(!Strings.isNullOrEmpty(namespace), "Metric namespace must be non-empty");
        checkArgument(!Strings.isNullOrEmpty(name), "Metric name must be non-empty");
        return new AutoValue_MetricName(namespace, name);
    }

    public static MetricName named(Class<?> namespace, String name) {
        checkArgument(namespace != null, "Metric namespace must be non-null");
        checkArgument(!Strings.isNullOrEmpty(name), "Metric name must be non-empty");
        return new AutoValue_MetricName(namespace.getName(), name);
    }
}