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/*
 * (c) Copyright 2019 Palantir Technologies Inc. All rights reserved.
 *
 * 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.palantir.atlasdb.util;

import com.codahale.metrics.MetricRegistry;
import com.github.benmanes.caffeine.cache.CacheLoader;
import com.github.benmanes.caffeine.cache.Caffeine;
import com.github.benmanes.caffeine.cache.LoadingCache;
import com.palantir.tritium.metrics.registry.MetricName;
import java.util.Map;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.immutables.value.Value;

/** Cache to avoid excessive string concatenation in MetricRegistry.name(clazz, metricName). */
final class MetricNameCache {

    private final LoadingCache cache;

    MetricNameCache() {
        this.cache = Caffeine.newBuilder().build(new CacheLoader<>() {
            @Nullable
            @Override
            public MetricName load(@Nonnull Key key) {
                return MetricName.builder()
                        .safeName(MetricRegistry.name(key.getClazz(), key.getMetricName()))
                        .safeTags(key.getTags())
                        .build();
            }
        });
    }

    MetricName get(Class clazz, String metricName, Map tags) {
        return cache.get(ImmutableKey.of(clazz, metricName, tags));
    }

    void invalidate() {
        cache.invalidateAll();
    }

    @Value.Immutable(lazyhash = true)
    interface Key {

        @Value.Parameter
        Class getClazz();

        @Value.Parameter
        String getMetricName();

        @Value.Parameter
        Map getTags();
    }
}