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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.kafka.common.telemetry.internals;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.Predicate;

public class ClientTelemetryEmitter implements MetricsEmitter {

    private final Predicate selector;
    private final List emitted;
    private final boolean deltaMetrics;

    ClientTelemetryEmitter(Predicate selector, boolean deltaMetrics) {
        this.selector = selector;
        this.emitted = new ArrayList<>();
        this.deltaMetrics = deltaMetrics;
    }

    @Override
    public boolean shouldEmitMetric(MetricKeyable metricKeyable) {
        return selector.test(metricKeyable);
    }

    @Override
    public boolean shouldEmitDeltaMetrics() {
        return deltaMetrics;
    }

    @Override
    public boolean emitMetric(SinglePointMetric metric) {
        if (!shouldEmitMetric(metric)) {
            return false;
        }

        emitted.add(metric);
        return true;
    }

    @Override
    public List emittedMetrics() {
        return Collections.unmodifiableList(emitted);
    }
}