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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.tracing;

import com.palantir.tracing.api.Span;
import com.palantir.tracing.api.SpanObserver;
import java.util.Collection;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

final class TestTracingSubscriber implements SpanObserver {

    // Spans can be emitted from different threads, so using a concurrent datastructure rather than an ArrayList.
    private final Queue allSpans = new ConcurrentLinkedQueue<>();

    @Override
    public void consume(Span span) {
        allSpans.add(span);
    }

    Collection getAllSpans() {
        return allSpans;
    }
}