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/*
* Copyright 2018, OpenCensus Authors
*
* 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 io.opencensus.implcore.trace.export;
import io.opencensus.implcore.trace.SpanImpl;
import io.opencensus.trace.export.SampledSpanStore;
import io.opencensus.trace.export.SampledSpanStore.ErrorFilter;
import io.opencensus.trace.export.SampledSpanStore.LatencyFilter;
import io.opencensus.trace.export.SampledSpanStore.PerSpanNameSummary;
import io.opencensus.trace.export.SampledSpanStore.Summary;
import io.opencensus.trace.export.SpanData;
import java.util.Collection;
import java.util.Collections;
import java.util.Set;
/** Abstract implementation of the {@link SampledSpanStore}. */
public abstract class SampledSpanStoreImpl extends SampledSpanStore {
private static final SampledSpanStoreImpl NOOP_SAMPLED_SPAN_STORE_IMPL =
new NoopSampledSpanStoreImpl();
/** Returns the new no-op implmentation of {@link SampledSpanStoreImpl}. */
public static SampledSpanStoreImpl getNoopSampledSpanStoreImpl() {
return NOOP_SAMPLED_SPAN_STORE_IMPL;
}
/**
* Considers to save the given spans to the stored samples. This must be called at the end of each
* Span with the option RECORD_EVENTS.
*
* @param span the span to be consider for storing into the store buckets.
*/
public abstract void considerForSampling(SpanImpl span);
private static final class NoopSampledSpanStoreImpl extends SampledSpanStoreImpl {
private static final Summary EMPTY_SUMMARY =
Summary.create(Collections.<String, PerSpanNameSummary>emptyMap());
private static final Set<String> EMPTY_REGISTERED_SPAN_NAMES = Collections.<String>emptySet();
private static final Collection<SpanData> EMPTY_SPANDATA = Collections.<SpanData>emptySet();
@Override
public Summary getSummary() {
return EMPTY_SUMMARY;
}
@Override
public void considerForSampling(SpanImpl span) {}
@Override
public void registerSpanNamesForCollection(Collection<String> spanNames) {}
@Override
public void unregisterSpanNamesForCollection(Collection<String> spanNames) {}
@Override
public Set<String> getRegisteredSpanNamesForCollection() {
return EMPTY_REGISTERED_SPAN_NAMES;
}
@Override
public Collection<SpanData> getErrorSampledSpans(ErrorFilter filter) {
return EMPTY_SPANDATA;
}
@Override
public Collection<SpanData> getLatencySampledSpans(LatencyFilter filter) {
return EMPTY_SPANDATA;
}
}
}
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