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To potentially optimize the collection code path (#3047) ResourceMetrics sent to the Exporter may be reused in the future. Warn users of this. Co-authored-by: Chester Cheung <cheung.zhy.csu@gmail.com>
70 lines
2.7 KiB
Go
70 lines
2.7 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package metric // import "go.opentelemetry.io/otel/sdk/metric"
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import (
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"context"
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"fmt"
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"go.opentelemetry.io/otel/sdk/metric/aggregation"
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"go.opentelemetry.io/otel/sdk/metric/metricdata"
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)
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// ErrExporterShutdown is returned if Export or Shutdown are called after an
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// Exporter has been Shutdown.
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var ErrExporterShutdown = fmt.Errorf("exporter is shutdown")
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// Exporter handles the delivery of metric data to external receivers. This is
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// the final component in the metric push pipeline.
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type Exporter interface {
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// Temporality returns the Temporality to use for an instrument kind.
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Temporality(InstrumentKind) metricdata.Temporality
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// Aggregation returns the Aggregation to use for an instrument kind.
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Aggregation(InstrumentKind) aggregation.Aggregation
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// Export serializes and transmits metric data to a receiver.
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//
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// This is called synchronously, there is no concurrency safety
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// requirement. Because of this, it is critical that all timeouts and
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// cancellations of the passed context be honored.
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//
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// All retry logic must be contained in this function. The SDK does not
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// implement any retry logic. All errors returned by this function are
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// considered unrecoverable and will be reported to a configured error
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// Handler.
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//
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// The passed ResourceMetrics may be reused when the call completes. If an
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// exporter needs to hold this data after it returns, it needs to make a
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// copy.
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Export(context.Context, metricdata.ResourceMetrics) error
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// ForceFlush flushes any metric data held by an exporter.
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//
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// The deadline or cancellation of the passed context must be honored. An
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// appropriate error should be returned in these situations.
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ForceFlush(context.Context) error
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// Shutdown flushes all metric data held by an exporter and releases any
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// held computational resources.
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//
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// The deadline or cancellation of the passed context must be honored. An
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// appropriate error should be returned in these situations.
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//
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// After Shutdown is called, calls to Export will perform no operation and
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// instead will return an error indicating the shutdown state.
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Shutdown(context.Context) error
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}
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