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/*
* Copyright 2016-17, 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.trace;
import io.opencensus.common.Clock;
import io.opencensus.internal.ZeroTimeClock;
import io.opencensus.trace.config.TraceConfig;
import io.opencensus.trace.export.ExportComponent;
import io.opencensus.trace.propagation.PropagationComponent;
/**
* Class that holds the implementation instances for {@link Tracer}, {@link PropagationComponent},
* {@link Clock}, {@link ExportComponent} and {@link TraceConfig}.
*
* <p>Unless otherwise noted all methods (on component) results are cacheable.
*
* @since 0.5
*/
public abstract class TraceComponent {
/**
* Returns the {@link Tracer} with the provided implementations. If no implementation is provided
* then no-op implementations will be used.
*
* @return the {@code Tracer} implementation.
* @since 0.5
*/
public abstract Tracer getTracer();
/**
* Returns the {@link PropagationComponent} with the provided implementation. If no implementation
* is provided then no-op implementation will be used.
*
* @return the {@code PropagationComponent} implementation.
* @since 0.5
*/
public abstract PropagationComponent getPropagationComponent();
/**
* Returns the {@link Clock} with the provided implementation.
*
* @return the {@code Clock} implementation.
* @since 0.5
*/
public abstract Clock getClock();
/**
* Returns the {@link ExportComponent} with the provided implementation. If no implementation is
* provided then no-op implementations will be used.
*
* @return the {@link ExportComponent} implementation.
* @since 0.5
*/
public abstract ExportComponent getExportComponent();
/**
* Returns the {@link TraceConfig} with the provided implementation. If no implementation is
* provided then no-op implementations will be used.
*
* @return the {@link TraceConfig} implementation.
* @since 0.5
*/
public abstract TraceConfig getTraceConfig();
/**
* Returns an instance that contains no-op implementations for all the instances.
*
* @return an instance that contains no-op implementations for all the instances.
*/
static TraceComponent newNoopTraceComponent() {
return new NoopTraceComponent();
}
private static final class NoopTraceComponent extends TraceComponent {
private final ExportComponent noopExportComponent = ExportComponent.newNoopExportComponent();
@Override
public Tracer getTracer() {
return Tracer.getNoopTracer();
}
@Override
public PropagationComponent getPropagationComponent() {
return PropagationComponent.getNoopPropagationComponent();
}
@Override
public Clock getClock() {
return ZeroTimeClock.getInstance();
}
@Override
public ExportComponent getExportComponent() {
return noopExportComponent;
}
@Override
public TraceConfig getTraceConfig() {
return TraceConfig.getNoopTraceConfig();
}
private NoopTraceComponent() {}
}
}
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