com.nike.wingtips.util.asynchelperwrapper.FunctionWithTracing Maven / Gradle / Ivy
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package com.nike.wingtips.util.asynchelperwrapper;
import com.nike.internal.util.Pair;
import com.nike.wingtips.Span;
import com.nike.wingtips.Tracer;
import com.nike.wingtips.util.TracingState;
import org.slf4j.MDC;
import java.util.Deque;
import java.util.Map;
import java.util.function.Function;
import static com.nike.wingtips.util.AsyncWingtipsHelperStatic.linkTracingToCurrentThread;
import static com.nike.wingtips.util.AsyncWingtipsHelperStatic.unlinkTracingFromCurrentThread;
/**
* A {@link Function} that wraps the given original so that the given distributed tracing and MDC information is
* registered with the thread and therefore available during execution and unregistered after execution.
*/
@SuppressWarnings("WeakerAccess")
public class FunctionWithTracing implements Function {
protected final Function origFunction;
protected final Deque spanStackForExecution;
protected final Map mdcContextMapForExecution;
/**
* Constructor that extracts the current tracing and MDC information from the current thread using {@link
* Tracer#getCurrentSpanStackCopy()} and {@link MDC#getCopyOfContextMap()}, and forwards the information to
* the {@link FunctionWithTracing#FunctionWithTracing(Function, Deque, Map)}
* constructor. That tracing and MDC information will be associated with the thread when the given operation is
* executed.
*
* The operation you pass in cannot be null (an {@link IllegalArgumentException} will be thrown if you pass in
* null for the operation).
*/
public FunctionWithTracing(Function origFunction) {
this(origFunction, Tracer.getInstance().getCurrentSpanStackCopy(), MDC.getCopyOfContextMap());
}
/**
* Constructor that uses the given trace and MDC information, which will be associated with the thread when the
* given operation is executed.
*
* The operation you pass in cannot be null (an {@link IllegalArgumentException} will be thrown if you pass in
* null for the operation).
*
*
The {@link Pair} can be null, or you can pass null for the left and/or right side of the pair, and no error
* will be thrown. Any trace or MDC info that is null means the corresponding info will not be available to the
* thread when the operation is executed however.
*
*
You can pass in a {@link TracingState} for clearer less verbose code since it extends
* {@code Pair, Map>}.
*/
public FunctionWithTracing(Function origFunction,
Pair, Map> originalThreadInfo) {
this(
origFunction,
(originalThreadInfo == null) ? null : originalThreadInfo.getLeft(),
(originalThreadInfo == null) ? null : originalThreadInfo.getRight()
);
}
/**
* Constructor that uses the given trace and MDC information, which will be associated with the thread when the
* given operation is executed.
*
* The operation you pass in cannot be null (an {@link IllegalArgumentException} will be thrown if you pass in
* null for the operation).
*
*
The trace and/or MDC info can be null and no error will be thrown, however any trace or MDC info that is null
* means the corresponding info will not be available to the thread when the operation is executed.
*/
public FunctionWithTracing(Function origFunction,
Deque spanStackForExecution,
Map mdcContextMapForExecution) {
if (origFunction == null)
throw new IllegalArgumentException("origFunction cannot be null");
this.origFunction = origFunction;
this.spanStackForExecution = spanStackForExecution;
this.mdcContextMapForExecution = mdcContextMapForExecution;
}
/**
* Equivalent to calling {@code new FunctionWithTracing(origFunction)} - this allows you to do a static method
* import for cleaner looking code in some cases. This method ultimately extracts the current tracing and MDC
* information from the current thread using {@link Tracer#getCurrentSpanStackCopy()} and {@link
* MDC#getCopyOfContextMap()}. That tracing and MDC information will be associated with the thread when the given
* operation is executed.
*
* The operation you pass in cannot be null (an {@link IllegalArgumentException} will be thrown if you pass in
* null for the operation).
*
* @return {@code new FunctionWithTracing(origFunction)}.
* @see FunctionWithTracing#FunctionWithTracing(Function)
* @see FunctionWithTracing
*/
public static FunctionWithTracing withTracing(Function origFunction) {
return new FunctionWithTracing<>(origFunction);
}
/**
* Equivalent to calling {@code new FunctionWithTracing(origFunction, originalThreadInfo)} - this allows you
* to do a static method import for cleaner looking code in some cases. This method uses the given trace and MDC
* information, which will be associated with the thread when the given operation is executed.
*
* The operation you pass in cannot be null (an {@link IllegalArgumentException} will be thrown if you pass in
* null for the operation).
*
*
The {@link Pair} can be null, or you can pass null for the left and/or right side of the pair, and no error
* will be thrown. Any trace or MDC info that is null means the corresponding info will not be available to the
* thread when the operation is executed however.
*
*
You can pass in a {@link TracingState} for clearer less verbose code since it extends
* {@code Pair, Map>}.
*
* @return {@code new FunctionWithTracing(origFunction, originalThreadInfo)}.
* @see FunctionWithTracing#FunctionWithTracing(Function, Pair)
* @see FunctionWithTracing
*/
public static FunctionWithTracing withTracing(
Function origFunction,
Pair, Map> originalThreadInfo
) {
return new FunctionWithTracing<>(origFunction, originalThreadInfo);
}
/**
* Equivalent to calling {@code
* new FunctionWithTracing(origFunction, spanStackForExecution, mdcContextMapForExecution)} -
* this allows you to do a static method import for cleaner looking code in some cases. This method uses the given
* trace and MDC information, which will be associated with the thread when the given operation is executed.
*
* The operation you pass in cannot be null (an {@link IllegalArgumentException} will be thrown if you pass in
* null for the operation).
*
*
The trace and/or MDC info can be null and no error will be thrown, however any trace or MDC info that is null
* means the corresponding info will not be available to the thread when the operation is executed.
*
* @return {@code new FunctionWithTracing(origFunction, spanStackForExecution, mdcContextMapForExecution)}.
* @see FunctionWithTracing#FunctionWithTracing(Function, Deque, Map)
* @see FunctionWithTracing
*/
public static FunctionWithTracing withTracing(Function origFunction,
Deque spanStackForExecution,
Map mdcContextMapForExecution) {
return new FunctionWithTracing<>(origFunction, spanStackForExecution, mdcContextMapForExecution);
}
@Override
public U apply(T t) {
TracingState originalThreadInfo = null;
try {
originalThreadInfo =
linkTracingToCurrentThread(spanStackForExecution, mdcContextMapForExecution);
return origFunction.apply(t);
}
finally {
unlinkTracingFromCurrentThread(originalThreadInfo);
}
}
}