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Add methods to add new context on Message #490

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29 changes: 29 additions & 0 deletions analytics/src/main/java/com/segment/analytics/Analytics.java
Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,9 @@
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
Expand Down Expand Up @@ -45,6 +47,7 @@ public class Analytics {
private final List<MessageTransformer> messageTransformers;
private final List<MessageInterceptor> messageInterceptors;
private final Log log;
private Map<String, Object> externalContext;

Analytics(
AnalyticsClient client,
Expand All @@ -55,6 +58,7 @@ public class Analytics {
this.messageTransformers = messageTransformers;
this.messageInterceptors = messageInterceptors;
this.log = log;
this.externalContext = null;
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context needs to be added in a MessageTransformer as it needs to be added when the message is being built. If we are in a server side app dropping segment tracking events, it would need to have picked up the context for that individual request which is traditionally ThreadLocalContext. Its not on the Analytics object itself.

}

/**
Expand Down Expand Up @@ -114,7 +118,11 @@ private Message buildMessage(MessageBuilder builder) {
return null;
}
}

Map<String, Object> newContext = this.existExternalContext(builder.build());
builder.context(newContext);
Message message = builder.build();

for (MessageInterceptor messageInterceptor : messageInterceptors) {
message = messageInterceptor.intercept(message);
if (message == null) {
Expand All @@ -125,6 +133,27 @@ private Message buildMessage(MessageBuilder builder) {
return message;
}

private void addExternalContext(String contextKey, Object contextValue) {
this.externalContext = new HashMap<>();
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this is a private method - and I can't see aanything calling it? Also it replaces the external context every time so it would only ever have 1 key?

this.externalContext.put(contextKey, contextValue);
}

private Map<String, Object> existExternalContext(Message message) {

// Retrieve the existing context if it exists
Map<String, ?> existingContext = message.context();
if (existingContext == null) {
existingContext = new HashMap<>();
}

// Augment the existing context with new context
Map<String, Object> newContext = new HashMap<>(existingContext);
if (this.externalContext != null) {
newContext.putAll(this.externalContext);
}
return newContext;
}

/** Fluent API for creating {@link Analytics} instances. */
public static class Builder {
private static final String DEFAULT_ENDPOINT = "https://api.segment.io";
Expand Down
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