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=str #16787 java cookbook #16850
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=str #16787 java cookbook #16850
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56 changes: 56 additions & 0 deletions
56
akka-samples/akka-docs-java-lambda/src/test/java/docs/stream/SilenceSystemOut.java
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,56 @@ | ||
package docs.stream; | ||
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import akka.actor.ActorRef; | ||
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import java.util.function.Predicate; | ||
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/** | ||
* Acts as if `System.out.println()` yet swallows all messages. | ||
* Useful for putting printlines in examples yet without poluting the build with them. | ||
*/ | ||
public class SilenceSystemOut { | ||
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private SilenceSystemOut() {} | ||
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public static System get() { | ||
return new System(new System.Println() { | ||
@Override | ||
public void println(String s) { | ||
// ignore | ||
} | ||
}); | ||
} | ||
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public static System get(ActorRef probe) { | ||
return new System(new System.Println() { | ||
@Override | ||
public void println(String s) { | ||
probe.tell(s, ActorRef.noSender()); | ||
} | ||
}); | ||
} | ||
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public static System get(Predicate<String> filter, ActorRef probe) { | ||
return new System(new System.Println() { | ||
@Override | ||
public void println(String s) { | ||
if (filter.test(s)) probe.tell(s, ActorRef.noSender()); | ||
} | ||
}); | ||
} | ||
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public static class System { | ||
public final Println out; | ||
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public System(Println out) { | ||
this.out = out; | ||
} | ||
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public static abstract class Println { | ||
public abstract void println(String s); | ||
public void println(Object s) { println(s.toString()); } | ||
} | ||
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} | ||
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} |
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this should not be changed here, but in release-2.3 branch
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ah, right - thanks!