LineageOS/android_packages_modules_Connectivity
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Merge "Frameworks/base: Make debug helper lazy in ConnectivityManager" into nyc-dev am: 2082480 am: 12aea50

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am: 9739a46

* commit '9739a467db314fc2ba0538a958d1f8c1e2693f95':
  Frameworks/base: Make debug helper lazy in ConnectivityManager

Change-Id: Iae09599af115044fd6e1c37c0f0222fe766281f0
This commit is contained in:
Andreas Gampe
2016-04-26 16:15:18 +00:00
committed by android-build-merger
parent 77247f65c3 9739a467db
commit ae941d00cc
1 changed files with 28 additions and 7 deletions
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35
core/java/android/net/ConnectivityManager.java
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@@ -81,13 +81,6 @@ import java.util.concurrent.atomic.AtomicInteger;
public class ConnectivityManager {
private static final String TAG = "ConnectivityManager";
private static final SparseArray<String> sMagicDecoderRing = MessageUtils.findMessageNames(
new Class[]{ConnectivityManager.class}, new String[]{"CALLBACK_"});
private static final String whatToString(int what) {
return sMagicDecoderRing.get(what, Integer.toString(what));
}
/**
* A change in network connectivity has occurred. A default connection has either
* been established or lost. The NetworkInfo for the affected network is
@@ -3363,4 +3356,32 @@ public class ConnectivityManager {
throw e.rethrowFromSystemServer();
}
}
/**
* A holder class for debug info (mapping CALLBACK values to field names). This is stored
* in a holder for two reasons:
* 1) The reflection necessary to establish the map can't be run at compile-time. Thus, this
* code will make the enclosing class not compile-time initializeable, deferring its
* initialization to zygote startup. This leads to dirty (but shared) memory.
* As this is debug info, use a holder that isn't initialized by default. This way the map
* will be created on demand, while ConnectivityManager can be compile-time initialized.
* 2) Static initialization is still preferred for its strong thread safety guarantees without
* requiring a lock.
*/
private static class NoPreloadHolder {
public static final SparseArray<String> sMagicDecoderRing = MessageUtils.findMessageNames(
new Class[]{ConnectivityManager.class}, new String[]{"CALLBACK_"});
}
static {
// When debug is enabled, aggressively initialize the holder by touching the field (which
// will guarantee static initialization).
if (CallbackHandler.DBG) {
Object dummy = NoPreloadHolder.sMagicDecoderRing;
}
}
private static final String whatToString(int what) {
return NoPreloadHolder.sMagicDecoderRing.get(what, Integer.toString(what));
}
}