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This package contains classes used to manage a DataConnection. A criticial aspect of this class is that most objects in this package run on the same thread except DataConnectionTracker This makes processing efficient as it minimizes context switching and it eliminates issues with multi-threading. This can be done because all actions are either asynchronous or are known to be non-blocking and fast. At this time only DcTesterDeactivateAll takes specific advantage of this single threading knowledge by using Dcc#mDcListAll so be very careful when making changes that break this assumption. A related change was in DataConnectionAc I added code that checks to see if the caller is on a different thread. If it is then the AsyncChannel#sendMessageSynchronously is used. If the caller is on the same thread then a getter is used. This allows the DCAC to be used from any thread and was required to fix a bug when Dcc called PhoneBase#notifyDataConnection which calls DCT#getLinkProperties and DCT#getLinkCapabilities which call Dcc all on the same thread. Without this change there was a dead lock when sendMessageSynchronously blocks. == Testing == The following are Intents that can be sent for testing pruproses on DEBUGGABLE builds (userdebug, eng) *) Causes bringUp and retry requests to fail for all DC's adb shell am broadcast -a com.android.internal.telephony.dataconnection.action_fail_bringup --ei counter 2 --ei fail_cause -3 *) Causes all DC's to get torn down, simulating a temporary network outage: adb shell am broadcast -a com.android.internal.telephony.dataconnection.action_deactivate_all *) To simplify testing we also have detach and attach simulations below where {x} is gsm, cdma or sip adb shell am broadcast -a com.android.internal.telephony.{x}.action_detached adb shell am broadcast -a com.android.internal.telephony.{x}.action_attached == System properties for Testing == On debuggable builds (userdebug, eng) you can change additional settings through system properties. These properties can be set with "setprop" for the current boot, or added to local.prop to persist across boots. device# setprop key value device# echo "key=value" >> /data/local.prop device# chmod 644 /data/local.prop -- Retry configuration -- You can replace the connection retry configuration. For example, you could change it to perform 4 retries at 5 second intervals: device# setprop test.data_retry_config "5000,5000,5000" -- Roaming -- You can force the telephony stack to always assume that it's roaming to verify higher-level framework functionality: device# setprop telephony.test.forceRoaming true
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