StateMachine: add getLogRecMaxSize()

Add the getLogRecMaxSize() method, so that
WifiStateMachine tests can verify the log
record buffer size, without having to fill
the buffer.

Bug: 35399013
Test: compile
Change-Id: Ib1bd8d670b7b39e9f740a4dd92ea67463b179ce2

core/java/com/android/internal/util/StateMachine.java

@@ -23,6 +23,8 @@ import android.os.Message;
 import android.text.TextUtils;
 import android.util.Log;
 
+import com.android.internal.annotations.VisibleForTesting;
+
 import java.io.FileDescriptor;
 import java.io.PrintWriter;
 import java.io.StringWriter;
@@ -1495,7 +1497,7 @@ public class StateMachine {
     }
 
     /**
-     * @return number of log records
+     * @return the number of log records currently readable
      */
     public final int getLogRecSize() {
         // mSmHandler can be null if the state machine has quit.
@@ -1504,6 +1506,17 @@ public class StateMachine {
         return smh.mLogRecords.size();
     }
 
+    /**
+     * @return the number of log records we can store
+     */
+    @VisibleForTesting
+    public final int getLogRecMaxSize() {
+        // mSmHandler can be null if the state machine has quit.
+        SmHandler smh = mSmHandler;
+        if (smh == null) return 0;
+        return smh.mLogRecords.mMaxSize;
+    }
+
     /**
      * @return the total number of records processed
      */