question: public static void enterMethod ( int globalMethodId ) { final Thread ct = Thread . currentThread ( ) ; if ( ct == Agent . server || Thread . holdsLock ( rl ) || Thread . holdsLock ( globalLock ) || ct . getThreadGroup ( ) == systemThreadGroup || ct == Transformer . transformerThread ) { return ; } if ( ! enabled ) { return ; } synchronized ( globalLock ) { int sessionIdOfMethod = globalMethodId > > 16 ; if ( sessionIdOfMethod != sessionId ) { return ; } int mid = globalMethodId & 0xffff ; ThreadProfiler ti = null ; synchronized ( rl ) { ti = globalThreadInfos . get ( ct ) ; if ( ti == null ) { ti = new ThreadProfiler ( ) ; globalThreadInfos . put ( ct , ti ) ; } } ti . enter0 ( globalMethods [ mid ] ) ; } }
target:  Records a method's entry. This method is called by instrumented code.