Java: An example of simplifying code with lambda expressions

Before, call the 3rd party service, each method is almost "long" this way, write up verbose, change trouble, but also easy to change leaks.

public void Authorizeroletouser (Long userId, list<long> roleIds) {try {    Power.authorizeroletouser (UserId, roleids);  } catch (Motancustomexception ex) {if (Ex.getcode (). Equals (Msuserexception.notlogin (). GetCode ())) throw        Userexception.notlogin ();        if (Ex.getcode (). Equals (Mspowerexception.havenopower (). GetCode ())) throw Powerexception.havenopower ();    Throw ex; } catch (Motanserviceexception ex) {Cathelper.logeventservice ("Power-authorizeroletouser", "Authorizeroletouser",        Ex.getstatus (), Ex.geterrorcode (), Ex.getmessage ());    Throw ex;  } catch (Motanabstractexception ex) {Cathelper.logeventservice ("Power-authorizeroletouser", "Authorizeroletouser",        Ex.getstatus (), Ex.geterrorcode (), Ex.getmessage ());    Throw ex;        } catch (Exception ex) {cathelper.logerror (ex);    Throw ex; }}

I have learned and extracted the encapsulation, will try ... catch: Fetch is public, get these 2 methods.

Import java.util.function.supplier;public static <T> T tryCatch (supplier<t> Supplier, String serviceName,    String methodName) {try {return supplier.get ();  } catch (Motancustomexception ex) {if (Ex.getcode (). Equals (Msuserexception.notlogin (). GetCode ())) throw        Userexception.notlogin ();        if (Ex.getcode (). Equals (Mspowerexception.havenopower (). GetCode ())) throw Powerexception.havenopower ();    Throw ex; } catch (Motanserviceexception ex) {Cathelper.logeventservice (ServiceName + "-" + MethodName, MethodName, EX.GETST        ATUs (), Ex.geterrorcode (), Ex.getmessage ());    Throw ex; } catch (Motanabstractexception ex) {Cathelper.logeventservice (ServiceName + "-" + MethodName, MethodName, ex.gets        Tatus (), Ex.geterrorcode (), Ex.getmessage ());    Throw ex;        } catch (Exception ex) {cathelper.logerror (ex);    Throw ex; }}public static void TryCatch (Runnable Runnable, String serviceName, String methodName) {TryCatch ((), {runnable.run ();    return null; }, ServiceName, methodName);}

Now it's so simple to use. Like this non-return value:

public void Authorizeroletouser (Long userId, list<long> roleids) {    TryCatch (), { Power.authorizeroletouser (UserId, roleids); }, "Power", "Authorizeroletouser");}

And this has the return value:

Public list<roledto> Listrolebyuser (Long userId) {    return TryCatch ((), Power.listrolebyuser (userid), " Power "," Listrolebyuser ");}

This is my first Java article. In the process of learning Java, there are both surprises and disappointments. will continue to share the experience in the future.

Java: An example of simplifying code with lambda expressions