Batching

Each HTTP connection that your client makes results in overhead. To reduce overhead, you can batch multiple API calls together into a single HTTP request.

The main classes of interest are BatchRequest and JsonBatchCallback . The following example shows how to use these classes with service-specific generated libraries:

   JsonBatchCallback 
 < 
 Calendar 
 > 
 callback 
 = 
 new 
 JsonBatchCallback 
 < 
 Calendar 
 >() 
 { 
 public 
 void 
 onSuccess 
 ( 
 Calendar 
 calendar 
 , 
 HttpHeaders 
 responseHeaders 
 ) 
 { 
 printCalendar 
 ( 
 calendar 
 ); 
 addedCalendarsUsingBatch 
 . 
 add 
 ( 
 calendar 
 ); 
 } 
 public 
 void 
 onFailure 
 ( 
 GoogleJsonError 
 e 
 , 
 HttpHeaders 
 responseHeaders 
 ) 
 { 
 System 
 . 
 out 
 . 
 println 
 ( 
 "Error Message: " 
 + 
 e 
 . 
 getMessage 
 ()); 
 } 
 }; 
 ... 
 Calendar 
 client 
 = 
 Calendar 
 . 
 builder 
 ( 
 transport 
 , 
 jsonFactory 
 , 
 credential 
 ) 
 . 
 setApplicationName 
 ( 
 "BatchExample/1.0" 
 ). 
 build 
 (); 
 BatchRequest 
 batch 
 = 
 client 
 . 
 batch 
 (); 
 Calendar 
 entry1 
 = 
 new 
 Calendar 
 (). 
 setSummary 
 ( 
 "Calendar for Testing 1" 
 ); 
 client 
 . 
 calendars 
 (). 
 insert 
 ( 
 entry1 
 ). 
 queue 
 ( 
 batch 
 , 
 callback 
 ); 
 Calendar 
 entry2 
 = 
 new 
 Calendar 
 (). 
 setSummary 
 ( 
 "Calendar for Testing 2" 
 ); 
 client 
 . 
 calendars 
 (). 
 insert 
 ( 
 entry2 
 ). 
 queue 
 ( 
 batch 
 , 
 callback 
 ); 
 batch 
 . 
 execute 
 (); 
 
 

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