Batching API Calls in Java

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Batching API Calls
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Batching application programming interface (API) calls decreases page load times by reducing the number of round trips to the Facebook serverWe covered this for users of the Facebook JavaScript Client Library in 12, Facebook JavaScript Client Library; in this chapter we show how to use the batching API using the PHP client library Our example will be setting the profile box FBML content for multiple users Listing 161 shows how to do this both with and without batching Listing 161 extracts the first ten friends of the logged-in user and then executes the separateCalls() function to individually call profile_setFBML() for each user IDThis is the normal way to execute API functionsThe batchedCalls() function is then called Inside, before calling users_getInfo(), this function calls begin_batch(), which causes the PHP client library to delay executing subsequent API calls profile_setFBML() is called for each user, but notice that the result is returned by referenceThis is because the
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API call isn t executed until after batch_end() is calledAt that point, the references are filled in with the actual results In local tests, batching the API calls was about 5 6 times faster than individually executing the calls
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Listing 161 Batching API Calls
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$users = array_slice( $facebook->api_client->friends_list, 0, 10 ); separateCalls( $facebook, $users ); batchedCalls( $facebook, $users ); function separateCalls( $facebook, $users ) { $results = array(); foreach ( $users as $userID ) { $results[] = $facebook->api_client->profile_setFBML( NULL, $userID, "Some FBML", NULL, NULL, NULL ); } } function batchedCalls( $facebook, $users ){ $results = array(); $facebook->api_client->begin_batch(); foreach ( $users as $userID ) { $results[] = & $facebook->api_client->profile_setFBML( NULL, $userID, "Some FBML", NULL, NULL, NULL ); } $facebook->api_client->end_batch(); }
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Currently, there is a bug in the Facebook PHP client library with the profile_setFBML() declaration It doesn t return its value as a reference, so the results array in the batchedCalls() function won t be set You can fix this by changing the declaration to include an & in facebookapi_php5_restlibphp:
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function &profile_setFBML($markup,
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There are a few constraints with batching First, you can only batch 20 API calls at a time Second, you cannot use the results of one API call in another API call in the same batch (for example, calling the friends_getAppUsers() function and then using the IDs returned as parameters in a call to the users_getInfo() function)The solution to this problem is to use FQL, which the next section coversYou can, however, force the batched calls to be executed sequentially instead of in parallel, which is the default Do this by setting the batch_mode variable like this:
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$facebook->api_client->batch_mode = FacebookRestClient::BATCH_MODE_SERIAL_ONLY;
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You can set it back like this:
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$facebook->api_client->batch_mode = FacebookRestClient::BATCH_MODE_PARALLEL;
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All the batched calls are executed on the Facebook servers, even if one of them has an error Unfortunately, the PHP client library throws a FacebookRestClientException exception the first time it encounters an error as it parses the results of the batch runThis means that only those result references the library has already set at that point have values, and you won t know what happened with the rest of the batched calls
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FQL provides developers with a SQL-like interface to the data store that backs the Facebook Platform It has several advantages over using the API functions First, you can constrain the data returned, which can reduce query times and bandwidth Second, you can replace multiple API calls with FQL statements that use multiple tables instead FQL speed improvements are large enough that many of the API calls themselves just wrap FQL queries internallyWe start with an overview of FQL queries, use the fqlmultiquery() function to perform multiple queries that can reference each other, and finish with looking at how to run queries on page load using Preload FQL
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