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flushed out during development. Timeouts are the ones that you ll have to deal with. A simple and effective approach to dealing with both types of timeouts connection timeouts and socket timeouts is to wrap the execute method of your HTTP request with a try/catch and then retry if a failure occurs. This is demonstrated in Listing 8-5. Listing 8-5. Implementing a Simple Retry Technique to Deal with Timeouts import import import import import import import import java.io.BufferedReader; java.io.IOException; java.io.InputStreamReader; java.net.URI; org.apache.http.HttpResponse; org.apache.http.client.HttpClient; org.apache.http.client.methods.HttpGet; org.apache.http.impl.client.DefaultHttpClient;

Listing 3 27. The query() Method Implementation @Override public Cursor query(Uri uri, String[] projection, String selection , String[] selectionArgs, String sortOrder) { SQLiteQueryBuilder qb = new SQLiteQueryBuilder(); switch (sUriMatcher.match(uri)) { case INCOMING_BOOK_COLLECTION_URI_INDICATOR: qb.setTables(BookTableMetaData.TABLE_NAME);

qb.setProjectionMap(sBooksProjectionMap); break; case INCOMING_SINGLE_BOOK_URI_INDICATOR: qb.setTables(BookTableMetaData.TABLE_NAME); qb.setProjectionMap(sBooksProjectionMap); qb.appendWhere(BookTableMetaData._ID + "=" + uri.getPathSegments().get(1)); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } // If no sort order is specified use the default String orderBy; if (TextUtils.isEmpty(sortOrder)) { orderBy = BookTableMetaData.DEFAULT_SORT_ORDER; } else { orderBy = sortOrder; } // Get the database and run the query SQLiteDatabase db = mOpenHelper.getReadableDatabase(); Cursor c = qb.query(db, projection, selection, selectionArgs, null, null, orderBy); int i = c.getCount(); // Tell the cursor what uri to watch, // so it knows when its source data changes c.setNotificationUri(getContext().getContentResolver(), uri); return c; }

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} The parser defined as follows would be saved in a file called syslog_parser.mly (only because other code you have calls this code with that name). %{ let print_error msg lbuf = Printf.eprintf "%s at %i\n" msg (Lexing.lexeme_start_p lbuf).Lexing.pos_cnum let cond_concat x y = match x with "" -> y | _ -> x ^ " " ^ y;; %} %token COLON EOL EOF %token <string> WORD DATETIME %type <(string * string * string * string) list> main %start main %% main: lines EOF { $1 } ; lines: { [] } | lines line { $2 :: $1 } ; line: DATETIME WORD facility COLON message EOL { ($1,$2,$3,$5) } | DATETIME WORD facility EOL { ($1,$2,$3,"") }

public class TestHttpGet { public String executeHttpGetWithRetry() throws Exception { int retry = 3; int count = 0; while (count < retry) { count += 1; try { String response = executeHttpGet(); /** * if we get here, that means we were successful and we can * stop. */ return response; } catch (Exception e) { /** * if we have exhausted our retry limit */ if (count < retry) { /** * we have retries remaining, so log the message and go * again. */ System.out.println(e.getMessage()); } else { System.out.println("could not succeed with retry..."); throw e; } } }

The insert method in a content provider is responsible for inserting a record into the underlying database and then returning a URI that points to the newly created record. Like the other methods, insert uses UriMatcher to identify the URI type. The code first checks whether the URI indicates the proper collection-type URI. If not, the code throws an exception (see Listing 3 28). The code then validates the optional and mandatory column parameters. The code can substitute default values for some columns if they are missing. Next, the code uses a SQLiteDatabase object to insert the new record and returns the newly inserted ID. In the end, the code constructs the new URI using the returned ID from the database.

Listing 3 28. The insert() Method Implementation @Override public Uri insert(Uri uri, ContentValues values) { // Validate the requested uri

facility: { "" } | facility word { cond_concat $1 $2 } ; message: { "" } | message word { cond_concat $1 $2 } | message COLON { $1 } | message DATETIME { cond_concat $1 $2 } ; word: WORD { $1 } ;

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