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if (sUriMatcher.match(uri) != INCOMING_BOOK_COLLECTION_URI_INDICATOR) { throw new IllegalArgumentException("Unknown URI " + uri); } Long now = Long.valueOf(System.currentTimeMillis()); //validate input fields // Make sure that the fields are all set if (values.containsKey(BookTableMetaData.CREATED_DATE) == false) { values.put(BookTableMetaData.CREATED_DATE, now); } if (values.containsKey(BookTableMetaData.MODIFIED_DATE) == false) { values.put(BookTableMetaData.MODIFIED_DATE, now); } if (values.containsKey(BookTableMetaData.BOOK_NAME) == false) { throw new SQLException( "Failed to insert row because Book Name is needed " + uri); } if (values.containsKey(BookTableMetaData.BOOK_ISBN) == false) { values.put(BookTableMetaData.BOOK_ISBN, "Unknown ISBN"); } if (values.containsKey(BookTableMetaData.BOOK_AUTHOR) == false) { values.put(BookTableMetaData.BOOK_ISBN, "Unknown Author"); } SQLiteDatabase db = mOpenHelper.getWritableDatabase(); long rowId = db.insert(BookTableMetaData.TABLE_NAME , BookTableMetaData.BOOK_NAME, values); if (rowId > 0) { Uri insertedBookUri = ContentUris.withAppendedId( BookTableMetaData.CONTENT_URI, rowId); getContext().getContentResolver().notifyChange(insertedBookUri, null); return insertedBookUri; } throw new SQLException("Failed to insert row into " + uri); }

return null; } public String executeHttpGet() throws Exception { BufferedReader in = null; try { HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(); request.setURI(new URI("http://code.google.com/android/")); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity() .getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while ((line = in.readLine()) != null) { sb.append(line + NL); } in.close(); String result = sb.toString(); return result; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } } The code in Listing 8-5 shows how you can implement a simple retry technique to recover from timeouts when making HTTP calls. The listing shows two methods: one that executes an HTTP GET (executeHttpGet()), and another that wraps this method with the retry logic (executeHttpGetWithRetry()). The logic is very simple. We set the number of retries we want to attempt to 3, and then we enter a while loop. Within the loop, we execute the request. Note that the request is wrapped with a try/catch block, and in the catch block we check whether we have exhausted the number of retry attempts. When using the HttpClient as part of a real-world application, you need to pay some attention to multithreading issues that might come up. Let s delve into this now.

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The update method in a content provider is responsible for updating a record based on the column values passed in, as well as the where clause that is passed in. The update method then returns the number of rows updated in the process. Like the other methods, update uses UriMatcher to identify the URI type. If the URI type is a collection, the where clause is passed through so it can affect as many records as possible. If the URI type is a single-record type, then the book ID is extracted from the URI and specified as an additional where clause. In the end, the code returns the number of records updated (see Listing 3 29). 12 fully explains the implications of this notifyChange method. Also notice how this notifyChange method enables you to announce to the world that the data at that URI has changed. Potentially, you can do the

Listing 3 29. The update() Method Implementation @Override public int update(Uri uri, ContentValues values, String where, String[] whereArgs) { SQLiteDatabase db = mOpenHelper.getWritableDatabase(); int count; switch (sUriMatcher.match(uri)) { case INCOMING_BOOK_COLLECTION_URI_INDICATOR: count = db.update(BookTableMetaData.TABLE_NAME, values, where, whereArgs); break; case INCOMING_SINGLE_BOOK_URI_INDICATOR: String rowId = uri.getPathSegments().get(1); count = db.update(BookTableMetaData.TABLE_NAME , values , BookTableMetaData._ID + "=" + rowId + (!TextUtils.isEmpty(where) " AND (" + where + ')' : "") , whereArgs); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } getContext().getContentResolver().notifyChange(uri, null); return count; }

You can use the following OCamlMakefile to build the code: SOURCES = syslog_parser.mly syslog_lexer.mll RESULT = syslog.exe OUTPUT = byte-code include /usr/local/share/OCamlMakefile The build output should look similar to the following. /home/josh/doc/OcamlBook/multi-line-log $ make.exe -f makefile.syslog ocamllex syslog_lexer.mll 18 states, 630 transitions, table size 2628 bytes make[1]: Entering directory `/cygdrive/c/Documents and Settings/josh/My Documents/OcamlBook/multi-line-log' making ._bcdi/syslog_parser.di from syslog_parser.mli making ._d/syslog_parser.d from syslog_parser.ml making ._d/syslog_lexer.d from syslog_lexer.ml make[1]: Leaving directory `/cygdrive/c/Documents and Settings/josh/My Documents/OcamlBook/multi-line-log' make[1]: Entering directory `/cygdrive/c/Documents and Settings/josh/My Documents/OcamlBook/multi-line-log' ocamlc -c syslog_lexer.ml ocamlc -o syslog.exe syslog_parser.cmo syslog_lexer.cmo make[1]: Leaving directory `/cygdrive/c/Documents and Settings/josh/My Documents/OcamlBook/multi-line-log' Then, if you run the application, you should see the last line in the file displayed with the spaces turned into seperators. /home/josh/doc/OcamlBook/multi-line-log $ ./syslog.exe Nov 22 21:04:46|bebop|kernel|BIOS-provided physical RAM map /home/josh/doc/OcamlBook/multi-line-log $

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