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Scalars are the simplest tied object class to implement. The constructor may take any arguments it likes, and the only other method that needs to handle an argument is STORE. Note that the constructor is the only method we call directly, so we cannot pass extra arguments to the other methods even if we wanted to; all information required must be conveyed by the object.

Arrays require the same methods as scalars, but they take an additional index argument for both FETCH and STORE. These are the constructor/destructor methods for arrays:

String contentType = connection.getHeaderField("Content-type"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); InputStream responseData = connection.openInputStream(); byte[] buffer = new byte[10000]; int bytesRead = responseData.read(buffer); while(bytesRead > 0) { baos.write(buffer, 0, bytesRead); bytesRead = responseData.read(buffer); } baos.close(); connection.close(); screen.requestSucceeded(baos.toByteArray(), contentType); } catch (IOException ex) { screen.requestFailed(ex.toString()); } }

tie @array, Class::Name, @list; undef @array; untie @array;

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When deciding on what to cache, identify the data associated with functionality that is time-consuming and see what portion of this data can be cached; the closer the data is to the client, the better the performance Consider the sensitivity of the data Some applications must protect the data they use For example, if you are writing a smart client that allows users to manage medical claims information or bank account information, you must look very closely at what can and cannot be cached on the client Privacy laws may not allow you to push this data to the client unless you can guarantee that it is going to be protected We ll talk about handling sensitive data in more detail in the final section of this chapter Identify minimum system requirements Smart clients are smart because they make intelligent use of the client s resources.

The accessor/mutator methods for arrays are as follows:

$value = $array[$index]; $array[$index] = $value; delete $array[$index]; exists $arrat[$index];

Interestingly, tied arrays may implement semantics for delete and exists. Even though these make no sense for real arrays, it is possible they might mean something to a tied array class. It would be possible to implement delete in terms of splice, for instance. Prior to Perl 5.8.1, negative index values are automatically converted into appropriate positive values by calling FETCHSIZE (covered in a moment) to determine the actual size of the array and then subtracting the index from it, as happens for built-in arrays. From 5.8.1 onwards this behavior can be disabled by setting a package variable in the tied class $NEGATIVE_INDICES to a true value, for example: package My::Tied::Class use base Tied::Array; our $NEGATIVE_INDICES=1; This change permits classes that want to treat negative indices as special cases the ability to do so. For older Perls, this variable, of course, has no effect, and the index seen by FETCH, STORE, DELETE, and EXISTS is always positive. We also need implementations for the push, pop, shift, unshift, and splice functions if we want to be able to use these functions on our tied arrays:

The first couple of lines set up the connection parameters:

push @array, @list; $value = pop @array; $value = shift @array; unshift @array, @list; splice @array, $offset, $length, @list;

Finally, we need methods to handle the extension or truncation of the array. Unique to arrays are the EXTEND, FETCHSIZE, and STORESIZE methods, which implement implicit and explicit alterations the extent of the array; real arrays do this through $#array, as covered in 5. The extension/truncation methods for arrays are as follows:

In deciding what and how much to cache, you need to carefully consider the smart client target machine/device..

@array = (); $array[$size] = $value; $size = $#array; $#array = $size;

Hashes are more complex than arrays, but ironically are easier to implement. Here are the constructor/destructor methods for hashes:

HttpConnection connection = (HttpConnection)Connector.open(url); connection.setRequestMethod(method);

tie %hash, Class::Name, @list; undef %hash; untie %hash;

Like arrays, the FETCH and STORE methods take an additional argument, this time of a key name. The accessor/mutator methods for hashes are as follows:

$value = $hash{$key}; $hash{$key} = $value; $hasvalues = %hash;

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