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Even after the runtime converts the CIL code to machine code and starts to execute, it continues to maintain control of its execution The code that executes under the context of an agent such as the runtime is managed code, and the process of executing under control of the runtime is managed execution The control over execution transfers to the data; this makes it managed data because memory for the data is automatically allocated and de-allocated by the runtime Somewhat inconsistently, the term Common Language Runtime (CLR) is not technically a generic term that is part of the CLI Rather, CLR is the Microsoft-specific implementation of the runtime for the NET platform Regardless, CLR is casually used as a generic term for runtime, and the technically accurate term, Virtual Execution System, is seldom used outside the context of the CLI specification Because an agent controls program execution, it is possible to inject additional services into a program, even though programmers did not explicitly code for them Managed code, therefore, provides information to allow these services to be attached Among other items, managed code enables the location of metadata about a type member, exception handling, access to security information, and the capability to walk the stack The remainder of this section includes a description of some additional services made available via the runtime and managed execution The CLI does not explicitly require all of them, but the established CLI platforms have an implementation of each

Each TreeViewerColumn has a ColumnLabelProvider associated with it:

Garbage Collection Garbage collection is the process of automatically de-allocating memory based on the program s needs This is a significant programming problem for languages that don t have an automated system for doing this Without the garbage collector, programmers must remember to always free any memory allocations they make Forgetting to do so, or doing so repeatedly

column1setLabelProvider(new ColumnLabelProvider() { public String getText(Object element) { return treeLabelProvidergetColumnText(element, 0); } }); column2setLabelProvider(new ColumnLabelProvider() { public String getText(Object element) { return treeLabelProvidergetColumnText(element, 1); } });

for the same memory allocation, introduces memory leaks or corruption into the program, something exacerbated by long-running programs such as web servers Because of the runtime s built-in support for garbage collection, programmers targeting runtime execution can focus on adding program features rather than plumbing related to memory management

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In the first column, the user can edit either the category name or the key of a key/value pair EditingSupport is responsible for instantiating an appropriate cell editor, obtaining the appropriate text for cell editor, and saving the modified text back into the model

The exact mechanics for how the garbage collector works are not part of the CLI specification; therefore, each implementation can take a slightly different approach (In fact, garbage collection is one item not explicitly required by the CLI) One key concept that may take C++ programmers a little getting used to is that garbage-collected objects are not necessarily collected deterministically (at well-defined, compile-time-known locations) In fact, objects can be garbage-collected anytime between when they are last accessed and when the program shuts down This includes collection prior to falling out of scope, or waiting until well after an object instance is accessible by the code

Example 34 CustomerNameAddress 1st revision by derivation public class CustomerNameAddress2 extends CustomerNameAddress { static final long serialVersionUID = 2886216206605149603L; private StringaddressLine3;// added in revision 2 //

column1setEditingSupport(new EditingSupport(treeViewer) { TextCellEditor editor = null; protected boolean canEdit(Object element) { return true; } protected CellEditor getCellEditor(Object element) { if (editor == null) { Composite tree = (Composite) treeViewergetControl(); editor = new TextCellEditor(tree); } return editor; } protected Object getValue(Object element) { return treeLabelProvidergetColumnText(element, 0); } protected void setValue(Object element, Object value) { String text = ((String) value)trim(); if (element instanceof PropertyCategory) ((PropertyCategory) element)setName(text); if (element instanceof PropertyEntry) ((PropertyEntry) element)setKey(text); } });

It should be noted that the garbage collector only takes responsibility for handling memory management It does not provide an automated system for managing resources unrelated to memory Therefore, if an explicit action to free a resource (other than memory) is required, programmers using that resource should utilize special CLI-compatible programming patterns that will aid in the cleanup of those resources (see 9)

We create a similar EditingSupport object for the second column, but modify it to allow editing of the value in a key/value pair:

Garbage Collection on NET The NET platform implementation of garbage collection uses a generational, compacting, mark-and-sweep-based algorithm It is generational because objects that have lived for only a short period will be cleaned up sooner than objects that have already survived garbage collection sweeps because they were still in use This conforms to the general pattern of memory allocation that objects that have been around longer will continue to outlive objects that have only recently been instantiated

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