Re: Is JTextArea.append(String) really thread safe?
On 7/19/2010 11:39 AM, markspace wrote:
So here's another thread safety question: is the
JTextArea.append(String) really thread safe? Here's the guts of the
method in question:
public void append(String str) {
Document doc = getDocument();
if (doc != null) {
try {
doc.insertString(doc.getLength(), str, null);
} catch (BadLocationException e) {
}
}
}
Note the call to getDocument() is unsynchronized. What does the
getDocument() method do? It's part of JTextComponent's API:
public Document getDocument() {
return model;
}
Things aren't looking good. Maybe field "model" is declared final or
volatile?
private Document model;
Ouch, it's just private. So, I conclude that the Swing docs lie and
append() is not thread safe. Can anyone show me where I went wrong?
The Document object itself is thread-safe, at least with regards to
insertString see:
<http://download.oracle.com/docs/cd/E17476_01/javase/1.4.2/docs/api/javax/swing/text/Document.html#insertString%28int,%20java.lang.String,%20javax.swing.text.AttributeSet%29>
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