This method can be called safely from any thread.
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TreeMapper treeMapper = page.getTreeMapper(); treeMapper.startWait(); try { treeMapper.openSourceDataFile(sourceFile); } finally { treeMapper.stopWait(); } } @Override public void handle(Boolean ok) {
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} if (atLeastOneFileOpened && askForAttentionWhenDone) { page.askForAttention(); } } finally { treeMapper.stopWait(); } } @Override public void handle(Boolean ok) {