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| 78 | + <h1>Events and transactions</h1> |
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| 80 | + Thursday, May 18, 2017 11:37 AM </span> |
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| 88 | + <h2 id="page_How+collection+updates+are+processed">How collection updates are processed</h2> |
| 89 | +<p>All updates to the collections are executed in the scope of transactions, which are executed in 4 steps:</p> |
| 90 | +<ol> |
| 91 | +<li>Apply all changes to collection and nested records.</li> |
| 92 | +<li>Trigger <code>add</code>, <code>remove</code>, or <code>change</code> event for every individual record change.</li> |
| 93 | +<li>Trigger an <code>update</code> event when there are any records added or removed, and <code>sort</code> event if an order of records was changed.</li> |
| 94 | +<li>If any changes were applied to the collection: |
| 95 | +<ul> |
| 96 | +<li>trigger <code>changes</code> event;</li> |
| 97 | +<li>notify collection's owner on aggregation subtree changes.</li> |
| 98 | +</ul> |
| 99 | +</li> |
| 100 | +</ol> |
| 101 | +<p>Every collection update method opens an implicit transaction.</p> |
| 102 | +<h4 id="page_record.transaction%28+fun+%29">record.transaction( fun )</h4> |
| 103 | +<p>Execute the sequence of updates in <code>fun</code> function in the scope of the transaction, so it will trigger the single <code>change</code> event.</p> |
| 104 | +<h4 id="page_collection.updateEach%28+iteratee+%3A+%28+val+%3A+Record%2C+index+%29+%3D%3E+void%2C+context%3F+%29">collection.updateEach( iteratee : ( val : Record, index ) => void, context? )</h4> |
| 105 | +<p>Similar to the <code>collection.each</code>, but wraps an iteration in a transaction.</p> |
| 106 | +<h2 id="page_Listening+to+change+events">Listening to change events</h2> |
| 107 | +<p>TODO (Events API)</p> |
| 108 | +<h4 id="page_itemEvents+%3D+%7B+eventName+%3A++%2C+...+%7D"><code>static</code> itemEvents = { eventName : <code>handler</code>, ... }</h4> |
| 109 | +<p>Subscribe for events from records. The <code>hander</code> is either the collection's method name, the handler function, or <code>true</code>.</p> |
| 110 | +<p>When <code>true</code> is passed as a handler, the corresponding event will be triggered on the collection.</p> |
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