{"id":2902,"date":"2017-03-07T08:42:52","date_gmt":"2017-03-07T16:42:52","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2902"},"modified":"2025-06-13T20:09:45","modified_gmt":"2025-06-14T03:09:45","slug":"determining-status-replication-couchbase-lite","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/determining-status-replication-couchbase-lite\/","title":{"rendered":"Determining Status of a Replication in Couchbase Lite"},"content":{"rendered":"
\"\"

Courtesy of Andr\u00e9s Nieto Porras (https:\/\/www.flickr.com\/photos\/anieto2k)<\/p><\/div>\n

Couchbase Lite<\/a> runs replications (syncs) using background threads. Starting and stopping replications doesn’t happen synchronously. This can lead to mistakes in detecting the state of a replication.<\/p>\n

The Replication class<\/a> has, depending on platform, either a running<\/code> property or a convenience routine like isRunning()<\/code>. This is a lightweight way of checking the status of a replication.<\/p>\n

Using it can lead to unexpected results, though. For example, I recently wrote a utility that uses continuous replications. I have a toggle button to start and stop them. It’s tempting to use isRunning<\/code> to update the button state. Turns out this is a bad idea. Not surprising, given changes happen in the background, but easy to overlook.<\/p>\n

Instead, the preferred approach uses a change listener. Here’s an example.<\/p>\n

We have two classes. The database helper class wraps some standard operations for simplicity. I added an interface to employ a callback pattern. The client class has to implement it. The helper class digests the Couchbase Lite change notification before passing anything to the client. This gives a nice separation of concerns.<\/p>\n

The code listings below are outlines. They only show essentials. Let’s look at the helper class first.<\/p>\n

public class DBHelper implements Replication.ChangeListener {\r\n  private boolean replicationActive = false;\r\n  private List stateListeners = new ArrayList&lt;&gt;();\r\n  ...\r\n\r\n  public interface ReplicationStateListener {\r\n    void onChange(boolean isActive);\r\n  }\r\n\r\n  public void startReplication(URL gateway, boolean continuous) {\r\n    ...\r\n\r\n    pushReplication.addChangeListener(this);\r\n    pushReplication.start();\r\n  }\r\n\r\n  public void stopReplication() {\r\n    ...\r\n  }\r\n\r\n  public void addReplicationStateListener(ReplicationStateListener listener) {\r\n    stateListeners.add(listener);\r\n  }\r\n\r\n  public void removeReplicationStateListener(ReplicationStateListener listener) {\r\n    stateListeners.remove(listener);\r\n  }\r\n\r\n  \/\/ Replication.ChangeListener\r\n  @Override\r\n  public void changed(Replication.ChangeEvent changeEvent) {\r\n    if (changeEvent.getError() != null) {\r\n      Throwable lastError = changeEvent.getError();\r\n\r\n      \/\/ React to the error\r\n\r\n      return;\r\n    }\r\n\r\n    if (changeEvent.getTransition() == null) return;\r\n\r\n    ReplicationState dest = changeEvent.getTransition().getDestination();\r\n\r\n    replicationActive = ((dest == ReplicationState.STOPPING || dest == ReplicationState.STOPPED) ? false : true);\r\n\r\n    stateListeners.forEach(listener -> listener.onChange(replicationActive));\r\n  }\r\n}<\/pre>\n
We see that DBHelper implements the Replication.ChangeListener<\/code> interface. This is an interface defined by Couchbase Lite. In startReplication<\/code> we add this listener to the replication. It has one method to override, changed<\/code>. The ChangeEvent<\/code> passed in can have several different values. In the example, I check for errors first and notify the user if one occurs. Otherwise I check to see if this is a replication state transition event. The destination state can be one of INITIAL<\/code>, RUNNING<\/code>, IDLE<\/code>, OFFLINE<\/code>, STOPPING<\/code>, or STOPPED<\/code>.<\/p>\n
In this case I just want to know if the replication is shutting down, so I simplify the return value. I allow clients to register more than one listener, so the last bit of code loops over all the callbacks and invokes them.<\/p>\n
The client class is even simpler. I have the class implement the needed interface from the helper class. Just register the listener during instance construction, and have onChange<\/code> do whatever you need in the UI.<\/p>\n
public class Client implements DBHelper.ReplicationStateListener {\r\n  private DBHelper service = DBHelper.getInstance();\r\n  ...\r\n\r\n  public Client() {\r\n    service.addReplicationStateListener(this);\r\n  }\r\n\r\n  ...\r\n\r\n  \/\/ DBHelper.ReplicationStateListener\r\n  @Override\r\n  public void onChange(boolean isActive) {\r\n    \/\/ Code to handle the change\r\n  }\r\n}<\/code><\/pre>\n
This code is drawn from a tool I built. Read about the tool itself in this post<\/a>.You can find the source code on GitHub here<\/a>.<\/p>\n
Postscript<\/h2>\n
Check out more resources on our developer portal<\/a> and follow us on Twitter @CouchbaseDev<\/a>.<\/p>\n
You can post questions on our forums<\/a>. And we actively participate on Stack Overflow<\/a>.<\/p>\n
Hit me up on Twitter @HodGreeley<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Couchbase Lite runs replications (syncs) using background threads. Starting and stopping replications doesn’t happen synchronously. This can lead to mistakes in detecting the state of a replication. The Replication class has, depending on platform, either a running property or a […]<\/p>\n","protected":false},"author":73,"featured_media":2919,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1815,7667,1810],"tags":[1562],"ppma_author":[9042],"class_list":["post-2902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-best-practices-and-tutorials","category-couchbase-lite","category-couchbase-mobile","tag-replication"],"acf":[],"yoast_head":"\nDetermining Status of a Replication in Couchbase Lite - The Couchbase Blog<\/title>\n<meta name=\"description\" content=\"This blog focuses on how to use Replication class and change listener for checking the status of replication in Couchbase Lite.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/determining-status-replication-couchbase-lite\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Determining Status of a Replication in Couchbase Lite\" \/>\n<meta property=\"og:description\" content=\"This blog focuses on how to use Replication class and change listener for checking the status of replication in Couchbase Lite.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.couchbase.com\/blog\/determining-status-replication-couchbase-lite\/\" \/>\n<meta property=\"og:site_name\" content=\"The Couchbase Blog\" \/>\n<meta property=\"article:published_time\" content=\"2017-03-07T16:42:52+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-14T03:09:45+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2017\/03\/19300545790_82ac2a3444_z.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"640\" \/>\n\t<meta property=\"og:image:height\" content=\"427\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Hod Greeley, Developer Advocate, Couchbase\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@HodGreeley\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Hod Greeley, Developer Advocate, Couchbase\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.couchbase.com\/blog\/determining-status-replication-couchbase-lite\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/determining-status-replication-couchbase-lite\/\"},\"author\":{\"name\":\"Hod Greeley, Developer Advocate, Couchbase\",\"@id\":\"https:\/\/www.couchbase.com\/blog\/#\/schema\/person\/9b62593c8a13531e53d52fcd5aabbca4\"},\"headline\":\"Determining Status of a Replication in Couchbase Lite\",\"datePublished\":\"2017-03-07T16:42:52+00:00\",\"dateModified\":\"2025-06-14T03:09:45+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/determining-status-replication-couchbase-lite\/\"},\"wordCount\":434,\"commentCount\":2,\"publisher\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/determining-status-replication-couchbase-lite\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2017\/03\/19300545790_82ac2a3444_z.jpg\",\"keywords\":[\"replication\"],\"articleSection\":[\"Best Practices and Tutorials\",\"Couchbase Lite\",\"Couchbase Mobile\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.couchbase.com\/blog\/determining-status-replication-couchbase-lite\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.couchbase.com\/blog\/determining-status-replication-couchbase-lite\/\",\"url\":\"https:\/\/www.couchbase.com\/blog\/determining-status-replication-couchbase-lite\/\",\"name\":\"Determining Status of a Replication in Couchbase Lite - 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