csantanapr closed pull request #99: Add an optional batch mode
URL: https://github.com/apache/incubator-openwhisk-package-cloudant/pull/99
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diff --git a/provider/lib/constants.js b/provider/lib/constants.js
index 57e6d58..b279256 100644
--- a/provider/lib/constants.js
+++ b/provider/lib/constants.js
@@ -2,10 +2,12 @@ const TRIGGER_DB_SUFFIX = 'cloudanttrigger';
const DEFAULT_MAX_TRIGGERS = -1;
const RETRY_ATTEMPTS = 10;
const RETRY_DELAY = 1000; //in milliseconds
+const BATCH_INTERVAL_MS = 1000;
module.exports = {
TRIGGER_DB_SUFFIX: TRIGGER_DB_SUFFIX,
DEFAULT_MAX_TRIGGERS: DEFAULT_MAX_TRIGGERS,
RETRY_ATTEMPTS: RETRY_ATTEMPTS,
- RETRY_DELAY: RETRY_DELAY
+ RETRY_DELAY: RETRY_DELAY,
+ BATCH_INTERVAL_MS: BATCH_INTERVAL_MS
};
diff --git a/provider/lib/utils.js b/provider/lib/utils.js
index 94af602..f58de96 100644
--- a/provider/lib/utils.js
+++ b/provider/lib/utils.js
@@ -63,19 +63,39 @@ module.exports = function(
dataTrigger.feed = feed;
that.triggers[dataTrigger.id] = dataTrigger;
- feed.on('change', function (change) {
- logger.info(method, 'Trigger', dataTrigger.id, 'got change
from', dataTrigger.dbname);
+ var batchedChanges = [];
+ var fireTrigger = function (payload) {
var triggerHandle = that.triggers[dataTrigger.id];
if (triggerHandle && (triggerHandle.maxTriggers === -1 ||
triggerHandle.triggersLeft > 0)) {
try {
- that.fireTrigger(dataTrigger.id, change);
+ that.fireTrigger(dataTrigger.id, payload);
} catch (e) {
logger.error(method, 'Exception occurred while firing
trigger', dataTrigger.id, e);
}
}
+ };
+
+ feed.on('change', function (change) {
+ logger.info(method, 'Trigger', dataTrigger.id, 'got change
from', dataTrigger.dbname);
+
+ if(dataTrigger.batchChanges) {
+ batchedChanges.push(change);
+ } else {
+ fireTrigger(change);
+ }
});
+ if(dataTrigger.batchChanges) {
+ var triggerHandle = that.triggers[dataTrigger.id];
+ triggerHandle.interval = setInterval(function() {
+ if(batchedChanges.length > 0) {
+ fireTrigger(batchedChanges);
+ batchedChanges = [];
+ }
+ }, constants.BATCH_INTERVAL_MS);
+ }
+
feed.follow();
return new Promise(function(resolve, reject) {
@@ -301,6 +321,11 @@ module.exports = function(
if (trigger) {
logger.info(method, 'Stopped cloudant trigger', id, 'listening for
changes in database', trigger.dbname);
trigger.feed.stop();
+
+ if(trigger.interval) {
+ clearInterval(trigger.interval);
+ }
+
delete that.triggers[id];
} else {
logger.info(method, 'trigger', id, 'could not be found in the
trigger list.');
@@ -308,14 +333,19 @@ module.exports = function(
}
};
- this.fireTrigger = function (id, change) {
+ this.fireTrigger = function (id, changes) {
var method = 'fireTrigger';
var dataTrigger = that.triggers[id];
var apikey = dataTrigger.apikey;
var triggerObj = that.parseQName(dataTrigger.id);
- var form = change;
+ var form; // the trigger payload
+ if(Array.isArray(changes)) {
+ form = { 'changes': changes };
+ } else {
+ form = changes;
+ }
form.dbname = dataTrigger.dbname;
logger.info(method, 'firing trigger', dataTrigger.id, 'with db
update');
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