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ListenForEPLAppChanges.mon
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ListenForEPLAppChanges.mon
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/**
* Title: ListenForEPLAppChanges.mon
* Description: EPL utility to listen for Cumulocity ManagedObjects that represent individual "EPL App" entities for the apama-ctrl microservice of Apama Streaming Analytics within Cumulocity IoT.
* Source: https://github.com/kpalf/EPLApps_ListenForEPLAppChanges
*
* WARNING: The structure of a ManagedObjects representing an "EPL App" is not public or documented and may be subject to change.
*
*
* Copyright (c) 2022 Kevin Palfreyman
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
* file except in compliance with the License. You may obtain a copy of the License at
* http:/www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied.
* See the License for the specific language governing permissions and limitations under the License.
*/
using com.apama.cumulocity.ManagedObject;
using com.apama.cumulocity.Util;
/**
* A simple event to represent and EPL file from the inventory, with just enough basic info to demonstrate changes.
* Note that the structure of a ManagedObjects representing an "EPL App" is not public or documented and may be subject to change.
*/
event EPLFile {
constant string MOTYPE_EPLFILE := "apama_eplfile";
string name; // from the MO.name
string eplfile_contents; // from the MO.params["apama_eplfile"]["contents"] - the escaped EPL
string eplfile_description; // from the MO.params["apama_eplfile"]["description"] - empty string or description
string eplfile_state; // from the MO.params["apama_eplfile"]["state"] - always either "active", or "inactive"
float lastUpdated; // from the MO.params[lastUpdated]
/** Static factory action to create an instance of an EPLFile event from a ManagedObject of the correct type. */
static action fromMO(ManagedObject mo) returns EPLFile {
EPLFile file := new EPLFile;
if (MOTYPE_EPLFILE != mo.type) {
log "ManagedObject is not of type \""+MOTYPE_EPLFILE+"\"" at WARN;
}
else {
file.name:=mo.name;
file.lastUpdated:=<float> mo.params.getOrDefault("lastUpdated");
dictionary<any,any> apama_eplfile := <dictionary<any,any>>mo.params.getOrDefault("apama_eplfile");
file.eplfile_contents:=<string>apama_eplfile.getOrDefault("contents");
file.eplfile_description:=<string>apama_eplfile.getOrDefault("description");
file.eplfile_state:=<string>apama_eplfile.getOrDefault("state");
}
return file;
} // action fromMO()
/** A quick string representation of just the metadata without the actual EPL content. */
action metadataToString() returns string {
return "\""+name+"\", \""+eplfile_description+"\", \""+eplfile_state+"\", \""+Util.formatTime(lastUpdated)+"\"";
} // action metadataToString()
} // event EPLFile
/** Simple monitor that will listen for all ManagedObject events of the type related to apama EPL files, parse those, and log some metadata. */
monitor ListenForEPLAppChanges {
action onload() {
monitor.subscribe(ManagedObject.SUBSCRIBE_CHANNEL);
on all ManagedObject(type=EPLFile.MOTYPE_EPLFILE) as mo {
EPLFile eplfile := EPLFile.fromMO(mo);
log "*** ListenForEPLAppChanges - MO received indicating an EPLApp file was changed with the following metadata: "+eplfile.metadataToString() at INFO;
// do something else with the information....
}
} // onload()
} // monitor ListenForEPLAppChanges