FROM EVENT ING TO JOB PROCESS ING

Carsten Ziegeler | Adobe Research Switzerland

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•  RnD Team at Adobe Research Switzerland •  Co-founder Adobe Granite

•  OSGi Core Platform and Enterprise Expert Groups •  Member of the ASF

•  Current PMC Chair of Apache Sling •  Apache Sling, Felix, ACE

•  Conference Speaker •  Technical Reviewer •  Article/Book Author

cziegele@adobe.com @cziegeler

ABOUT

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OVERVIEW Where to fit in the stack

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

Felix OSGi Event Admin

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OVERVIEW Where to fit in the stack

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

Felix OSGi Event Admin

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OSGI EVENT ADMIN Publish / Subscribe Model

OSGi Event Admin Component

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publish deliver

Component X

Component Y

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•  OSGi event is a data object with •  Topic (hierarchical namespace) •  Properties (key-value-pairs)

•  Page Event •  Topic: com/day/cq/wcm/core/page •  Properties: path, change type (add/remove/edit) etc.

OSGI EVENT ADMIN Publish / Subscribe Model

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•  Publisher creates event object •  Sends event through EventAdmin service •  Either sync or async delivery

•  Subscriber is an OSGi service (EventHandler) •  Service registration properties •  Interested topic(s)

•  com/day/cq/wcm/core/* •  Additional filters (optional)

•  (type="add“)

OSGI EVENT ADMIN Publish / Subscribe Model

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•  Immediate delivery to available subscribers •  No guarantee of delivery •  No distributed delivery

OSGI EVENT ADMIN Publish / Subscribe Model

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•  Immediate delivery to available subscribers •  No guarantee of delivery •  No distributed delivery

OSGI EVENT ADMIN Publish / Subscribe Model

Discovery Sling Job Distribution

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OVERVIEW Where to fit in the stack

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

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OVERVIEW Where to fit in the stack

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution New in 5.6.1

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INSTALLAT ION SCENARIOS

Clustered CRX

Single Instance

CRX

Instance 1

Instance 2

Instance 3

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Instance: Unique Id (Sling ID)

TOPOLOGIES I Apache Sling Discovery

Clustered CRX CRX

ID : A ID : X ID : 42 ID : 1

Single Instance

Instance 1

Instance 2

Instance 3

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•  Instance: Unique Id (Sling ID) •  Cluster: Unique Id and leader

TOPOLOGIES I Apache Sling Discovery

Cluster 99

Cluster 35

Clustered CRX CRX

ID : A ID : X ID : 42 ID : 1

Single Instance

Instance 1

Instance 2

Instance 3

Leader Leader

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•  Topology: Set of clusters

TOPOLOGIES I Apache Sling Discovery

Cluster 99

Cluster 35

Clustered CRX CRX

ID : A ID : X ID : 42 ID : 1

Single Instance

Instance 1

Instance 2

Instance 3

Leader Leader

Topology Topology

•  Instance: Unique Id (Sling ID) •  Cluster: Unique Id and leader

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TOPOLOGIES I Apache Sling Discovery

•  Instance: Unique Id (Sling ID) •  Cluster: Unique Id and leader

•  Topology: Set of clusters

Cluster 99

Clustered CRX CRX

ID : A ID : X ID : 42 ID : 1

Single Instance

Instance 1

Instance 2

Instance 3

Leader

Topology

Cluster 35

Leader

Cluster 99

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•  Instance •  Sling ID •  Optional: Name and description •  Belongs to a cluster •  Might be the cluster leader •  Additional properties which are distributed

•  Extensible through own services (PropertyProvider) •  E.g. data center, region or enabled job topics

•  Cluster •  Elects (stable) leader •  Stable instance ordering

•  TopologyEventListener: receives events on topology changes

TOPOLOGIES I I Apache Sling Discovery

ID : 42

Instance 3

Topology

Leader

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OVERVIEW Where to fit in the stack

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

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•  Job : Guaranteed processing, exactly once •  Exactly one job consumer

•  Started by client code, e.g. for replication, workflow... •  Job topic •  Payload is a serializable map

JOB HANDLING I Apache Sling Job Handling

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•  Sling Job Manager handles and distributes jobs •  Delivers job to a job consumer… •  …and waits for response •  Retry and failover

•  Notification listeners (fail, retry, success)

JOB HANDLING I Apache Sling Job Handling

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S TART ING / PROCESS ING A JOB I Apache Sling Job Handling

public interface JobConsumer { String PROPERTY_TOPICS = "job.topics"; enum JobResult { OK, FAILED, CANCEL, ASYNC } JobResult process(Job job);}

public interface JobManager { Job addJob(String topic, String optionalName, Map<String, Object> properties); …}

Starting a job

Processing a job

Note: Starting/processing of jobs through Event Admin is deprecated but still supported

New in 5.6.1

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@Component@Service(value={JobConsumer.class})@Property(name=JobConsumer.PROPERTY_TOPICS, value="org/apache/sling/jobs/backup")public class BackupJobConsumer implements JobConsumer { @Override public JobResult process(final Job job) { // do backup return JobResult.OK; }}

S TART ING / PROCESS ING A JOB I I Apache Sling Job Handling

New in 5.6.1

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•  New jobs are immediately persisted (resource tree / repository) •  Jobs are “pushed” to the processing instance •  Processing instances use different queues

•  Associated with job topic(s) •  Main queue •  0..n custom queues

•  For example: replication agent queue or workflow queue

JOB HANDLING I I Apache Sling Job Handling

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•  Queue is configurable •  Queue is started on demand in own thread

•  And stopped if unused for some time •  Types

•  Ordered queue (eg replication) •  Parallel queues: Plain and Topic Round Robin (eg workflow)

•  Limit for parallel threads per queue •  Number of retries (-1 = endless) •  Retry delay •  Thread priority

JOB QUEUE Apache Sling Job Handling

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•  Job Manager Configuration = Main Queue Configuration •  Maximum parallel jobs (15) •  Retries (10) •  Retry Delay

•  Eventing Thread Pool Configuration •  Used by all queues •  Pool size (35) = Maximum parallel jobs for a single instance

ADDIT IONAL CONFIGURAT IONS Apache Sling Job Handling

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MONITORING – WEB CONSOLE Apache Sling Job Handling

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MONITORING – WEB CONSOLE Apache Sling Job Handling

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•  Each instance determines enabled job topics •  Derived from Job Consumers (new API required) •  Can be whitelisted/blacklisted (in Job Consumer Manager) •  Announced through Topology

•  Job Distribution depends on enabled job topics and queue type •  Potential set of instances derived from topology (enabled job topics) •  Ordered : processing on leader only, one job after the other •  Parallel: Round robin distribution on all potential instances

•  Local cluster instances have preference

•  Failover •  Instance crash: leader redistributes jobs to available instances

•  Leader change taken into account

•  On enabled job topics changes: potential redistribution

JOB DISTR IBUT ION Apache Sling Job Handling

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•  Scalability in AEM: •  DAM Ingestion •  Non-Clustered installation requirement

•  The term Offloading: •  In AEM used for all things job distribution and topology in clustered and non-

clustered installations, e.g. ‘Offloading Browser’ •  More technically it’s ‘only’ a little add-on in Granite to Sling Job Distribution

for handling non-clustered installations

WHY OFFLOADING

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OVERVIEW Where to fit in the stack

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

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OVERVIEW Where to fit in the stack

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

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SL ING JOB DISTR IBUT ION

Topology

Instance Sling ID: 1

Job Manager

Instance Sling ID: 2

Job Manager

Instance Sling ID: 3

Job Manager

Instance Sling ID: 4

Job Manager

Job Consumer Topic: A

Job Consumer Topic: B

Job Consumer Topic: C

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SL ING JOB DISTR IBUT ION

Instance Sling ID: 1

Job Manager

Instance Sling ID: 2

Job Manager

Instance Sling ID: 3

Job Manager

Instance Sling ID: 4

Job Manager A

Job Consumer Topic: A

Job Consumer Topic: B

A:2

Job Consumer Topic: C Job

Topology

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SL ING JOB DISTR IBUT ION

Instance Sling ID: 1

Job Manager

Instance Sling ID: 2

Job Manager

Instance Sling ID: 3

Job Manager

Instance Sling ID: 4

Job Manager B

Job Consumer Topic: A

Job Consumer Topic: B

B:3

Job Consumer Topic: C Job

Topology

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SL ING JOB DISTR IBUT ION

Instance Sling ID: 1

Job Manager

Instance Sling ID: 2

Job Manager

Instance Sling ID: 3

Job Manager

Instance Sling ID: 4

Job Manager C

Job Consumer Topic: A

Job Consumer Topic: B

C:4

Job Consumer Topic: C Job

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Topology

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SL ING JOB DISTR IBUT ION

Instance Sling ID: 1

Job Manager

Instance Sling ID: 2

Job Manager

Instance Sling ID: 3

Job Manager

Instance Sling ID: 4

Job Manager C

Job Consumer Topic: A

Job Consumer Topic: B

C:4

Job Consumer Topic: C Job

Offloading Framework

Topology

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•  Detects offloading jobs •  Transport of job and job

payload between origin and target instance

•  Uses replication for the transport

•  No distribution of jobs •  No execution of jobs

OFFLOADING FRAMEWORK Overview

Instance Sling ID: 1

Job Manager

Offloading Job Manager

C:4

Instance Sling ID: 4

Job Manager

Job Consumer Topic: C

Offloading Job Manager

C:4

C

Job

Replication

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2

3 5

4

6 7

Topology

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•  Replication agents are created automatically •  Uses naming convention •  Needs manual adjustments (replication user)

OFFLOADING FRAMEWORK Replication

Worker Sling ID: 4

Author Sling ID: 1

offloading_4 (outgoing agent)

offloading_reverse_4 (reverse agent)

offloading_outbox (outbox agent)

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•  Additional properties required •  Offloading job input

•  Property: OffloadingJobProperties. INPUT_PAYLOAD (offloading.input.payload) •  Offloading job output

•  Property: OffloadingJobProperties. OUTPUT_PAYLOAD (offloading.output.payload)

•  Takes comma separated list of paths •  Used to build the replication package •  Job sender needs to set these properties for offloading to work!

OFFLOADING FRAMEWORK Job Payload

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•  Configures Job Consumers •  Configures the topic white/black listing properties of each instance •  What jobs to execute on what instance

•  Configures the distribution •  Configuration applies for both, clustered and non-clustered installations

OFFLOADING BROWSER UI

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OFFLOADING BROWSER UI

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OFFLOADING BROWSER UI

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OFFLOADING BROWSER UI

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OVERVIEW Where to fit in the stack

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

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•  New JobConsumer •  Class: WorkflowOffloadingJobConsumer •  Topic: com/adobe/granite/workflow/offloading •  Can launch new workflows •  Expects the workflow model on the job payload •  Expects the workflow payload on the job payload

•  For use with clustered and non-clustered installations

WORKFLOW DISTR IBUT ION

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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }

WORKFLOW DISTR IBUT ION Job Consumer (Simplified)

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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }

WORKFLOW DISTR IBUT ION Job Consumer (Simplified)

•  Define the job topic

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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }

WORKFLOW DISTR IBUT ION Job Consumer (Simplified)

•  Create service component •  Must register with topic •  Implement new JobConsumer

interface

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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }

WORKFLOW DISTR IBUT ION Job Consumer (Simplified)

•  Access job properties (payload) •  Read workflow model and

payload from job properties

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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }

WORKFLOW DISTR IBUT ION Job Consumer (Simplified)

•  Workflow specific •  Use workflow API to start

workflow for the given model and payload

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@Component @Service @Property(name = JobConsumer.PROPERTY_TOPICS, value = WorkflowOffloadingJobConsumer.TOPIC) public class WorkflowOffloadingJobConsumer implements JobConsumer { public static final String TOPIC = "com/adobe/granite/workflow/offloading"; public static final String WORKFLOW_OFFLOADING_MODEL = "offloading.workflow.model"; public static final String WORKFLOW_OFFLOADING_PAYLOAD = "offloading.workflow.payload”; public JobResult process(Job job) { // read workflow model and payload from job payload String modelPath= job.getProperty(WORKFLOW_OFFLOADING_MODEL , ""); String payloadPath= job.getProperty(WORKFLOW_OFFLOADING_PAYLOAD , ""); // get/create WorkflowSession, WorkflowModel and WorkflowData objects WorkflowSession wfSession = ..; WorkflowModel wfModel = ..; WorkflowData wfData = ..; // start the workflow wfSession.startWorkflow(wfModel, wfData, metaData); // all good return JobResutl.OK; } }

WORKFLOW DISTR IBUT ION Job Consumer (Simplified)

•  Use JobResult enumeration to report back the job status

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OVERVIEW Where to fit in the stack

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

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•  Default ingestion workflow: “DAM Update Asset” •  Load is put on the instance where the workflow is started, usually the author

•  New ingestion workflow: “DAM Update Asset Offloading” •  Needs to be manually enabled by changing the workflow launcher •  New workflow model with a single step: AssetOffloadingProcess •  Uses WorkflowExternalProcess API •  Creates a new job on topic: com/adobe/granite/workflow/offloading •  Allows distributing the default ingestion workflow •  Load is put on the instance where the job is distributed to

•  Can be used to distribute in clustered and non-clustered installations

DAM INGEST ION

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@Component @Service public class AssetOffloadingProcess implements WorkflowExternalProcess { @Reference private JobManager jobManager; private static final String TOPIC = "com/adobe/granite/workflow/offloading"; public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }

DAM INGEST ION Create Job (from workflow step)

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@Component @Service public class AssetOffloadingProcess implements WorkflowExternalProcess { @Reference private JobManager jobManager; private static final String TOPIC = "com/adobe/granite/workflow/offloading"; public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }

DAM INGEST ION Create Job (from workflow step)

•  Create service component •  Implement

WorkflowExternalProcess interface

•  Reference JobManager service

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@Component @Service public class AssetOffloadingProcess implements WorkflowExternalProcess { @Reference private JobManager jobManager; private static final String TOPIC = "com/adobe/granite/workflow/offloading"; public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }

DAM INGEST ION Create Job (from workflow step)

•  DAM and Workflow specific •  Resolve to Asset •  Read model from meta data •  Read workflow payload from

Asset path

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public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }

DAM INGEST ION Create Job (from workflow step)

•  ValueMap for job properties •  Put model and payload on job

properties •  Used by the JobConsumer

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public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }

DAM INGEST ION Create Job (from workflow step)

•  Build offloading payload properties •  Comma separated list of paths •  Put them on the job payload as

well •  Only used for non-clustered

distribution

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public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ Asset asset = ..; String workflowModel = “/etc/workflow/models/dam/update_asset/jcr:content/model”; String workflowPayload = “/content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg”; ValueMap jobProperties = new ValueMapDecorator(new HashMap<String, Object>()); jobProperties.put(WORKFLOW_OFFLOADING_MODEL, workflowModel); jobProperties.put(WORKFLOW_OFFLOADING_PAYLOAD, workflowPayload); String offloadingInput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; String offloadingOutput = “/etc/workflow/models/dam/update_asset/jcr:content/model, /content/dam/geometrixx-outdoors/articles/downhill-ski-conditioning.jpg” ; jobProperties.put(OffloadingJobProperties.INPUT_PAYLOAD.propertyName(), offloadingInput); jobProperties.put(OffloadingJobProperties.OUTPUT_PAYLOAD.propertyName(), offloadingOutput); Job offloadingJob = jobManager.addJob(TOPIC, null, jobProperties); return offloadingJob.getId(); }

DAM INGEST ION Create Job (from workflow step)

•  Create job using JobManager service

•  Use topic from job consumer •  Put job payload properties •  Return the jobId as the workflow

process id (workflow specific)

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@Component @Service public class AssetOffloadingProcess implements WorkflowExternalProcess { @Reference private JobManager jobManager; private static final String TOPIC = "com/adobe/granite/workflow/offloading"; public Serializable execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap){ …. } public boolean hasFinished(Serializable externalProcessId, ..){ // returns null, if job is finished Job offloadingJob = jobManager.getJobById((String) externalProcessId); return offloadingJob == null; } }

DAM INGEST ION Create Job (from workflow step)

•  Workflow API specific callback •  Process id = jobId, from

execute() •  Query job by jobId •  Workflow step finished when job

is finished

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•  Choose a job topic •  Create JobConsumer component and register with topic chosen •  To create a new job use new JobManager.addJob() API with the topic chosen

and the job payload •  Add offloading payload to job payload •  Bundle and deploy JobConsumer on topology instances •  Enable/Disable the new topic on the instances, using Offloading Browser

DEVELOPMENT - RECIPE

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TAKE AWAY

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

63

TAKE AWAY

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

org.apache.sling.discovery.api •  Discovers topology •  Cross-Cluster detection •  Foundation for job distribution

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Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

org.apache.sling.event •  Uses Sling Discovery •  New JobConsumer API and job topics •  New JobManager API for creating new distributed jobs •  Distributes jobs based on available job topics and job queue

configuration. •  Distributes in the whole topology, including clustered and non-

clustered instances •  Can execute cluster local jobs only

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Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

com.adobe.granite.offloading.core

•  Builds on top of Sling Distributed Jobs •  Does not perform distribution •  Detects jobs distributed to non-clustered instances •  Transports the jobs and payload to non-clustered

instances •  Uses replication for transport •  Does not execute jobs

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Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

com.adobe.granite.workflow.core

•  Defines a job consumer to distribute the execution of whole workflows

•  Defines topic com/adobe/granite/workflow/offloading

•  Implements WorkflowOffloadingJobConsumer component

•  Supports clustered and non clustered installations

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Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

cq-dam-core

•  Makes use of com/adobe/granite/workflow/offloading topic from Workflow Distribution

•  New workflow step (external step) that creates a new job on topic com/adobe/granite/workflow/offloading

•  New “DAM Update Asset Offloading” workflow •  Supports clustered and non clustered

configurations

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TAKE AWAY Potential Future

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

Felix OSGi Event Admin

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TAKE AWAY Potential Future

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

Felix OSGi Event Admin

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New OSGi Specification • Distributed Eventing • Cloud Computing

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TAKE AWAY Potential Future

Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

Felix OSGi Event Admin

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Job Distribution •  Improved load balancing • Pull based distribution

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Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

Felix OSGi Event Admin

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Offloading • As part of job distribution • Even simpler setup

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Discovery

Offloading Workflow Distribution

DAM Ingestion

Sling

Granite

AEM

Job Distribution

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