Apache Chemistry: The Alfresco Open Source Implementation of CMIS

and
Florian Müller, Software Architect

Agenda

•  A quick CMIS tour
•  Introduction to Apache Chemistry
•  OpenCMIS demos
•  Outlook: CMIS, Apache Chemistry and Alfresco

•  Tech Talk: Alfresco CMIS
Online webinar, Wednesday, 3 August 2011

Content Management Interoperability Services
consumer

Client

read write

Services
Domain Model
provider

Vendor Mapping

CMIS lets you read, search, write, update,
Content
delete, version, control, …
Repository content and metadata!

CMIS Use Cases

Content
Client Client
Repository

Content Content Content
Content
Repository Repository Repository
Content
Repository
Repository

•  Collaborative Content Creation
•  Portals
•  Client Application Integration
•  Mashup

CMIS Base Types

Document Folder
•  Content •  Container
•  Renditions •  Hierarchy
•  Version History •  Filing

Described by
Type Definitions

Relationship Policy
•  Source Object •  Target Object
•  Target Object

Type Definitions

Object Property
•  Type Id •  Property Id
•  Parent •  Display Name
•  Display Name
* •  Type
•  Queryable •  Required
•  Controllable •  Default Value
•  …

Document Folder Relationship Policy
•  Versionable •  Source Types
•  Allow Content •  Target Types

Custom Type

Base Properties

All objects Documents
String! cmis:name  ! Boolean! cmis:isImmutable  !
ID! cmis:objectId! Boolean! cmis:isLatestVersion!
ID! cmis:baseTypeId  ! Boolean! cmis:isMajorVersion!
ID! cmis:objectTypeId   ! Boolean! cmis:isLatestMajorVersion!
String! cmis:createdBy    ! String! cmis:versionLabel!
DateTime! cmis:creationDate! ID! cmis:versionSeriesId !
String! cmis:lastModifiedBy ! Boolean! cmis:isVersionSeriesCheckedOut !
DateTime! cmis:lastModificationDate! String! cmis:versionSeriesCheckedOutBy !
String! cmis:changetoken! ID! cmis:versionSeriesCheckedOutId !
String! cmis:checkinComment!
Folders Integer! cmis:contentStreamLength!
ID! cmis:parentId! String! cmis:contentStreamMimeType !
String! cmis:path  ! String! cmis:contentStreamFileName   !
ID (multi)! cmis:allowedChildObjectTypeIds ! ID! cmis:contentStreamId  !

Relationships Policies
ID! cmis:sourceId  ! String! cmis:policyText   !
ID! cmis:targetId   !

Content Streams

Document * Rendition
•  Mime Type •  Kind
•  Length •  Mime Type

Content Stream
•  Stream Id

* Maximum length is repository specific

Access Control

ACL
Object
ACE
•  Principal
•  Permissions
•  Direct

Permissions
cmis:read
cmis:write
cmis:all
<repository specific>

Document Versioning

Document
Repository Vendor May Support
V1 •  Version Specific Folder Filing
Minor •  Query All Versions
•  Create Minor, Major, PWCs
Version Series

V2 checkout
Major

PWC

V3
checkin
Major

Policies

Repository specific Policies

Retention Security …

Client
ly
app

Document

* Note: Optional Capability

Change Log

Change Events

Repo Create Update Delete Client
logs discover

Change Event:
•  Object Id
•  Change Time
•  Change Type – created, updated, deleted, security
•  Properties – for updated events

* Note: Optional Capability

CMIS Query Language

•  SELECT and FROM clauses
o  Identify which properties from which types to return

•  WHERE clause
o  Restrict returned rows to those that meet all constraints
o  Predicates: comparison, in, like, null, any, is null
o  Function Predicates: contains(), in_folder(), in_tree()
o  Operators: and, or, not

•  ORDER BY clause
o  Order results by one or more columns

•  Each Type is projected as a Table

Do You Understand These Queries?

SELECT cmis:name
FROM cmis:document
WHERE contains('alfresco')

SELECT cmis:name, cmis:lastModificationDate
FROM cmis:document
WHERE cmis:lastModifiedBy = 'admin'
ORDER BY cmis:lastModificationDate DESC

SELECT cmis:name, cmis:contentStreamLength
FROM cmis:document
WHERE IN_TREE('<folderObjectId>')
AND cmis:contentStreamLength > 100000
ORDER BY cmis:contentStreamLength

CMIS Services

Browse Inspect Act

Repository Object Object
-  Get Server Information - Read Content - Write Content
-  Get Type Definitions - Get Properties - Set Properties
- Get ACLs - Create Folder / Doc /
- Get Allowable Actions Relation
- Delete
-  Move
-  Set ACLs
Navigation Versioning
- Walk Folder / Doc -  Walk Version History
Hierarchy
- Get Checked-out
Versioning
- Check-out / In
Relationship - Cancel Check-out
-  Traverse Relationship(s) - Delete Version(s)

Discovery
- Issue Query
- Get Change Log Policy Policy
-  Get Applied Policies - Apply / Remove

CMIS Cheat Sheet

http://cmis.alfresco.com/cmis-cheatsheet.pdf

CMIS Bindings

•  CMIS 1.0 defines two bindings:
o  AtomPub binding
o  Web Services binding

•  CMIS 1.1 will add a new binding:
o  Browser binding (JSON)

•  Don’t bother …
There are Open Source libraries for that

Apache Chemistry
TM

Open Source implementations of

•  Apache Chemistry is the umbrella project for all CMIS
related projects within the Apache Software Foundation.

•  Apache Chemistry provides libraries and frameworks for
Java, Python, PHP and .NET.

•  Website: http://chemistry.apache.org

Main Objective

Developers should focus on the CMIS domain model!

•  Decreased learning curve: Developers can learn just
the CMIS domain model and ignore the transport details
of all the binding implementations.

•  Rapid start. From download to listing the first folder in
minutes.

•  Be compliant. Chemistry libraries have been tested
against many, many repositories.

Apache Chemistry

Application

Libraries Apache Chemistry
(ORM, connection pools, etc.)

ODBC / JDBC CMIS Bindings

CMIS Domain
SQL
Model

Relational DB Content Repository

Subprojects

•  OpenCMIS (Java, server and client)
o  very mature
o  well tested against all major servers

•  cmislib (Python, client)
o  mature
o  well tested against most major servers

•  phpclient (PHP, client)
o  basic specification coverage
o  used in a few production systems

•  DotCMIS (.NET, client)
o  an OpenCMIS port (same architecture, similar API)
o  works against all tested servers but needs more testing

History

May 2009: Started as an incubator project by
Nuxeo and Day (now Adobe)

February 2010: Metaversant contributed cmislib

February 2010: Alfresco, OpenText and SAP contributed
OpenCMIS

May 2010: Alfresco contributed phpclient

January 2011: Alfresco contributed DotCMIS

February 2011: Graduated to a top level project

OpenCMIS

OpenCMIS consists of a collection of Java libraries,
frameworks and tools:

•  Client library
•  Server framework
•  Two test repositories (InMemory and FileShare)
•  CMIS Browser (web application, AtomPub only)
•  CMIS Workbench (desktop application for developers)
•  FIT and TCK

Get hold of OpenCMIS

OpenCMIS is available

•  as source code:
https://svn.apache.org/repos/asf/chemistry/opencmis/trunk/

•  as release package with all dependencies:
http://chemistry.apache.org/java/download.html

•  via Maven:
http://chemistry.apache.org/java/developing/dev-use-with-maven.html

•  Last released version is 0.4.0

OpenCMIS Client Library

•  Client API
o  OO API
You want this API!
o  Easy to use
o  Build-in caching

•  Client Binding API
o  Low-level
o  Very close to the CMIS specification
o  More control, less comfort

OpenCMIS Client Interfaces
«loads»

ObjectId

0..n
RepositoryInfo Rendition AllowableActions ACL PropertyData

0..n 0..n
0..n «loads»
ACE

Repository QueryResult CmisObject Property
target 0..n
source

«loads» «loads» FileableCmisObject
«creates»

SessionFactory «creates» Session Folder Document Policy Relationship 0..n
0..n

0..n
«loads»

ContentStream

ChangeEvents

0..n FolderType DocumentType PolicyType RelationshipType

ChangeEvent

ObjectType PropertyDefinition
9..n

1 0..n

OpenCMIS Main Client Interfaces

AllowableActions ObjectId ACL

0..n
ACE

Rendition CmisObject Property
0..n 0..n

FileableCmisObject

Folder Document Policy Relationship

ContentStream

Aspects, Aspects, Aspects

•  CMIS 1.0 has no native support for aspects

•  Secondary types (= aspects) will be in CMIS 1.1

•  Alfresco provides read and write access to aspects and
aspect properties through CMIS extensions

•  Theoretically, every CMIS client can read and write
aspects but that is rather troublesome

Alfresco OpenCMIS Extension

•  The Alfresco OpenCMIS Extension transparently adds
aspect support to OpenCMIS

•  Hosted on Apache Extras (Google Code),
Apache license:
http://apache-extras.org/p/alfresco-opencmis-extension

•  See the project page for setup instructions.
It’s really simple.

OpenCMIS Sessions

•  CMIS is stateless!

•  OpenCMIS introduces a session concept to support caching
o  It’s all about performance
o  Reduce the number of calls to the repository

•  OpenCMIS caches:
o  Repository infos
o  Type definitions
o  AtomPub links
o  CMIS objects

Connect to a repository – Variant 1

// set up session parameters
Map<String, String> parameter = new HashMap<String, String>();

parameter.put(SessionParameter.BINDING_TYPE, BindingType.ATOMPUB.value());
parameter.put(SessionParameter.ATOMPUB_URL,
"http://cmis.alfresco.com/service/cmis");
parameter.put(SessionParameter.REPOSITORY_ID,
"84ccfe80-b325-4d79-ab4d-080a4bdd045b");

parameter.put(SessionParameter.USER, "admin");
parameter.put(SessionParameter.PASSWORD, "admin");

// create the session
SessionFactory factory = SessionFactoryImpl.newInstance();
Session session = factory.createSession(parameter);

Connect to a repository – Variant 2

// set up session parameters
Map<String, String> parameter = new HashMap<String, String>();

parameter.put(SessionParameter.BINDING_TYPE, BindingType.ATOMPUB.value());
parameter.put(SessionParameter.ATOMPUB_URL,
"http://cmis.alfresco.com/service/cmis");
parameter.put(SessionParameter.REPOSITORY_ID,
"84ccfe80-b325-4d79-ab4d-080a4bdd045b");

parameter.put(SessionParameter.USER, "admin");
parameter.put(SessionParameter.PASSWORD, "admin");

// get the list of repositories and choose the first one
SessionFactory factory = SessionFactoryImpl.newInstance();

List<Repository> repositories = factory.getRepositories(parameter);
Session session = repositories.get(0).createSession();

Using the Session

RepositoryInfo ri = session.getRepositoryInfo();
String id = ri.getId();
String name = ri.getName();

CmisObject object1 = session.getObject("1234567890");!
CmisObject object2 = session.getObjectByPath("/my/path/doc");!

Folder rootFolder = session.getRootFolder();!
String rootFolderId = rootFolder.getId();!
!
for(CmisObject object: rootFolder.getChildren()) {!
String name = object.getName();!

if(object instanceof Document) {!
Document doc = (Document) object;!
long size = doc.getContentStreamLength(); !
}!
}!

CMIS Workbench

Live samples with the CMIS Workbench
…

Navigation

import org.apache.chemistry.opencmis.commons.*;
import org.apache.chemistry.opencmis.commons.data.*;
import org.apache.chemistry.opencmis.commons.enums.*;
import org.apache.chemistry.opencmis.client.api.*;

// get root folder
Folder root = session.getRootFolder();
String rootFolderName = root.getName();

println "Root folder: ${rootFolderName}n"

// print root folder children
for(CmisObject object: root.getChildren()) {

String name = object.getName();
String typeId = object.getType().getId();
String path = object.getPaths().get(0);

println "${name} t${typeId} t(${path})"

// get parents
/*
for(CmisObject parent: object.getParents()) {
String parentName = parent.getName();
println " Parent: ${parentName}"
}
*/
}

Paging

import org.apache.chemistry.opencmis.commons.*;!
import org.apache.chemistry.opencmis.commons.data.*;!
import org.apache.chemistry.opencmis.commons.enums.*;!
import org.apache.chemistry.opencmis.client.api.*;!
!
Folder root = session.getRootFolder();!
!
printList( root.getChildren() )!
!
//printList( root.getChildren().getPage(3) )!
!
//printList( root.getChildren().skipTo(2) )!
!
//printList( root.getChildren().skipTo(2).getPage(3) )!
!
!
!
void printList(ItemIterable<CmisObject> list) {!
list.each { println "${it.name} t${it.type.id}" }!
!
long numItems = list.getTotalNumItems();!
boolean hasMore = list.getHasMoreItems();!
!
println "--------------------------------------"!
println "Total number: ${numItems}"!
println "Has more: ${hasMore}" !
println "--------------------------------------"!
}!

Properties


CmisObject object = session.getObjectByPath("/User Homes/florian/Test Folder/MyText");

for(Property<?> property: object.getProperties()) {

String propId = property.getId();
String displayName = property.getDefinition().getDisplayName();
String queryName = property.getDefinition().getQueryName();
PropertyType datatype = property.getType();
Object value = property.getFirstValue();

println "${displayName}: ${value}"
println " Data type: ${datatype}"
println " Id: ${propId}"
println " Query name: ${queryName}"
println ""
}

Content

!
CmisObject object = session.getObjectByPath("/User Homes/florian/Test Folder/MyText");!
!
if(!(object instanceof Document)) {!
throw new Exception("Not a document!");!
}!
!
Document doc = (Document) object;!
!
ContentStream content = doc.getContentStream();!
!
if(content == null) {!
throw new Exception("Document has no content!");!
}!
!
String filename = content.getFileName();!
String mimeType = content.getMimeType();!
long length = content.getLength();!
InputStream stream = content.getStream();!
!
println "File: ${filename}"!
println "MIME Type: ${mimeType}"!
println "Size: ${length} bytes"!
println "Has stream: " + (stream != null)!
!

Query

import org.apache.chemistry.opencmis.commons.*
import org.apache.chemistry.opencmis.commons.data.*
import org.apache.chemistry.opencmis.commons.enums.*
import org.apache.chemistry.opencmis.client.api.*

String cql = "SELECT cmis:objectId, cmis:name, cmis:contentStreamLength FROM cmis:document";

ItemIterable<QueryResult> results = session.query(cql, false);

//ItemIterable<QueryResult> results = session.query(cql, false).getPage(10);
//ItemIterable<QueryResult> results = session.query(cql, false).skipTo(10).getPage(10);

for(QueryResult hit: results) {
for(PropertyData<?> property: hit.getProperties()) {

String queryName = property.getQueryName();
Object value = property.getFirstValue();

println "${queryName}: ${value}"
}

println "--------------------------------------"
}

Folders

!
Folder root = session.getRootFolder();!
!
// create a new folder!
Map<String, Object> properties = new HashMap<String, Object>();!
properties.put("cmis:objectTypeId", "cmis:folder");!
properties.put("cmis:name", "a new folder");!
!
Folder newFolder = root.createFolder(properties);!
!
printProperties(newFolder);!
!
!
// update properties!
Map<String, Object> updateproperties = new HashMap<String, Object>();!
updateproperties.put("cmis:name", "renamed folder");!
!
newFolder.updateProperties(updateproperties);!
!
newFolder.refresh();!
printProperties(newFolder);!
!
!
// delete folder!
newFolder.deleteTree(true, UnfileObject.DELETE, true);!
!

Documents

import org.apache.chemistry.opencmis.commons.impl.dataobjects.*;

Folder root = session.getRootFolder();

// create a new document
String name = "myNewDocument.txt";

Map<String, Object> properties = new HashMap<String, Object>();
properties.put("cmis:objectTypeId", "cmis:document");
properties.put("cmis:name", name);

byte[] content = "Hello World!".getBytes();
InputStream stream = new ByteArrayInputStream(content);
ContentStream contentStream = new ContentStreamImpl(name, content.length, "text/plain", stream);

Document newDoc = root.createDocument(properties, contentStream, VersioningState.MAJOR);

printProperties(newDoc);

// delete document
newDoc.delete(true);

void printProperties(CmisObject object) {
object.properties.each { println "${it.id}: ${it.firstValue}" }
println "--------------------------------------"
}

CMIS Outlook

•  The CMIS TC is working on CMIS 1.1

•  CMIS 1.1 adds new features
o  Type mutability
o  Browser Binding
o  Secondary Types
o  …

•  Release date: 2012???

•  Will it be backwards compatible?
o  We don’t know yet.
o  Apache Chemistry will hide binding changes.

Apache Chemistry Outlook

•  Tests and documentation…
o  Make sure it works with as many CMIS servers and
clients as possible
o  Make the usage of Apache Chemistry as simple as possible

•  Apache Chemistry sandboxes
o  Implementations of CMIS 1.1 features
o  Feedback for the CMIS TC

Alfresco CMIS Outlook

•  Alfresco 4.x
o  Switch to the OpenCMIS server framework
o  Many improvements: speed, memory consumption, compliance
o  OpenCMIS client libraries are embedded and available in Web Scripts
o  Have a look: http://cmis.alfresco.com

•  Tech Talk: Alfresco CMIS
Online webinar, Wednesday, 3 August 2011
o  Alfresco CMIS mapping
o  CMIS changes in Alfresco 4.x
o  CMIS 1.1 browser binding (JSON)
o  Performance optimization
o  Whatever you want to talk about…

Apache Chemistry: The Alfresco Open Source Implementation of CMIS

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