Gaej For Beginners

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    Gaej For Beginners - Presentation Transcript

    1. Google App Engine for Java Java shin1ogawa@
    2. • Platform • • • • • Datastore • • •
    3. Platform
    4. Platform • • Disk • • AppEngine • Google Apps Apps
    5. Platform • Google • Google •
    6. Platform • • JVM … • Platform • • • AppEngine
    7. Platform • WebContainer • static FrontEnd • • DatastoreService • MailService • URLFetchService • ImageService...
    8. Platform • / , CPU , DISK , API , ...
    9. Platform “ ” • 1 1 • ”release” ”snapshot” … • http://myappid.appspot.com/ ... • http://snapthot.latest.myappid.appspot.com/ ... • • datastore • python java
    10. Platform Web • JVM JDK1.6 Hotspot Client VM • Jetty • Jetty JEE App Engine • Jetty Comet (30 stream ) • = JVM • static
    11. Platform • • Disk • • API • Java : http://code.google.com/intl/ja/appengine/docs/quotas.html
    12. Platform Java • • Thread • Socket • JDK class • white-list class -> http:// code.google.com/intl/ja/appengine/docs/java/jrewhitelist.html • GC • ...
    13. 1 • : Google • • Best practices for writing scalable applications • • Google Group • Google App Engine for Java • Google App Engine • Google-App-Engine-Japan • Google Code • googleappengine • Google I/O
    14. 2 • Google App Engine Blog • AppEngine Cookbook • appengine java night ( ?) • • tips • • • shin1ogawa • 1, 3 IRC Office Hour • irc://irc.freenode.net/#appengine • Google Calendar: delevepoer-calendar@google.com
    15. 3 • http://tech.topgate.co.jp/ : AppEngineSDK Hackathon Googler
    16. • Google Plugins for Eclipse(SDK ) • Eclipse • AppEngine ! ( ) • Ant(SDK ) • dev_appserver • app_cfg AppEngine • Python SDK(JavaSDK ) • index vacuum(Index Error ) • bulkloader(Datastore Export/Import) • NetBeans IntelliJ IDEA plugin …
    17. • • SDK local_db.bin( ) SDK • local_db.bin AppID local_db.bin k • Maven • mvnsearch appengine • shin1ogawa Maven SDK plugin
    18. • • java.util.logging • war/WEB-INF/appengine-web.xml logging.properties • ...shin1ogawa
    19. appengine • war/WEB-INF/ • appengine-web.xml ...appengine • datastore-indexes.xml ... index • cron.xml ...cron • queue.xml ...taskqueue • appegnine-generated/ • datastore-indexes-auto.xml ... index • local_db.bin ...Datastore
    20. appengine-web.xml • on/off • https on/off ...1.2.6 on • static • • logging.properties • web.xml
    21. Datastore
    22. Datastore • Kind...RDB • Entity...RDB • Property...RDB • Index...RDB • Key...Entity • Filter...SQL Where • equality filter... ”=” Filter • inequality filter...”>”, “>=”, “<=”, “<“ • Entity Group... Entity
    23. Datastore • BigTable • ... • RDB • ( = key ) • [0]id=1, name=”Hoge” • [1]id=2, height=170.5, weight=65.5 • [2]id=3, tag=[“Apple”, “Java”] •
    24. Datastore • • Entity 80ms/1 • RDB Index • Entity • • Query ( ) •
    25. Datastore • • Entity 80ms/1 • RDB Index • Entity • • Query ( ) •
    26. Datastore Entity Group • Entity • RDB Relation • Java • ) • Kind:Entity:id=1 • Kind:Entity:id=2 • Kind:Entity:id=3 • Kind:Entity:id=4 • Kind:Entity:id=5
    27. Datastore Key • Entity Property • Long (id) String (name) Key Id • EntityGroup Entity Key Entity • Entity: Kind=Parent, id=1 • Entity: Kind=Child, name=“hoge@fuga.com” • Entity Key • Parent(1)/Child(“hoge@fuga.com”)
    28. Datastore Property • Entity • java.lang • String 500 • Text • 500 String • Blob • • List Property •
    29. Datastore Index • Property • Kind Index • Kind Key Index • Single Property Index • Property Index • Composite Index • Property Index • Text Blob Index (index explosion) Composite Property Index
    30. Datastore Transaction • ACID • • JDO • • Transaction EntityGroup Entity •
    31. Datastore Query • ’<‘, ‘<=’, ‘==’, ‘>=’, ‘>’ • Like (startsWith()) • And • Java ‘IN’, ‘!=’ • Property inequality filter Property • max() min() • Join
    32. Datastore Query • Index ! Index • Kind Index, Single Property Index Datastore • Composite Index datastore-indexes.xml
    33. Datastore NG • • ID • 1,2,3,1001,1002... • • 1000 • JDO 1000 Google tips ” ”
    34. Datastore • • • • Kind • EntityGroup ( Transaction ) • Transaction •
    35. Datastore • JDO, JPA, Low-level API 3 • JPA • JDO ORM • Datastore • Low-level API • JDO Low-level API • JDO Low-level API JEE ... Low-level API
    36. Datastore JDO/Entity @PersistenceCapable(identityType = IdentityType.APPLICATION) public class Entity { @Persistent @PrimaryKey(valueStrategy = IdGeneratorStrategy.IDENTITY) Key id; @Persistent String value; @Persistent(defaultFetchGroup = “true”) Text text; @Persistent(defaultFetchGroup = “true”) List<Child> children; @Persistent Key otherEntity; } Fetch Fetch Entity List Owned Entity Unowned
    37. Datastore JDO/ PersistentManager pm = ... // PersistentManager ; Parent parent = new Parent(); parent.set...... List<Child> children = new ArrayList<Child>(); children.add(child1); parent.setChildren(children); try { Transaction transaction = pm.currentTransaction(); transaction.begin(); pm.makePersistent(parent); transaction.commit(); } finally { if (transaction.isActive()) transaction.rollback(); }
    38. Datastore JDO/ PersistentManager pm = ... // PersistentManager ; Query query = pm.newQuery(Entity.class); query.setFilter(“name == param”); query.declareParameters(“java.lang.String param”); query.setOrdering(“name asc, key desc”); @SuppressWarnings("unchecked") List<Entity> list = (List<Entity>) query.execute(“hoge”); ... Key key = KeyFactory.createKey(“Entity”, “keyName”); Entity entity = pm.getObjectById(Entity.class, key); Key key = entity.getOtherEntityKey(); OtherEntity otherEntity = pm.getObjectById(OtherEntity.class, key);
    39. Datastore JDO/ • • transient, hollow, persistent/detached • JDOHelper#getObjectState() • PersistenceManager InstanceLifecycleListener • PersistenceManager#execute() List serialize • PersistenceManager#retrieve[All]() Property fetch
    40. Datastore Low-level API/ Entity entity = new Entity(“Kind”); // Low-level API Entity entity.setProperty(“name”, “hoge”); entity.setProperty(“height”, 170.5); DatastoreService service = DatastoreServiceFactory.getDatastoreService(); service.put(entity); Entity[] entities = .... service.put(entities); Entity
    41. Datastore Low-level API/ Query query = new Query(“Entity”); query .addFilter(“name”, FilterOperator.GREATER_THAN_OR_EQUAL, “hoge”) .addSort("name", SortDirection.ASCENDING) .addSort("__key__", SortDirection.ASCENDING); DatastoreService service = DatastoreServiceFactory.getDatastoreService(); List<Entity> entities = service.prepare(query).asList( FetchOptions.Builder.withOffset(0)); Key key = KeyFactory.createKey(“Entity”, “keyName”); Entity entity = service.get(key); property ”__key__”
    42. MemcacheService • • ( ) • • cache • JCache(javax.cache), Low-level API 2 MemcacheService service = MemcacheServiceFactory.getMemcacheService(); service.put("key", list); Object cachedObject = service.get("key"); service.delete("key");
    43. cron • • URL Servlet • • cron.xml <?xml version="1.0" encoding="UTF-8"?> <cronentries> <cron> <url>/cron/fetch?name=jiemamy-sf</url> <description>fetch the jiemamy SF.jp timeline.</description> <schedule>every 1 minutes</schedule> </cron> </cronentries>
    44. TaskQueue • (task) • URL Servlet • queue.xml <?xml version="1.0" encoding="UTF-8"?> <queue-entries> <queue> <name>default</name> <rate>1/s</rate> <bucket-size>3</bucket-size> </queue> </queue-entries>
    45. • MailService • ( Servlet ) • XMPPService • ( Servlet ) • URLFetchService • ImageService • UserService • Google Account • Google appengine-java ML
    46. UI • UI … … • Google App Engine ” ” ” ”
    47. shin1ogawa@
    SlideShare Zeitgeist 2009

    + Shinichi OgawaShinichi Ogawa Nominate

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    1時間コースの入門編の資料です。

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