Evernote 同步机制分析

SyncService

SyncNotification

SyncProgressFragment

参考http://www.evernote.com/about/developer/api/evernote-api.htm#_Toc297053055

1、EDAM（Evernote Data Access and Management） 协议

• 数据模型（data model）由 service 管理
• 远程处理（remote procedures）从 service 返回和提交修改数据
• 通过 Thrift service 定义语言来描述数据模型和远程处理，支持所有流行语言

2、远程处理（remote procedures）

• UserStore service 用户认证
• NoteStore service 用于数据变更

3、数据模型

每个核心的 NoteStore 数据元都有一个GUID（Globally unique identifier），在创建时生成，不能修改，被API参考调用。

每个数据对象都有一个 USN（updateSequenceNumber），用于发生修改服务的时候。每次发生变更提交时会创建一个USN。USN 是用户名下唯一且单调递增变量，方便客户端判断同步。

• User - 用户账户，用户名密码邮箱、个人属性、偏好
• Accounting - 账务，服务级别：如上传次数/空间限制（uploadLimit）。
• Notebook - 笔记本，每个用户账户可以有多个 notebook，note 需要存放在 notebook 中。有默认的 notebook - 不能删除最后一个 notebook。
• Note - 超文本文档，ENML(Evernote Markup Language)格式，内嵌资源(images, ink, audio, PDF, etc.)，图片以内嵌二进制文件
• NoteAttributes - 系统定义的属性，如creation time, size, origin，用于搜索和过滤;
• Resource -  资源文件，二进制数据块。类似于电子邮件的附件，每个资源可能有一组描述其定义的属性 ResourceAttributes.
• SavedSearch -  保存搜索条件

资源内部使用MD5关联资源，如

<en-media type=”image/jpeg” hash=”9e107d9d372bb6826bd81d3542a419d6”/>

4、UserStore Service

固定访问： https://www.evernote.com/edam/user

UserStore Service API

远程方法	简介
checkVersion	发送客户端版本号给服务，并获取兼容响应。
authenticate	发送用户名和密码给服务，并获取成功的令牌信息。
refreshAuthentication	发送一个将要到期的令牌给服务，并获取一个新的令牌。
getUser	根据令牌返回一个用户。
getPublicUserInfo	返回一个用户的公开信息。
getPreminmInfo	返回一个用户免费/高级账号状态。

5、OAuth 认证

6、NoteStore Service

固定访问： https://www.evernote.com/edam/note/

远程方法	简介
listNotebooks	Returns a list of all of the Notebooks in the account.
getNotebook	Retrieves the state of a single Notebook.
getDefaultNotebook	Retrieves the Notebook that should receive new Notes which do not specify a destination.
createNotebook	Makes a new Notebook in the account.
updateNotebook	Changes an existing Notebook.
expungeNotebook	Permanently removes an existing Notebook. Notes within the notebook are moved to the current default Notebook and moved into the trash.
listTags	Returns a list of all of the Tags in the account.
listTagsByNotebook	Returns a list of all of the Tags that are applied to at least one note within a specified notebook.
getTag	Retrieves the state of a single Tag.
createTag	Makes a new Tag in the account.
updateTag	Changes an existing Tag.
untagAll	Removes a Tag from any Notes.
expungeTag	Permanently removes an existing Tag.
listSearches	Returns a list of all of the SavedSearches in the account.
getSearch	Retrieves the state of a single SavedSearch.
createSearch	Makes a new SavedSearch in the account.
updateSearch	Changes an existing SavedSearch.
expungeSearch	Permanently removes an existing SavedSearch.
findNotes	Performs a search of the Notes in the User’s account based on a configurable filter, returning a paginated subset.
findNotesMetadata	Performs a search of the Notes in the User’s account based on a configurable filter, returning a paginated, configurable subset of metadata for matching notes.
findNoteCounts	Performs a search based on a configurable filter, returning the number of Notes that would match this filter for each Notebook and Tag.
getNote	Retrieves the state of a single Note.
getNoteContent	Retrieves just the ENML hypertext content of a Note.
getNoteSearchText	Returns the plain text contents of a single note.
getNoteTagNames	Retrieves the names of the Tags for a single Note.
createNote	Makes a new Note in an existing Notebook.
updateNote	Changes the content or metadata of a single existing Note.
deleteNote	Moves a single existing Note to the trash.
expungeNote	Permanently removes an existing Note. In most cases, third party applications that wish to remove a Note should use deleteNote instead of expungeNote.
expungeNotes	Permanently removes a set of existing Notes.
expungeInactiveNotes	Permanently removes all of the notes that are currently not active (i.e. notes in the “Trash”)
copyNote
listNoteVersions	Retrieves a list of the prior versions of a particular note that are saved within the service.
getNoteVersion	Retrieves a previous version of a Note after it has been updated within the service (for premium Users only).
getNoteApplicationData	Retrieves the full applicationData map for a given note.
getNoteApplicationDataEntry	Retrieves a single entry in the applicationData map for a given note.
setNoteApplicationDataEntry	Create or update a single entry in the applicationData map for a given note.
unsetNoteApplicationDataEntry	Remove a single entry from the applicationData map for a given note.
getResource	Retrieves the state of a single Note attachment, optionally with its binary contents.
updateResource	Updates the metadata for a single Resource.  (Not its binary contents.)
getResourceData	Retrieves the binary contents of a single Resource.
getResourceByHash	Retrieves one of the resources from a Note, via the MD5 checksum of its contents, not its GUID.
getResourceRecognition	Returns the XML recognition index file for a single Resource, which can be used to find words in the image.
getResourceAlternateData	Retrieves the binary contents of the Resource’s alternate data file.
getResourceAttributes	Returns the set of attributes for the Resource.
getResourceSearchText	Returns the plain text contents of a single Resource.
getResourceApplicationData	Retrieves the full applicationData map for a given resource.
getResourceApplicationDataEntry	Retrieves a single entry in the applicationData map for a given resource.
setResourceApplicationDataEntry	Create or update a single entry in the applicationData map for a given resource.
unsetResourceApplicationDataEntry	Remove a single entry from the applicationData map for a given resource.
getPublicNotebook	Gets the information for one published Notebook from a user’s account, via its public URI.
createSharedNotebook	Make a new SharedNotebook object.
listSharedNotebooks	Returns a list of all of the SharedNotebooks in an account.
expungeSharedNotebooks	Permanently removes a set of existing SharedNotebooks.
createLinkedNotebook	Makes a new LinkedNotebook object.
updateLinkedNotebook	Changes an existing LinkedNotebook.
listLinkedNotebooks	Returns a list of all LinkedNotebooks in an account.
expungeLinkedNotebook	Permanently removes an existing LinkedNotebook.
authenticateToSharedNotebook	Returns an authentication token that can be used to access the contents of a notebook shared from someone else’s account.
getSharedNotebookByAuth	Get extended information about a notebook shared from someone else’s account.
sendMessageToSharedNotebookMembers	Send an email to some or all of the addresses that a notebook has already been shared with. The message will include a link to the shared notebook.
getSyncState	Light-weight call for caching clients to “ping” the service to see whether the account has changed.
getSyncChunk	Core routine for full, synchronizing clients to retrieve the set of changes in an account since the last checkpoint. If you are developing a new application consider using getFilteredSyncChunkinstead of getSyncChunk.
getFilteredSyncChunk	Similar to getSyncChunk, but allows clients to specify the set of data elements that they would like returned to reduce network traffic and sync time.
getLinkedNotebookSyncState	Light-weight call for caching clients to “ping” the service to see whether shared notebooks linked from other accounts have changed.
getLinkedNotebookSyncChunk	Core routine for full, synchronizing clients to retrieve the set of changes in shared notebooks linked from other accounts since the last checkpoint.