#The Problem We just described standard design issues you have when you start creating layers of services, DAOs and other components to implement an application. That blog/gist is here.
The goal is to think through some designs in order to develop something useful for an application.
#Working through Layers If you compose services and DAOs the normal way, you typically get imperative style objects. For example, imagine the following:
object DomainObjects {
| It has been 5 years now, since I got myself involved into JavaScript. Be it developing projects, guiding people or publishing articles; I feel like, JavaScript gave me an identity, scope and most importantly satisfaction. Thanks JavaScript! | |
| In the last 5 years years I worked heavily in many JavaScript frameworks, be it back or front-end. But Ember was disappeared from my life since 2015 mid. I involved my life in other tools and frameworks of JavaScript. Fortunately one month ago I got a chance to work with a client who wanted me to develop his project in Ember. I was not much excited as ember was a known guy to me, but started developing the project as it’s a day to day life for me. But after delivering the project I started thinking of my experiences with these three front-end frameworks and probably today publishing this article out of my emotions. | |
| Disclaimer | |
| This article is NOT about blaming or lashing out at Angular or React. | |
| This article is NOT about going very deep in technical aspects of these thre |
| $ docker-compose up | |
| Starting tpreregui_server_1 | |
| Starting tpreregui_ember_1 | |
| Starting tpreregui_bower_1 | |
| Starting tpreregui_npm_1 | |
| Attaching to tpreregui_ember_1, tpreregui_npm_1, tpreregui_server_1, tpreregui_b | |
| ower_1 | |
| ←[33mnpm_1 |←[0m npm info it worked if it ends with ok | |
| ←[33mnpm_1 |←[0m npm info using npm@2.14.7 | |
| ←[36member_1 |←[0m node_modules appears empty, you may need to run `npm instal |
| def getContentsByUser(userId: UUID, adopted: Boolean = false): Either[UserNotFoundError, List[Content]] = { | |
| getDatabase withDynSession { | |
| val subQuery = | |
| adopted match { | |
| case false => { | |
| for { | |
| uc <- UserContentTable.query if uc.userId === userId.toString && (!uc.adopted.isDefined || !uc.adopted) | |
| c <- ContentTable.query if uc.contentId === c.id | |
| } | |
| yield (uc, c) |
| [info] Compiling 20 Scala sources to /Users/craiger/workspace/Grind/slick-3.0/target/scala-2.10/classes... | |
| [error] | |
| [error] while compiling: /Users/craiger/workspace/Grind/slick-3.0/src/main/scala/csslick3/ChunkTable.scala | |
| [error] during phase: typer | |
| [error] library version: version 2.10.5 | |
| [error] compiler version: version 2.10.5 | |
| [error] reconstructed args: -classpath /Users/craiger/workspace/Grind/slick-3.0/target/scala-2.10/classes:/Users/craiger/.ivy2/cache/org.mockito/mockito-all/jars/mockito-all-1.9.5.jar:/Users/craiger/.ivy2/cache/mysql/mysql-connector-java/jars/mysql-connector-java-5.1.26.jar:/Users/craiger/.ivy2/cache/com.typesafe.slick/slick_2.11/bundles/slick_2.11-3.0.3.jar:/Users/craiger/.ivy2/cache/com.typesafe/config/bundles/config-1.2.1.jar:/Users/craiger/.ivy2/cache/org.reactivestreams/reactive-streams/jars/reactive-streams-1.0.0.jar:/Users/craiger/.ivy2/cache/commons-codec/commons-codec/jars/commons-codec-1.8.jar:/Users/craiger/.ivy2/cache/ch.qos.logback/logback-classic |
| Started by user anonymous | |
| Building on master in workspace E:\JW\Deposit Submission Folder\tpr-dsub-ui | |
| > E:\Program Files\Git\bin\git.exe rev-parse --is-inside-work-tree # timeout=10 | |
| Fetching changes from the remote Git repository | |
| > E:\Program Files\Git\bin\git.exe config remote.origin.url git@bitbucket.org:tprmbca/tpr-dsub-ui.git # timeout=10 | |
| Fetching upstream changes from git@bitbucket.org:tprmbca/tpr-dsub-ui.git | |
| > E:\Program Files\Git\bin\git.exe --version # timeout=10 | |
| using GIT_SSH to set credentials | |
| > E:\Program Files\Git\bin\git.exe -c core.askpass=true fetch --tags --progress git@bitbucket.org:tprmbca/tpr-dsub-ui.git +refs/heads/*:refs/remotes/origin/* | |
| > E:\Program Files\Git\bin\git.exe rev-parse "origin/dev^{commit}" # timeout=10 |
| // implicit val chunkStateType = MappedColumnType.base[ChunkState,String]( | |
| // { cs:ChunkState => cs.toString}, | |
| // { s: String => ChunkState.valueOf(s).get} | |
| // ) | |
| val query = | |
| userDistributionQuery.leftJoin(ChunkTable.query.filter { c => c.state === (ChunkState.ASSIGNED:ChunkState) } ) | |
| .on { case ((u_id, d_id), c) => c.distributionId === d_id && c.transcriberId === u_id } | |
| .map { case ((u_id, d_id), c) => c.id.? } | |
| implicit val chunkStateType = MappedColumnType.base[ChunkState,String]( | |
| { cs:ChunkState => cs.toString}, | |
| { s: String => ChunkState.valueOf(s).get} | |
| ) |
| val query = | |
| userDistributionQuery.leftJoin(ChunkTable.query.filter { c => c.state === ChunkState.ASSIGNED.toString } ) | |
| .on { case ((u_id, d_id), c) => c.distributionId === d_id && c.transcriberId === u_id } | |
| .map { case ((u_id, d_id), c) => c.id.? } |
| class ChunkTable(tag:Tag) extends Table[ChunkModel] (tag, "chunk") { | |
| //Other columns... | |
| def state = column[ChunkState]("state") |