add realization of PostsAPI in Exposed
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@ -29,9 +29,9 @@ interface ReadPostsAPI {
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suspend fun getPostsByContent(id: ContentId): List<RegisteredPost>
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/**
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* @return all [RegisteredPost]s between [from] and [to]. Range will be used INCLUSIVE, line \[[from], [to]\]
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* @return all [RegisteredPost]s which was registered between [from] and [to]. Range will be used INCLUSIVE, line \[[from], [to]\]
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*/
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suspend fun getPostsByDates(from: DateTime = MIN_DATE, to: DateTime = MAX_DATE): List<RegisteredPost>
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suspend fun getPostsByCreatingDates(from: DateTime = MIN_DATE, to: DateTime = MAX_DATE): List<RegisteredPost>
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/**
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* @return all posts by pages basing on their creation date
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@ -39,10 +39,10 @@ interface ReadPostsAPI {
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suspend fun getPostsByPagination(pagination: Pagination): PaginationResult<out RegisteredPost>
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}
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suspend fun ReadPostsAPI.getPostsByDates(
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suspend fun ReadPostsAPI.getPostsByCreatingDates(
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from: DateTime? = null,
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to: DateTime? = null
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) = getPostsByDates(
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) = getPostsByCreatingDates(
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from ?: MIN_DATE,
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to ?: MAX_DATE
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)
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@ -68,7 +68,7 @@ class InMemoryPostsAPI(
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override suspend fun getPostsByContent(id: ContentId): List<RegisteredPost> =
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posts.values.filter { post -> id in post.content }
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override suspend fun getPostsByDates(from: DateTime, to: DateTime): List<RegisteredPost> =
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override suspend fun getPostsByCreatingDates(from: DateTime, to: DateTime): List<RegisteredPost> =
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(from .. to).let { range ->
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posts.values.filter {
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it.creationDate in range
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@ -18,7 +18,7 @@ private class ContentAPIDatabaseTable(
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internal val idColumn = text("_id")
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internal val dataColumn = text("data")
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private inline fun <T> transaction(noinline body: Transaction.() -> T): T = transaction(database, body)
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private inline fun <T> transaction(noinline body: Transaction.() -> T): T = database.transaction(body)
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init {
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transaction {
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@ -84,5 +84,5 @@ private class ContentAPIDatabaseTable(
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}
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class ExposedContentAPI (
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private val database: Database
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database: Database
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) : ContentAPI by ContentAPIDatabaseTable(database)
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@ -0,0 +1,177 @@
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package com.insanusmokrassar.postssystem.core.exposed
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import com.insanusmokrassar.postssystem.core.content.ContentId
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import com.insanusmokrassar.postssystem.core.post.*
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import com.insanusmokrassar.postssystem.core.post.api.PostsAPI
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import com.insanusmokrassar.postssystem.core.utils.generatePostId
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import com.insanusmokrassar.postssystem.core.utils.pagination.*
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import com.soywiz.klock.DateTime
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import kotlinx.coroutines.channels.BroadcastChannel
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import kotlinx.coroutines.channels.Channel
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.asFlow
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import org.jetbrains.exposed.sql.*
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private class PostsAPIContentRelations(
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private val database: Database
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) : Table() {
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private val postIdColumn = text("postId")
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private val contentIdColumn = text("contentId")
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private inline fun <T> transaction(noinline body: Transaction.() -> T): T = database.transaction(body)
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init {
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transaction {
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SchemaUtils.createMissingTablesAndColumns(this@PostsAPIContentRelations)
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}
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}
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fun getPostContents(postId: PostId): List<ContentId> {
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return transaction {
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select { postIdColumn.eq(postId) }.map { it[contentIdColumn] }
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}
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}
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fun getContentPosts(contentId: ContentId): List<PostId> {
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return transaction {
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select { contentIdColumn.eq(contentId) }.map { it[postIdColumn] }
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}
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}
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fun linkPostAndContents(postId: PostId, vararg contentIds: ContentId) {
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transaction {
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val leftToPut = contentIds.toSet() - getPostContents(postId)
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leftToPut.forEach { contentId ->
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insert {
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it[postIdColumn] = postId
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it[contentIdColumn] = contentId
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}
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}
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}
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}
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fun unlinkPostAndContents(postId: PostId, vararg contentIds: ContentId): Boolean {
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return transaction {
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deleteWhere {
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postIdColumn.eq(postId).and(contentIdColumn.inList(contentIds.toList()))
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} > 0
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}
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}
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}
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private class PostsAPIDatabaseTable(
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private val database: Database
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) : PostsAPI, Table() {
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private val contentsTable = PostsAPIContentRelations(database)
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private val idColumn = text("postId")
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private val creationDateColumn = datetime("creationDate").default(org.joda.time.DateTime.now())
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private val modificationDateColumn = datetime("modificationDate").default(org.joda.time.DateTime.now())
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private val postCreatedBroadcastChannel = BroadcastChannel<RegisteredPost>(Channel.BUFFERED)
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override val postCreatedFlow: Flow<RegisteredPost> = postCreatedBroadcastChannel.asFlow()
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private val postDeletedBroadcastChannel = BroadcastChannel<RegisteredPost>(Channel.BUFFERED)
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override val postDeletedFlow: Flow<RegisteredPost> = postDeletedBroadcastChannel.asFlow()
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private val postUpdatedBroadcastChannel = BroadcastChannel<RegisteredPost>(Channel.BUFFERED)
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override val postUpdatedFlow: Flow<RegisteredPost> = postUpdatedBroadcastChannel.asFlow()
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private inline fun <T> transaction(noinline body: Transaction.() -> T): T = database.transaction(body)
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init {
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transaction {
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SchemaUtils.createMissingTablesAndColumns(this@PostsAPIDatabaseTable)
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}
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}
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private fun ResultRow.toRegisteredPost(): RegisteredPost = get(idColumn).let { id ->
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SimpleRegisteredPost(
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id,
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contentsTable.getPostContents(id),
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DateTime(get(creationDateColumn).millis),
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DateTime(get(modificationDateColumn).millis)
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)
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}
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override suspend fun createPost(post: Post): RegisteredPost? {
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val id = generatePostId()
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return transaction {
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insert {
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it[idColumn] = id
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}
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contentsTable.linkPostAndContents(id, *post.content.toTypedArray())
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select { idColumn.eq(id) }.firstOrNull() ?.toRegisteredPost()
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} ?.also {
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postCreatedBroadcastChannel.send(it)
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}
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}
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override suspend fun deletePost(id: PostId): Boolean {
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val post = getPostById(id) ?: return false
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return (transaction {
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deleteWhere { idColumn.eq(id) }
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} > 0).also {
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if (it) {
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postDeletedBroadcastChannel.send(post)
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contentsTable.unlinkPostAndContents(id, *post.content.toTypedArray())
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}
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}
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}
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override suspend fun updatePostContent(postId: PostId, post: Post): Boolean {
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return transaction {
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val alreadyLinked = contentsTable.getPostContents(postId)
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val toRemove = alreadyLinked - post.content
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val toInsert = post.content - alreadyLinked
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val updated = (toRemove.isNotEmpty() && contentsTable.unlinkPostAndContents(postId, *toRemove.toTypedArray())) || toInsert.isNotEmpty()
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if (toInsert.isNotEmpty()) {
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contentsTable.linkPostAndContents(postId, *toInsert.toTypedArray())
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}
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updated
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}.also {
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if (it) {
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getPostById(postId) ?.also { updatedPost -> postUpdatedBroadcastChannel.send(updatedPost) }
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}
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}
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}
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override suspend fun getPostsIds(): Set<PostId> {
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return transaction {
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selectAll().map { it[idColumn] }.toSet()
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}
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}
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override suspend fun getPostById(id: PostId): RegisteredPost? {
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return transaction {
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select { idColumn.eq(id) }.firstOrNull() ?.toRegisteredPost()
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}
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}
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override suspend fun getPostsByContent(id: ContentId): List<RegisteredPost> {
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return transaction {
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val postsIds = contentsTable.getContentPosts(id)
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select { idColumn.inList(postsIds) }.map { it.toRegisteredPost() }
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}
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}
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override suspend fun getPostsByCreatingDates(from: DateTime, to: DateTime): List<RegisteredPost> {
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return transaction {
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select { creationDateColumn.between(from, to) }.map { it.toRegisteredPost() }
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}
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}
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override suspend fun getPostsByPagination(pagination: Pagination): PaginationResult<out RegisteredPost> {
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return transaction {
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val posts = selectAll().limit(pagination.size, pagination.firstIndex).orderBy(creationDateColumn).map {
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it.toRegisteredPost()
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}
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val postsNumber = selectAll().count()
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pagination.createResult(postsNumber, posts)
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}
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}
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}
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class ExposedPostsAPI (
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database: Database
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) : PostsAPI by PostsAPIDatabaseTable(database)
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@ -0,0 +1,6 @@
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package com.insanusmokrassar.postssystem.core.exposed
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import org.jetbrains.exposed.sql.Database
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import org.jetbrains.exposed.sql.Transaction
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inline fun <T> Database.transaction(noinline body: Transaction.() -> T): T = org.jetbrains.exposed.sql.transactions.transaction(this, body)
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