You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
98 lines
3.6 KiB
98 lines
3.6 KiB
/*
|
|
* Copyright (C) 2017 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package com.keylesspalace.tusky.components.conversation
|
|
|
|
import androidx.annotation.MainThread
|
|
import androidx.paging.PagedList
|
|
import com.keylesspalace.tusky.entity.Conversation
|
|
import com.keylesspalace.tusky.network.MastodonApi
|
|
import com.keylesspalace.tusky.util.PagingRequestHelper
|
|
import com.keylesspalace.tusky.util.createStatusLiveData
|
|
import retrofit2.Call
|
|
import retrofit2.Callback
|
|
import retrofit2.Response
|
|
import java.util.concurrent.Executor
|
|
|
|
/**
|
|
* This boundary callback gets notified when user reaches to the edges of the list such that the
|
|
* database cannot provide any more data.
|
|
* <p>
|
|
* The boundary callback might be called multiple times for the same direction so it does its own
|
|
* rate limiting using the PagingRequestHelper class.
|
|
*/
|
|
class ConversationsBoundaryCallback(
|
|
private val accountId: Long,
|
|
private val mastodonApi: MastodonApi,
|
|
private val handleResponse: (Long, List<Conversation>?) -> Unit,
|
|
private val ioExecutor: Executor,
|
|
private val networkPageSize: Int)
|
|
: PagedList.BoundaryCallback<ConversationEntity>() {
|
|
|
|
val helper = PagingRequestHelper(ioExecutor)
|
|
val networkState = helper.createStatusLiveData()
|
|
|
|
/**
|
|
* Database returned 0 items. We should query the backend for more items.
|
|
*/
|
|
@MainThread
|
|
override fun onZeroItemsLoaded() {
|
|
helper.runIfNotRunning(PagingRequestHelper.RequestType.INITIAL) {
|
|
mastodonApi.getConversations(null, networkPageSize)
|
|
.enqueue(createWebserviceCallback(it))
|
|
}
|
|
}
|
|
|
|
/**
|
|
* User reached to the end of the list.
|
|
*/
|
|
@MainThread
|
|
override fun onItemAtEndLoaded(itemAtEnd: ConversationEntity) {
|
|
helper.runIfNotRunning(PagingRequestHelper.RequestType.AFTER) {
|
|
mastodonApi.getConversations(itemAtEnd.lastStatus.id, networkPageSize)
|
|
.enqueue(createWebserviceCallback(it))
|
|
}
|
|
}
|
|
|
|
/**
|
|
* every time it gets new items, boundary callback simply inserts them into the database and
|
|
* paging library takes care of refreshing the list if necessary.
|
|
*/
|
|
private fun insertItemsIntoDb(
|
|
response: Response<List<Conversation>>,
|
|
it: PagingRequestHelper.Request.Callback) {
|
|
ioExecutor.execute {
|
|
handleResponse(accountId, response.body())
|
|
it.recordSuccess()
|
|
}
|
|
}
|
|
|
|
override fun onItemAtFrontLoaded(itemAtFront: ConversationEntity) {
|
|
// ignored, since we only ever append to what's in the DB
|
|
}
|
|
|
|
private fun createWebserviceCallback(it: PagingRequestHelper.Request.Callback): Callback<List<Conversation>> {
|
|
return object : Callback<List<Conversation>> {
|
|
override fun onFailure(call: Call<List<Conversation>>, t: Throwable) {
|
|
it.recordFailure(t)
|
|
}
|
|
|
|
override fun onResponse(call: Call<List<Conversation>>, response: Response<List<Conversation>>) {
|
|
insertItemsIntoDb(response, it)
|
|
}
|
|
}
|
|
}
|
|
} |