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/*
 * Copyright (C) 2014 Square, Inc.
 *
 * 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 okhttp3.internal.http2

import java.io.IOException
import okhttp3.Protocol
import okio.BufferedSource

/**
 * [HTTP/2][Protocol.HTTP_2] only. Processes server-initiated HTTP requests on the client.
 * Implementations must quickly dispatch callbacks to avoid creating a bottleneck.
 *
 * While [onReset] may occur at any time, the following callbacks are expected in order,
 * correlated by stream ID.
 *
 *  * [onRequest]
 *  * [onHeaders] (unless canceled)
 *  * [onData] (optional sequence of data frames)
 *
 * As a stream ID is scoped to a single HTTP/2 connection, implementations which target multiple
 * connections should expect repetition of stream IDs.
 *
 * Return true to request cancellation of a pushed stream.  Note that this does not guarantee
 * future frames won't arrive on the stream ID.
 */
interface PushObserver {
  /**
   * Describes the request that the server intends to push a response for.
   *
   * @param streamId server-initiated stream ID: an even number.
   * @param requestHeaders minimally includes `:method`, `:scheme`, `:authority`,
   * and `:path`.
   */
  fun onRequest(streamId: Int, requestHeaders: List
): Boolean /** * The response headers corresponding to a pushed request. When [last] is true, there are * no data frames to follow. * * @param streamId server-initiated stream ID: an even number. * @param responseHeaders minimally includes `:status`. * @param last when true, there is no response data. */ fun onHeaders(streamId: Int, responseHeaders: List
, last: Boolean): Boolean /** * A chunk of response data corresponding to a pushed request. This data must either be read or * skipped. * * @param streamId server-initiated stream ID: an even number. * @param source location of data corresponding with this stream ID. * @param byteCount number of bytes to read or skip from the source. * @param last when true, there are no data frames to follow. */ @Throws(IOException::class) fun onData(streamId: Int, source: BufferedSource, byteCount: Int, last: Boolean): Boolean /** Indicates the reason why this stream was canceled. */ fun onReset(streamId: Int, errorCode: ErrorCode) companion object { @JvmField val CANCEL: PushObserver = PushObserverCancel() private class PushObserverCancel : PushObserver { override fun onRequest(streamId: Int, requestHeaders: List
): Boolean { return true } override fun onHeaders(streamId: Int, responseHeaders: List
, last: Boolean): Boolean { return true } @Throws(IOException::class) override fun onData(streamId: Int, source: BufferedSource, byteCount: Int, last: Boolean): Boolean { source.skip(byteCount.toLong()) return true } override fun onReset(streamId: Int, errorCode: ErrorCode) { } } } }




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