libraries/flicker/src/com/android/server/wm/traces/common/transactions/TransactionsTrace.kt

/*
 * Copyright (C) 2022 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.android.server.wm.traces.common.transactions

import com.android.server.wm.traces.common.ITrace
import com.android.server.wm.traces.common.Timestamp
import kotlin.js.JsName

class TransactionsTrace(override val entries: Array<TransactionsTraceEntry>) :
    ITrace<TransactionsTraceEntry>, List<TransactionsTraceEntry> by entries.toList() {

    init {
        val alwaysIncreasing =
            entries
                .toList()
                .zipWithNext { prev, next ->
                    prev.timestamp.elapsedNanos < next.timestamp.elapsedNanos
                }
                .all { it }
        require(alwaysIncreasing) { "Transaction timestamp not always increasing..." }
    }

    @JsName("allTransactions")
    val allTransactions: List<Transaction> = entries.toList().flatMap { it.transactions.toList() }

    override fun slice(startTimestamp: Timestamp, endTimestamp: Timestamp): TransactionsTrace {
        return TransactionsTrace(
            entries
                .dropWhile { it.timestamp < startTimestamp }
                .dropLastWhile { it.timestamp > endTimestamp }
                .toTypedArray()
        )
    }
}