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/*
 * Copyright 2011-2019 the original author or authors.
 *
 * 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 org.glowroot.agent.init;

import java.util.concurrent.ScheduledExecutorService;

import org.glowroot.agent.shaded.org.glowroot.agent.it.harness.shaded.com.google.common.annotations.VisibleForTesting;
import org.glowroot.agent.shaded.org.glowroot.agent.it.harness.shaded.com.google.common.base.Ticker;
import org.glowroot.agent.shaded.org.glowroot.agent.shaded.org.slf4j.Logger;
import org.glowroot.agent.shaded.org.glowroot.agent.shaded.org.slf4j.LoggerFactory;

import org.glowroot.agent.config.ConfigService;
import org.glowroot.agent.impl.TraceCollector;
import org.glowroot.agent.impl.Transaction;
import org.glowroot.agent.impl.TransactionRegistry;
import org.glowroot.agent.util.Tickers;
import org.glowroot.agent.shaded.org.glowroot.common.util.ScheduledRunnable;

import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;

class ImmediateTraceStoreWatcher extends ScheduledRunnable {

    private static final Logger logger = LoggerFactory.getLogger(ImmediateTraceStoreWatcher.class);

    static final int PERIOD_MILLIS = 1000;

    private final ScheduledExecutorService backgroundExecutor;
    private final TransactionRegistry transactionRegistry;
    private final TraceCollector traceCollector;
    private final ConfigService configService;
    private final Ticker ticker;

    ImmediateTraceStoreWatcher(ScheduledExecutorService backgroundExecutor,
            TransactionRegistry transactionRegistry, TraceCollector traceCollector,
            ConfigService configService, Ticker ticker) {
        this.backgroundExecutor = backgroundExecutor;
        this.transactionRegistry = transactionRegistry;
        this.traceCollector = traceCollector;
        this.configService = configService;
        this.ticker = ticker;
    }

    // look for traces that will exceed the partial store threshold within the next polling interval
    // and schedule partial trace command to run at the appropriate time(s)
    @Override
    protected void runInternal() {
        int immediatePartialStoreThresholdSeconds =
                configService.getAdvancedConfig().immediatePartialStoreThresholdSeconds();
        if (immediatePartialStoreThresholdSeconds == 0) {
            return;
        }
        long immediatePartialStoreTick =
                ticker.read() - SECONDS.toNanos(immediatePartialStoreThresholdSeconds)
                        + MILLISECONDS.toNanos(PERIOD_MILLIS);
        for (Transaction transaction : transactionRegistry.getTransactions()) {
            // if the transaction is within PERIOD_MILLIS from hitting the partial trace store
            // threshold and the partial trace store hasn't already been scheduled then schedule it
            if (Tickers.lessThanOrEqual(transaction.getStartTick(), immediatePartialStoreTick)
                    && transaction.getImmedateTraceStoreRunnable() == null) {
                // schedule partial trace storage
                long initialDelayMillis =
                        Math.max(0, SECONDS.toMillis(immediatePartialStoreThresholdSeconds)
                                - NANOSECONDS.toMillis(transaction.getDurationNanos()));
                ScheduledRunnable immediateTraceStoreRunnable =
                        new ImmediateTraceStoreRunnable(transaction, traceCollector);
                immediateTraceStoreRunnable.scheduleWithFixedDelay(backgroundExecutor,
                        initialDelayMillis, SECONDS.toMillis(immediatePartialStoreThresholdSeconds),
                        MILLISECONDS);
                transaction.setImmediateTraceStoreRunnable(immediateTraceStoreRunnable);
            }
        }
    }

    @VisibleForTesting
    static class ImmediateTraceStoreRunnable extends ScheduledRunnable {

        private final Transaction transaction;
        private final TraceCollector traceCollector;
        private volatile boolean transactionPreviouslyCompleted;

        @VisibleForTesting
        ImmediateTraceStoreRunnable(Transaction transaction, TraceCollector traceCollector) {
            this.transaction = transaction;
            this.traceCollector = traceCollector;
        }

        @Override
        public void runInternal() {
            logger.debug("run(): trace.id={}", transaction.getTraceId());
            if (transaction.isCompleted()) {
                if (transactionPreviouslyCompleted) {
                    // throw marker exception to terminate subsequent scheduled executions
                    throw new TerminateSubsequentExecutionsException();
                } else {
                    // there is a small window between trace completion and cancellation of this
                    // command so give it one extra chance to be completed normally
                    transactionPreviouslyCompleted = true;
                    return;
                }
            } else if (traceCollector.shouldStoreSlow(transaction)) {
                traceCollector.storePartialTrace(transaction);
            }
        }
    }
}