io.nats.examples.autobench.AutoBenchmark Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jnats Show documentation
Client library for working with the NATS messaging system.
The newest version!
// Copyright 2015-2018 The NATS 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 io.nats.examples.autobench;

import io.nats.client.Connection;
import io.nats.client.Options;

import java.text.NumberFormat;
import java.time.Duration;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.atomic.AtomicLong;

public abstract class AutoBenchmark {
    private final String name;
    private final long messageSize;
    private final long messageCount;
    private final AtomicLong start;
    private long runtimeNanos;
    private Exception exception;

    public AutoBenchmark(String name, long messageCount, long messageSize) {
        this.name = name;
        this.messageCount = messageCount;
        this.messageSize = messageSize;
        this.start = new AtomicLong();
    }

    public abstract void execute(Options connectOptions) throws InterruptedException;

    public String getName() {
        return this.name;
    }

    public String getSubject() {
        return generate("sub");
    }

    public String getStream() {
        return generate("stream");
    }

    private String generate(String prefix) {
        return prefix + toSafeName(getName()) + "x" + getMessageCount();
    }

    public static String toSafeName(String text) {
        StringBuilder sb = new StringBuilder();
        for (int x = 0; x < text.length(); x++) {
            char c = text.charAt(x);
            if (Character.isLetterOrDigit(c) || c == '.' || c == '-'|| c == '_') {
                sb.append(c);
            }
        }
        return sb.toString().trim();
    }

    public long getMessageSize() {
        return this.messageSize;
    }

    public long getMessageCount() {
        return this.messageCount;
    }

    public byte[] createPayload() {
        return new byte[(int)this.messageSize];
    }

    public long getStart() {
        return start.get();
    }

    public void startTiming() {
        start.set(System.nanoTime());
    }

    public void endTiming() {
        long end = System.nanoTime();
        this.runtimeNanos = end - start.get();
    }

    public void reset() {
        this.runtimeNanos = 0;
        this.exception = null;
    }

    public void defaultFlush(Connection nc) {
        try {
            nc.flush(Duration.ofSeconds(5));
        }
        catch(Exception e) { /* ignore */ }
    }

    public long getRuntimeNanos() {
        return this.runtimeNanos;
    }

    public void setException(Exception ex) {
        this.exception = ex;
    }

    public Exception getException() {
        return this.exception;
    }

    public void getFutureSafely(CompletableFuture future) {
        try {
            future.get();
        }
        catch(Exception e) { /* ignore */ }
    }

    public void beforePrintFirstOfKind() {}
    public void afterPrintLastOfKind() {}

    public void printResult() {
        if (this.runtimeNanos == 0) {
            System.out.printf("%-26s %18s\n", name, "no data from test run");
            return;
        } else if (this.exception != null) {
            String message = this.exception.getMessage();

            if (message == null) {
                message = this.exception.getClass().getCanonicalName();
            }

            System.out.printf("%-26s %12s Exception: %12s\n",
                    getName(),
                    NumberFormat.getIntegerInstance().format(this.messageCount),
                    message);
            return;
        }

        double messagesPerSecond = 1e9 * ((double)this.messageCount)/((double)this.runtimeNanos); // 1e9 for nanos to seconds
        double bytesPerSecond = 1e9 * ((double)(this.messageCount * this.messageSize))/((double)this.runtimeNanos);
        System.out.printf("%-26s %12s %18s msg/s %12s/s\n",
                            this.name,
                            NumberFormat.getIntegerInstance().format(this.messageCount),
                            NumberFormat.getIntegerInstance().format((long)messagesPerSecond),
                            AutoBenchmark.humanBytes(bytesPerSecond));
    }

    public static String humanBytes(double bytes) {
        int base = 1024;
        String[] pre = new String[] {"k", "m", "g", "t", "p", "e"};
        String post = "b";
        if (bytes < (long) base) {
            return String.format("%.2f b", bytes);
        }
        int exp = (int) (Math.log(bytes) / Math.log(base));
        int index = exp - 1;
        String units = pre[index] + post;
        return String.format("%.2f %s", bytes / Math.pow((double) base, (double) exp), units);
    }
}