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Client library for working with the NATS messaging system.

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// 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.NUID;
import io.nats.client.Nats;
import io.nats.client.Options;
import io.nats.client.impl.Headers;
import io.nats.client.impl.NatsMessage;

import java.io.IOException;

public class PubWithHeadersBenchmark extends AutoBenchmark {
    public PubWithHeadersBenchmark(String name, long messageCount, long messageSize) {
        super(name, messageCount, messageSize);
    }

    public void execute(Options connectOptions) throws InterruptedException {
        int msize = (int)getMessageSize();
        int headersSize = msize / 10;
        if (headersSize < 4) {
            headersSize = 4;
        }
        msize = Math.max(0, msize - headersSize);
        byte[] payload = new byte[msize];
        StringBuilder sb = new StringBuilder();
        while (sb.length() < headersSize) {
            sb.append(NUID.nextGlobal());
        }
        String headerValue = sb.substring(0, headersSize - 3);
        String subject = getSubject();

        try {
            Connection nc = Nats.connect(connectOptions);
            try {
                this.startTiming();
                for (int i = 0; i < this.getMessageCount(); i++) {
                    nc.publish(NatsMessage.builder().subject(subject).data(payload)
                        .headers(new Headers().put("hdr", headerValue))
                        .build());
                }
                defaultFlush(nc);
                this.endTiming();
            } finally {
                nc.close();
            }
        } catch (IOException ex) {
            this.setException(ex);
        }
    }
}