demo.SampleSource.java Source code

Introduction

Here is the source code for demo.SampleSource.java

Source

/*
 * Copyright 2016 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 demo;

import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.Output;
import org.springframework.context.annotation.Bean;
import org.springframework.integration.annotation.InboundChannelAdapter;
import org.springframework.integration.annotation.Poller;
import org.springframework.integration.core.MessageSource;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.support.GenericMessage;
import org.springframework.messaging.support.MessageBuilder;

/**
 * @author Ilayaperumal Gopinathan
 */
@EnableBinding(SampleSource.Source.class)
public class SampleSource {

    @Bean
    @InboundChannelAdapter(value = Source.SAMPLE, poller = @Poller(fixedDelay = "1000", maxMessagesPerPoll = "1"))
    public MessageSource<String> timerMessageSource() {
        return new MessageSource<String>() {
            public Message<String> receive() {
                System.out.println("******************");
                System.out.println("At the Source");
                System.out.println("******************");
                String value = "{\"value\":\"hi\"}";
                System.out.println("Sending value: " + value);
                return MessageBuilder.withPayload(value).setHeader(MessageHeaders.CONTENT_TYPE, "application/json")
                        .build();
            }
        };
    }

    public interface Source {
        String SAMPLE = "sample-source";

        @Output(SAMPLE)
        MessageChannel sampleSource();
    }
}