Move back to SNAPSHOTs; fix for Reactor changes

Author: artembilan

build.gradle

@@ -90,20 +90,20 @@ ext {
 	pahoMqttClientVersion = '1.2.4'
 	postgresVersion = '42.2.14'
 	r2dbch2Version='0.8.4.RELEASE'
-	reactorVersion = '2020.0.0-M2'
+	reactorVersion = '2020.0.0-SNAPSHOT'
 	resilience4jVersion = '1.5.0'
 	romeToolsVersion = '1.12.2'
 	rsocketVersion = '1.1.0-M1'
 	saajVersion = '1.5.2'
 	servletApiVersion = '4.0.1'
 	smackVersion = '4.3.4'
 	soapVersion = '1.4.0'
-	springAmqpVersion = project.hasProperty('springAmqpVersion') ? project.springAmqpVersion : '2.3.0-M2'
-	springDataVersion = project.hasProperty('springDataVersion') ? project.springDataVersion : '2020.0.0-M2'
-	springKafkaVersion = '2.6.0-M1'
+	springAmqpVersion = project.hasProperty('springAmqpVersion') ? project.springAmqpVersion : '2.3.0-SNAPSHOT'
+	springDataVersion = project.hasProperty('springDataVersion') ? project.springDataVersion : '2020.0.0-SNAPSHOT'
+	springKafkaVersion = '2.6.0-SNAPSHOT'
 	springRetryVersion = '1.3.0'
 	springSecurityVersion = project.hasProperty('springSecurityVersion') ? project.springSecurityVersion : '5.4.0-RC1'
-	springVersion = project.hasProperty('springVersion') ? project.springVersion : '5.3.0-M2'
+	springVersion = project.hasProperty('springVersion') ? project.springVersion : '5.3.0-SNAPSHOT'
 	springWsVersion = '3.0.9.RELEASE'
 	tomcatVersion = "9.0.37"
 	xstreamVersion = '1.4.12'

spring-integration-core/src/main/java/org/springframework/integration/channel/FluxMessageChannel.java

@@ -59,7 +59,7 @@ public FluxMessageChannel() {
 	protected boolean doSend(Message<?> message, long timeout) {
 		Assert.state(this.processor.hasDownstreams(),
 				() -> "The [" + this + "] doesn't have subscribers to accept messages");
-		return this.sink.emitNext(message).hasEmitted();
+		return this.sink.tryEmitNext(message).hasSucceeded();
 	}
 
 	@Override

spring-integration-core/src/main/java/org/springframework/integration/gateway/MessagingGatewaySupport.java

@@ -894,7 +894,7 @@ private static class MonoReplyChannel implements MessageChannel, ReactiveStreams
 
 		@Override
 		public boolean send(Message<?> message, long timeout) {
-			return Boolean.TRUE.equals(this.replyMono.emitValue(message).hasEmitted());
+			return this.replyMono.tryEmitValue(message).hasSucceeded();
 		}
 
 		@Override

spring-integration-core/src/main/java/org/springframework/integration/util/IntegrationReactiveUtils.java

@@ -129,7 +129,7 @@ private static <T> Flux<Message<T>> adaptSubscribableChannelToPublisher(Subscrib
 			Sinks.Many<Message<T>> sink = Sinks.many().multicast().onBackpressureBuffer(1);
 			@SuppressWarnings("unchecked")
 			MessageHandler messageHandler = (message) -> {
-				while (!sink.emitNext((Message<T>) message).hasEmitted()) {
+				while (!sink.tryEmitNext((Message<T>) message).hasSucceeded()) {
 					LockSupport.parkNanos(100); // NOSONAR
 				}
 			};