New native support for end to end reactive streaming through the reac…

…tive-assembler-core and reactive-assembler-flux modules

reactive-assembler-core/.gitignore

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+.gradle
+/build/
+!gradle/wrapper/gradle-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+.nb-gradle/

reactive-assembler-core/build.gradle

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+ext {
+    reactorVersion = '3.3.8.RELEASE'
+}
+
+dependencies {
+    compile project(':assembler-util')
+
+    testCompile project(':assembler-core').sourceSets.test.output
+
+    testCompile "io.projectreactor:reactor-test:${reactorVersion}"
+    compile "io.projectreactor:reactor-core:${reactorVersion}"
+}

reactive-assembler-core/src/main/java/io/github/pellse/reactive/assembler/Assembler.java

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+/*
+ * Copyright 2018 Sebastien Pelletier
+ *
+ * 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.github.pellse.reactive.assembler;
+
+import org.reactivestreams.Publisher;
+
+/**
+ * @param <T>  Type for Top Level Entity e.g. {@code Customer}
+ * @param <RC> Output Type e.g. {@code Stream<Transaction>} or {@code Flux<Transaction>}
+ */
+public interface Assembler<T, RC> {
+    RC assemble(Publisher<T> topLevelEntities);
+}

reactive-assembler-core/src/main/java/io/github/pellse/reactive/assembler/AssemblerAdapter.java

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+/*
+ * Copyright 2018 Sebastien Pelletier
+ *
+ * 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.github.pellse.reactive.assembler;
+
+import org.reactivestreams.Publisher;
+
+import java.util.List;
+import java.util.Map;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+@FunctionalInterface
+public interface AssemblerAdapter<T, ID, R, RC> {
+
+    RC convertMapperSources(Publisher<T> topLevelEntitiesProvider,
+                            Function<Iterable<T>, Stream<Publisher<? extends Map<ID, ?>>>> mapperSourcesBuilder,
+                            BiFunction<Iterable<T>, List<Map<ID, ?>>, Stream<R>> aggregateStreamBuilder);
+}