Merge pull request #255 from conductor-oss/client_sdks_java_v3

Added (incubating) Java Client v3 project to `conductor-clients` dir

conductor-clients/README.md

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+# Conductor Clients

conductor-clients/java/conductor-java-sdk/LICENSE

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conductor-clients/java/conductor-java-sdk/README.md

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+# Conductor Java Client/SDK V3
+
+## Overview
+
+**This project is currently in incubating status**. 
+
+It is under active development and subject to changes as it evolves. While the core features are functional, the project is not yet considered stable, and breaking changes may occur as we refine the architecture and add new functionality.
+
+These changes are largely driven by **"dependency optimization"** and a redesign of the client to introduces filters, events and listeners to allow extensibility through callbacks or Event-Driven Architecture, IoC.
+
+This client has a reduced dependency set. The aim is to minimize Classpath pollution and prevent potential conflicts.
+
+Take Netflix Eureka as an example, Spring Cloud users have reported version conflicts. Some of them weren't even using Eureka. So, we've decided to remove the direct dependency.
+
+In the client it's used by the `TaskPollExecutor` before polling to make the following check:
+
+```java
+if (eurekaClient != null
+        && !eurekaClient.getInstanceRemoteStatus().equals(InstanceStatus.UP)
+        && !discoveryOverride) {
+    LOGGER.debug("Instance is NOT UP in discovery - will not poll");
+    return;
+}
+```
+
+You will be able to achieve the same with a `PollFilter`. It could look something like this:
+
+```java
+ var runnerConfigurer = new TaskRunnerConfigurer
+        .Builder(taskClient, List.of(new ApprovalWorker()))
+        .withThreadCount(10)
+        .withPollFilter((String taskType, String domain) -> {
+            return eurekaClient.getInstanceRemoteStatus().equals(InstanceStatus.UP);
+        })
+        .withListener(PollCompleted.class, (e) -> {
+            log.info("Poll Completed {}", e);
+            var timer = prometheusRegistry.timer("poll_success", "type", e.getTaskType());
+            timer.record(e.getDuration());
+        })
+        .withListener(TaskExecutionFailure.class, (e) -> {
+            log.error("Task Execution Failure {}", e);
+            var counter = prometheusRegistry.counter("execute_failure", "type", e.getTaskType(), "id", e.getTaskId());
+            counter.increment();
+        })
+        .build();
+runnerConfigurer.init();
+```
+
+The telemetry part was also removed but you can achieve the same with Events and Listeners as shown in the example.
+
+### Breaking Changes
+
+While we aim to minimize breaking changes, there are a few areas where such changes are necessary. 
+
+Below are two specific examples of where changes may affect your existing code:
+
+#### (1) Jersey Config
+
+The `WorkflowClient` and other clients will retain the same methods, but constructors with dependencies on Jersey are being removed. For example:
+
+```java
+public WorkflowClient(ClientConfig config, ClientHandler handler) {
+     this(config, new DefaultConductorClientConfiguration(), handler);
+}
+```
+
+#### (2) Eureka Client
+
+In the Worker API we've removed the Eureka Client configuration option (from `TaskRunnerConfigurer`).
+
+```java
+* @param eurekaClient Eureka client - used to identify if the server is in discovery or
+ *     not. When the server goes out of discovery, the polling is terminated. If passed
+ *     null, discovery check is not done.
+ * @return Builder instance
+ */
+public Builder withEurekaClient(EurekaClient eurekaClient) {
+    this.eurekaClient = eurekaClient;
+    return this;
+}
+```
+
+## TODO
+
+- Stabilize the codebase
+- Complete documentation
+- Gather community feedback
+- Achieve production readiness
+

conductor-clients/java/conductor-java-sdk/build.gradle

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+plugins {
+    id 'com.diffplug.spotless' version '6.+'
+}
+
+group = 'io.orkes.conductor'
+
+apply from: "$rootDir/versions.gradle"
+
+subprojects {
+    apply plugin: 'java'
+    apply plugin: 'com.diffplug.spotless'
+    group = 'io.orkes.conductor'
+
+    spotless {
+        java {
+            removeUnusedImports()
+            importOrder('java', 'javax', 'org', 'com.netflix', 'io.orkes', '', '\\#com.netflix', '\\#')
+            licenseHeaderFile("$rootDir/licenseheader.txt")
+        }
+    }
+
+    compileJava {
+        sourceCompatibility = 11
+        targetCompatibility = 11
+    }
+
+    dependencies {
+        // ### candidates to be shadowed ###
+        implementation "com.google.guava:guava:${versions.guava}"
+        // #################################
+
+        implementation "com.fasterxml.jackson.core:jackson-databind:${versions.jackson}"
+        implementation "com.fasterxml.jackson.core:jackson-core:${versions.jackson}"
+        implementation "com.fasterxml.jackson.core:jackson-annotations:${versions.jackson}"
+        implementation "com.fasterxml.jackson.datatype:jackson-datatype-jsr310:${versions.jackson}"
+
+        implementation "org.slf4j:slf4j-api:${versions.slf4j}"
+        implementation "org.apache.commons:commons-lang3:${versions.commonsLang}"
+        annotationProcessor "org.projectlombok:lombok:${versions.lombok}"
+        compileOnly "org.projectlombok:lombok:${versions.lombok}"
+    }
+
+    repositories {
+        mavenCentral()
+        mavenLocal()
+        maven {
+            url "https://s01.oss.sonatype.org/content/repositories/releases/"
+        }
+    }
+
+    tasks.withType(Javadoc) {
+        options.addStringOption('Xdoclint:none', '-quiet')
+    }
+
+}