ThenChain.java

package com.functions;

import com.microsoft.azure.functions.ExecutionContext;
import com.microsoft.azure.functions.HttpMethod;
import com.microsoft.azure.functions.HttpRequestMessage;
import com.microsoft.azure.functions.HttpResponseMessage;
import com.microsoft.azure.functions.annotation.AuthorizationLevel;
import com.microsoft.azure.functions.annotation.FunctionName;
import com.microsoft.azure.functions.annotation.HttpTrigger;
import io.dapr.durabletask.DurableTaskClient;
import io.dapr.durabletask.TaskOrchestrationContext;
import com.microsoft.durabletask.azurefunctions.DurableClientContext;
import com.microsoft.durabletask.azurefunctions.DurableClientInput;
import com.microsoft.durabletask.azurefunctions.DurableOrchestrationTrigger;

import java.util.Optional;

public class ThenChain {
    @FunctionName("StartOrchestrationThenChain")
    public HttpResponseMessage startOrchestrationThenChain(
            @HttpTrigger(name = "req", methods = {HttpMethod.GET, HttpMethod.POST}, authLevel = AuthorizationLevel.ANONYMOUS) HttpRequestMessage<Optional<String>> request,
            @DurableClientInput(name = "durableContext") DurableClientContext durableContext,
            final ExecutionContext context) {
        context.getLogger().info("Java HTTP trigger processed a request.");

        DurableTaskClient client = durableContext.getClient();
        String instanceId = client.scheduleNewOrchestrationInstance("ThenChain");
        context.getLogger().info("Created new Java orchestration with instance ID = " + instanceId);
        return durableContext.createCheckStatusResponse(request, instanceId);
    }

    @FunctionName("ThenChain")
    public String thenChain(
            @DurableOrchestrationTrigger(name = "ctx") TaskOrchestrationContext ctx) {
        String result = "";
        result += ctx.callActivity("Capitalize", "Austin", String.class).thenApply(s -> s + "-test").await();
        return result;
    }

}