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feat: make AgentExecutor a functional interface with default cancel m… #1028

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feat: make AgentExecutor a functional interface with default cancel m… #1028

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bbf7d92
feat: make AgentExecutor a functional interface with default cancel m…
malladinagarjuna2 Aug 9, 2026
f6f49da
Merge branch 'main' into feat-agentexecutor-lambda
malladinagarjuna2 Aug 9, 2026
d21e728
fix: use an import for TaskNotCancelableError instead of a FQN
malladinagarjuna2 Aug 13, 2026
6bec6be
Merge branch 'main' into feat-agentexecutor-lambda
malladinagarjuna2 Aug 13, 2026
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11 changes: 7 additions & 4 deletions server-common/src/main/java/org/a2aproject/sdk/server/agentexecution/AgentExecutor.java
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
package org.a2aproject.sdk.server.agentexecution;

import org.a2aproject.sdk.server.events.EventQueue;
import org.a2aproject.sdk.server.tasks.AgentEmitter;
import org.a2aproject.sdk.spec.A2AError;
import org.a2aproject.sdk.spec.TaskNotCancelableError;

/**
* Core business logic interface for implementing A2A agent functionality.
Expand Down Expand Up @@ -97,6 +97,7 @@
* @see org.a2aproject.sdk.server.requesthandlers.DefaultRequestHandler
* @see org.a2aproject.sdk.spec.AgentCard
*/
@FunctionalInterface
public interface AgentExecutor {
/**
* Executes the agent's business logic for a message.
Expand Down Expand Up @@ -135,7 +136,7 @@ public interface AgentExecutor {
* <p>
* <b>Error Handling:</b>
* <ul>
* <li>Throw {@link org.a2aproject.sdk.spec.TaskNotCancelableError} if your agent does not support
* <li>Throw {@link TaskNotCancelableError} if your agent does not support
* cancellation at all (e.g., fire-and-forget agents)</li>
* <li>Throw {@link A2AError} if cancellation is supported but failed to execute
* (e.g., unable to interrupt running operation)</li>
Expand All @@ -144,8 +145,10 @@ public interface AgentExecutor {
*
* @param context the request context for the task being canceled
* @param emitter the agent emitter for sending the cancellation event
* @throws org.a2aproject.sdk.spec.TaskNotCancelableError if this agent does not support cancellation
* @throws TaskNotCancelableError if this agent does not support cancellation
* @throws A2AError if cancellation is supported but failed to execute
*/
void cancel(RequestContext context, AgentEmitter emitter) throws A2AError;
default void cancel(RequestContext context, AgentEmitter emitter) throws A2AError {
throw new TaskNotCancelableError("Agent execution is not cancelable.");
}
}
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