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feat(sdk): Add DurableInstrumentationPlugin interface and plugin runner
1 parent 89d0b6d commit c33efc2

12 files changed

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‎sdk/src/main/java/software/amazon/lambda/durable/DurableConfig.java‎

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import java.io.IOException;
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import java.io.InputStream;
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import java.time.Duration;
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import java.util.List;
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import java.util.Objects;
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import java.util.Properties;
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import java.util.concurrent.ExecutorService;
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import software.amazon.lambda.durable.client.DurableExecutionClient;
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import software.amazon.lambda.durable.client.LambdaDurableFunctionsClient;
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import software.amazon.lambda.durable.logging.LoggerConfig;
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import software.amazon.lambda.durable.plugin.DurableInstrumentationPlugin;
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import software.amazon.lambda.durable.plugin.PluginRunner;
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import software.amazon.lambda.durable.retry.PollingStrategies;
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import software.amazon.lambda.durable.retry.PollingStrategy;
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import software.amazon.lambda.durable.serde.JacksonSerDes;
@@ -94,6 +97,7 @@ public final class DurableConfig {
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private final LoggerConfig loggerConfig;
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private final PollingStrategy pollingStrategy;
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private final Duration checkpointDelay;
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private final PluginRunner pluginRunner;
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private DurableConfig(Builder builder) {
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this.durableExecutionClient = Objects.requireNonNullElseGet(
@@ -104,6 +108,7 @@ private DurableConfig(Builder builder) {
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this.loggerConfig = Objects.requireNonNullElseGet(builder.loggerConfig, LoggerConfig::defaults);
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this.pollingStrategy = Objects.requireNonNullElse(builder.pollingStrategy, PollingStrategies.Presets.DEFAULT);
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this.checkpointDelay = Objects.requireNonNullElseGet(builder.checkpointDelay, () -> Duration.ofSeconds(0));
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this.pluginRunner = builder.plugins != null ? new PluginRunner(builder.plugins) : PluginRunner.noOp();
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validateConfiguration();
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}
@@ -180,6 +185,16 @@ public Duration getCheckpointDelay() {
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return checkpointDelay;
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}
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/**
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* Gets the plugin runner that dispatches lifecycle events to registered plugins.
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*
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* @return PluginRunner instance (never null — returns no-op runner if no plugins configured)
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* @experimental This method is experimental and may be changed or removed in future releases.
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*/
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public PluginRunner getPluginRunner() {
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return pluginRunner;
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}
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public void validateConfiguration() {
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if (getDurableExecutionClient() == null) {
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throw new IllegalStateException("DurableExecutionClient configuration failed");
@@ -274,6 +289,7 @@ public static final class Builder {
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private LoggerConfig loggerConfig;
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private PollingStrategy pollingStrategy;
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private Duration checkpointDelay;
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private List<DurableInstrumentationPlugin> plugins;
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public Builder() {}
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return this;
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}
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/**
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* Sets instrumentation plugins for observability and tracing.
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*
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* <p>Plugins receive lifecycle callbacks at key points during durable execution, enabling integration with
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* tracing systems (e.g., OpenTelemetry, X-Ray), custom metrics, and logging enrichment.
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*
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* <p>Multiple plugins can be provided and will be called in order. Plugin errors are swallowed to prevent
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* instrumentation from affecting execution correctness.
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*
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* <p>Example:
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*
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* <pre>{@code
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* DurableConfig.builder()
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* .withPlugins(List.of(new OpenTelemetryDurablePlugin()))
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* .build();
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* }</pre>
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*
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* @param plugins list of instrumentation plugins
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* @return This builder
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* @experimental This method is experimental and may be changed or removed in future releases.
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*/
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public Builder withPlugins(List<DurableInstrumentationPlugin> plugins) {
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this.plugins = plugins;
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return this;
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}
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/**
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* Builds the DurableConfig instance.
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*

‎sdk/src/main/java/software/amazon/lambda/durable/plugin/AttemptEndInfo.java‎

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package software.amazon.lambda.durable.plugin;
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import java.time.Instant;
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/**
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* Information provided when an operation attempt ends.
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*
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* @param id operation ID
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* @param name human-readable operation name (may be null)
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* @param type operation type
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* @param subType operation sub-type (may be null)
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* @param parentId parent operation ID (null for root-level operations)
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* @param startTimestamp when the attempt started
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* @param endTimestamp when the attempt ended
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* @param attempt 1-based attempt number
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* @param outcome the attempt outcome (SUCCEEDED, FAILED, or RETRYING)
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* @param error non-null if the attempt failed
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* @param nextAttemptDelaySeconds non-null if outcome is RETRYING
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* @experimental This record is experimental and may be changed or removed in future releases.
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*/
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public record AttemptEndInfo(
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String id,
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String name,
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String type,
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String subType,
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String parentId,
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Instant startTimestamp,
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Instant endTimestamp,
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int attempt,
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AttemptOutcome outcome,
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Throwable error,
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Integer nextAttemptDelaySeconds) {}

‎sdk/src/main/java/software/amazon/lambda/durable/plugin/AttemptInfo.java‎

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package software.amazon.lambda.durable.plugin;
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import java.time.Instant;
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/**
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* Attempt-level information for step retry hooks.
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*
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* @param id operation ID
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* @param name human-readable operation name (may be null)
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* @param type operation type
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* @param subType operation sub-type (may be null)
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* @param parentId parent operation ID (null for root-level operations)
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* @param startTimestamp when the attempt started
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* @param attempt 1-based attempt number
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* @experimental This record is experimental and may be changed or removed in future releases.
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*/
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public record AttemptInfo(
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String id, String name, String type, String subType, String parentId, Instant startTimestamp, int attempt) {}

‎sdk/src/main/java/software/amazon/lambda/durable/plugin/AttemptOutcome.java‎

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package software.amazon.lambda.durable.plugin;
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/**
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* Possible outcomes for an operation attempt.
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*
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* @experimental This enum is experimental and may be changed or removed in future releases.
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*/
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public enum AttemptOutcome {
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SUCCEEDED,
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FAILED,
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RETRYING
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}

‎sdk/src/main/java/software/amazon/lambda/durable/plugin/DurableInstrumentationPlugin.java‎

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package software.amazon.lambda.durable.plugin;
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import java.util.Collections;
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import java.util.Map;
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import java.util.function.Supplier;
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/**
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* Plugin interface for instrumenting durable execution lifecycle events.
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*
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* <p>Implement this interface to integrate observability tools (OpenTelemetry, Datadog, etc.) with the durable
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* execution SDK. The SDK calls these hooks at key lifecycle points without requiring modifications to core SDK code.
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*
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* <p>All methods have default no-op implementations, allowing plugins to override only the hooks they need.
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*
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* <p>Plugin errors are isolated — exceptions thrown by plugin methods are caught and logged but never disrupt SDK
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* execution.
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*
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* @experimental This interface is experimental and may be changed or removed in future releases.
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*/
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public interface DurableInstrumentationPlugin {
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// ─── Execution-level hooks ───────────────────────────────────────────
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/**
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* Called once when an execution first starts (not on replay invocations). Use for sampling decisions or
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* execution-level span creation.
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*/
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default void onExecutionStart(InvocationInfo info) {}
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/**
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* Called when an execution reaches a terminal state (succeeded or failed). Use for writing summary records or
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* flushing final data.
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*
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* <p>This hook is awaited — the SDK blocks until it returns before sending the response.
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*/
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default void onExecutionEnd(ExecutionEndInfo info) {}
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// ─── Invocation-level hooks ──────────────────────────────────────────
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/**
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* Called at the start of each Lambda invocation. Use to set up per-invocation state (trace ID, invocation span).
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*/
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default void onInvocationStart(InvocationInfo info) {}
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/**
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* Wraps the entire invocation execution. Use this to set the active OTel context for the invocation scope.
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*
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* <p>This hook runs on the same thread as the user handler, making it suitable for {@code Context.makeCurrent()}
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* which uses ThreadLocal.
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*
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* @param info invocation metadata
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* @param fn the SDK invocation logic to execute
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* @return the result of executing fn
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*/
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default <T> T wrapInvocation(InvocationInfo info, Supplier<T> fn) {
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return fn.get();
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}
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/**
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* Called at the end of each Lambda invocation. Use to flush spans/metrics before Lambda freezes.
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*
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* <p>This hook is awaited — the SDK blocks until it returns. This is the only safe flush point before Lambda
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* freezes the execution environment.
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*/
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default void onInvocationEnd(InvocationInfo info) {}
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// ─── Operation-level hooks ───────────────────────────────────────────
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/**
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* Called when an operation starts for the first time (not on replay). Use to record when an operation genuinely
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* began.
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*/
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default void onOperationFirstStart(OperationInfo info) {}
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/** Called when an operation starts (including replay). Use for logging/metrics that want replay visibility. */
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default void onOperationStart(OperationInfo info) {}
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/**
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* Wraps child context execution (runInChildContext, map iterations, parallel branches). Use this to set the active
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* OTel context for child context scopes.
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*
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* <p>This hook runs on the child context thread, making it suitable for {@code Context.makeCurrent()}.
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*
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* @param info operation metadata
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* @param fn the child context logic to execute
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* @return the result of executing fn
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*/
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default <T> T wrapChildContextFn(OperationInfo info, Supplier<T> fn) {
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return fn.get();
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}
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/**
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* Called when an operation completes for the first time (not on replay). The OTel plugin creates the operation span
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* here with backfilled start/end timestamps.
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*/
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default void onOperationFirstEnd(OperationEndInfo info) {}
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// ─── Operation Attempt-level hooks ───────────────────────────────────
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/** Called before each attempt of a retryable operation (step, waitForCondition). Use to start an attempt span. */
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default void onOperationAttemptStart(AttemptInfo info) {}
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/**
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* Wraps a single operation attempt execution. Use this to set the active OTel context so auto-instrumented API
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* calls within the attempt are correctly parented under the attempt span.
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*
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* <p>This hook runs on the step thread, making it suitable for {@code Context.makeCurrent()}.
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*
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* @param info attempt metadata
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* @param fn the attempt logic to execute
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* @return the result of executing fn
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*/
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default <T> T wrapOperationAttemptFn(AttemptInfo info, Supplier<T> fn) {
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return fn.get();
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}
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/**
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* Called after each attempt completes (succeeded, failed, or retrying). Use to end the attempt span and record
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* outcome/errors.
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*/
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default void onOperationAttemptEnd(AttemptEndInfo info) {}
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// ─── Utility hooks ───────────────────────────────────────────────────
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/**
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* Called when a checkpoint response contains operation status changes. Use for real-time dashboards or metrics on
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* operation state transitions.
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*/
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default void onOperationChange(OperationChangeInfo info) {}
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/**
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* Returns additional key-value pairs to include in SDK log context via MDC. Called on each log emission. Return
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* empty map for no enrichment.
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*
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* <p>Implementations must be thread-safe as this may be called from any thread.
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*/
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default Map<String, String> enrichLogContext() {
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return Collections.emptyMap();
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}
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}

‎sdk/src/main/java/software/amazon/lambda/durable/plugin/ExecutionEndInfo.java‎

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package software.amazon.lambda.durable.plugin;
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import java.util.Map;
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import software.amazon.awssdk.services.lambda.model.Operation;
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/**
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* Information provided when a durable execution ends.
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*
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* @param requestId the Lambda request ID
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* @param executionArn the durable execution ARN
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* @param status the execution outcome (SUCCEEDED or FAILED)
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* @param executionResult the result if succeeded (may be null)
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* @param executionError the error if failed (may be null)
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* @param executionInput the original execution input
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* @param operations all operations in the execution (final state)
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* @experimental This record is experimental and may be changed or removed in future releases.
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*/
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public record ExecutionEndInfo(
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String requestId,
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String executionArn,
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ExecutionStatus status,
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Object executionResult,
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Throwable executionError,
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Object executionInput,
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Map<String, Operation> operations) {}

‎sdk/src/main/java/software/amazon/lambda/durable/plugin/ExecutionStatus.java‎

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package software.amazon.lambda.durable.plugin;
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/**
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* Terminal status of a durable execution.
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*
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* @experimental This enum is experimental and may be changed or removed in future releases.
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*/
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public enum ExecutionStatus {
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SUCCEEDED,
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FAILED
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}

‎sdk/src/main/java/software/amazon/lambda/durable/plugin/InvocationInfo.java‎

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package software.amazon.lambda.durable.plugin;
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/**
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* Invocation-level information available to plugin hooks.
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*
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* @param requestId the Lambda request ID for this invocation
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* @param executionArn the durable execution ARN
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* @experimental This record is experimental and may be changed or removed in future releases.
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*/
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public record InvocationInfo(String requestId, String executionArn) {}

‎sdk/src/main/java/software/amazon/lambda/durable/plugin/OperationChangeInfo.java‎

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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package software.amazon.lambda.durable.plugin;
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import java.util.Map;
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import software.amazon.awssdk.services.lambda.model.Operation;
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/**
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* Information about operation state changes from a checkpoint response.
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*
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* @param requestId the Lambda request ID
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* @param executionArn the durable execution ARN
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* @param updatedOperations operations whose status changed in this checkpoint response
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* @param operations all operations in the execution (current state)
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* @experimental This record is experimental and may be changed or removed in future releases.
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*/
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public record OperationChangeInfo(
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String requestId,
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String executionArn,
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Map<String, Operation> updatedOperations,
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Map<String, Operation> operations) {}

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