Joseph Doherty
97 lines
4.2 KiB
Markdown
97 lines
4.2 KiB
Markdown
# Java Client
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The Java client workspace contains the MXAccess Gateway client library,
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generated protobuf/gRPC bindings, a Picocli test CLI project, and JUnit tests.
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## Layout
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```text
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clients/java/
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settings.gradle
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build.gradle
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src/main/generated/
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mxgateway-client/
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mxgateway-cli/
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```
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`mxgateway-client` generates Java protobuf and gRPC sources from
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`../../src/MxGateway.Contracts/Protos`. The Gradle protobuf plugin writes those
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generated sources under `src/main/generated`, which matches the client proto
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manifest in `../proto/proto-inputs.json`. Do not edit generated files by hand.
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`mxgateway-client` exposes `MxGatewayClientOptions`, `MxGatewayClient`,
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`MxGatewaySession`, value/status helpers, typed gateway exceptions, raw
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generated stubs, and generated protobuf messages for parity tests.
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`mxgateway-cli` depends on `mxgateway-client` and provides the `mxgw-java`
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application entry point. The CLI supports version, session, command, event
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streaming, write, and smoke-test commands with deterministic JSON output.
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## Client Usage
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Create a client with explicit transport and auth options:
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```java
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MxGatewayClientOptions options = MxGatewayClientOptions.builder()
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.endpoint("localhost:5000")
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.apiKey(System.getenv("MXGATEWAY_API_KEY"))
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.plaintext(true)
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.build();
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try (MxGatewayClient client = MxGatewayClient.connect(options);
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MxGatewaySession session = client.openSession("java-client")) {
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int serverHandle = session.register("java-client");
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int itemHandle = session.addItem(serverHandle, "TestObject.TestInt");
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session.advise(serverHandle, itemHandle);
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session.write(serverHandle, itemHandle, MxValues.int32Value(123), 0);
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}
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```
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Use `rawBlockingStub`, `rawFutureStub`, `rawAsyncStub`, `openSessionRaw`,
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`closeSessionRaw`, `invoke`, and raw session helper methods when tests need the
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underlying protobuf messages. `MxGatewayCommandException` and
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`MxAccessException` preserve the raw `MxCommandReply` when the gateway returns a
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data-bearing MXAccess failure.
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`MxEventStream` implements `Iterator<MxEvent>` and `AutoCloseable`. Closing it
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cancels the underlying gRPC stream. Canceling or timing out a Java client call
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only stops the client from waiting; it does not abort an in-flight MXAccess COM
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call on the worker STA.
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## CLI Usage
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Run the CLI through Gradle:
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```powershell
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gradle :mxgateway-cli:run --args="version --json"
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gradle :mxgateway-cli:run --args="open-session --endpoint localhost:5000 --api-key-env MXGATEWAY_API_KEY --plaintext --client-session-name java-cli --json"
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gradle :mxgateway-cli:run --args="register --endpoint localhost:5000 --api-key-env MXGATEWAY_API_KEY --plaintext --session-id <id> --client-name java-cli --json"
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gradle :mxgateway-cli:run --args="add-item --endpoint localhost:5000 --api-key-env MXGATEWAY_API_KEY --plaintext --session-id <id> --server-handle 1 --item TestObject.TestInt --json"
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gradle :mxgateway-cli:run --args="advise --endpoint localhost:5000 --api-key-env MXGATEWAY_API_KEY --plaintext --session-id <id> --server-handle 1 --item-handle 1 --json"
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gradle :mxgateway-cli:run --args="write --endpoint localhost:5000 --api-key-env MXGATEWAY_API_KEY --plaintext --session-id <id> --server-handle 1 --item-handle 1 --type int32 --value 123 --json"
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gradle :mxgateway-cli:run --args="stream-events --endpoint localhost:5000 --api-key-env MXGATEWAY_API_KEY --plaintext --session-id <id> --limit 1 --json"
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gradle :mxgateway-cli:run --args="smoke --endpoint localhost:5000 --api-key-env MXGATEWAY_API_KEY --plaintext --item TestObject.TestInt --json"
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```
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The CLI accepts `--api-key`, `--api-key-env`, `--plaintext`, `--ca-file`,
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`--server-name-override`, `--timeout`, and `--json` on gateway commands. JSON
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output redacts API keys.
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## Build And Test
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Run the Java checks from `clients/java`:
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```powershell
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gradle test
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```
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The build uses the Java 21 Gradle toolchain, compiles generated protobuf/gRPC
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code, and runs JUnit 5 tests for the client wrapper, shared behavior fixtures,
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in-process gRPC behavior, stream cancellation, and CLI parser/output behavior.
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## Related Documentation
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- [Client Proto Generation](../../docs/client-proto-generation.md)
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- [Java Client Detailed Design](../../docs/clients-java-design.md)
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- [Java Style Guide](../../docs/style-guides/JavaStyleGuide.md)
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