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Void return types need to always be null value #728

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Void return types need to always be null value #728

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45 changes: 45 additions & 0 deletions ...sonrpc.debug/src/test/java/org/eclipse/lsp4j/jsonrpc/debug/test/DebugIntegrationTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,12 @@ public static interface MyServer {
CompletableFuture<MyParam> askServer(MyParam param);
}


public static interface MyVoidServer {
@JsonRequest
CompletableFuture<Void> askServer(MyParam param);
}

public static interface MyClient {
@JsonRequest
CompletableFuture<MyParam> askClient(MyParam param);
Expand Down Expand Up @@ -99,6 +105,45 @@ public CompletableFuture<MyParam> askServer(MyParam param) {
Assert.assertEquals("BAR", barFuture.get(TIMEOUT, TimeUnit.MILLISECONDS).value);
}

@Test
public void testVoidResponse() throws Exception {
// create client side
PipedInputStream in = new PipedInputStream();
PipedOutputStream out = new PipedOutputStream();
PipedInputStream in2 = new PipedInputStream();
PipedOutputStream out2 = new PipedOutputStream();

in.connect(out2);
out.connect(in2);

MyClient client = new MyClient() {
@Override
public CompletableFuture<MyParam> askClient(MyParam param) {
throw new UnsupportedOperationException("Unused by this test");
}
};
Launcher<MyVoidServer> clientSideLauncher = DebugLauncher.createLauncher(client, MyVoidServer.class, in, out);

// create server side
MyServer server = new MyServer() {
@Override
public CompletableFuture<MyParam> askServer(MyParam param) {
return CompletableFuture.completedFuture(param);
}
};
Launcher<MyClient> serverSideLauncher = DebugLauncher.createLauncher(server, MyClient.class, in2, out2);

clientSideLauncher.startListening();
serverSideLauncher.startListening();

// We call a method that is declared as returning Void, but the other end returns a non-null value
// make sure that the json parsing discards that result
CompletableFuture<Void> fooFuture = clientSideLauncher.getRemoteProxy().askServer(new MyParam("FOO"));

Void void1 = fooFuture.get(TIMEOUT, TimeUnit.MILLISECONDS);
Assert.assertNull(void1);
}

@Test
public void testCancellation() throws Exception {
// create client side
Expand Down
34 changes: 10 additions & 24 deletions .../src/test/java/org/eclipse/lsp4j/jsonrpc/debug/test/json/DebugMessageJsonHandlerTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -850,7 +850,7 @@ public void testParseSyntaxErrorRequest() {
}
}

private Object voidResponse(String body) {
private void voidResponse(String body) {
Map<String, JsonRpcMethod> supportedMethods = new LinkedHashMap<>();
supportedMethods.put("foo", JsonRpcMethod.request("foo", new TypeToken<Void>() {
}.getType(), new TypeToken<Void>() {
Expand All @@ -870,56 +870,42 @@ private Object voidResponse(String body) {
+ "\"success\":true"//
+ bodyField //
+ "}\n");
return ((ResponseMessage) message).getResult();
Object result = ((ResponseMessage) message).getResult();
Assert.assertNull(result);
}

@Test
public void testVoidResponse_noBody() {
Assert.assertNull(voidResponse(null));
voidResponse(null);
}

@Test
public void testVoidResponse_null() {
Assert.assertNull(voidResponse("null"));

voidResponse("null");
}

@Test
public void testVoidResponse_primitive() {
Object result = voidResponse("true");
JsonPrimitive jsonPrimitive = (JsonPrimitive) result;
Assert.assertTrue(jsonPrimitive.getAsBoolean());
voidResponse("true");
}

@Test
public void testVoidResponse_emptyArray() {
Object result = voidResponse("[]");
JsonArray jsonArray = (JsonArray) result;
Assert.assertTrue(jsonArray.isEmpty());
voidResponse("[]");
}

@Test
public void testVoidResponse_array() {
Object result = voidResponse("[1,2,3]");
JsonArray jsonArray = (JsonArray) result;
Assert.assertEquals(1, jsonArray.get(0).getAsInt());
Assert.assertEquals(2, jsonArray.get(1).getAsInt());
Assert.assertEquals(3, jsonArray.get(2).getAsInt());
voidResponse("[1,2,3]");
}

@Test
public void testVoidResponse_emptyObject() {
Object result = voidResponse("{}");
Assert.assertTrue(result instanceof JsonObject);
JsonObject jsonObject = (JsonObject) result;
Assert.assertTrue(jsonObject.entrySet().isEmpty());
voidResponse("{}");
}

@Test
public void testVoidResponse_object() {
Object result = voidResponse("{\"allThreadsContinued\":false}");
Assert.assertTrue(result instanceof JsonObject);
JsonObject jsonObject = (JsonObject) result;
Assert.assertFalse(jsonObject.getAsJsonPrimitive("allThreadsContinued").getAsBoolean());
voidResponse("{\"allThreadsContinued\":false}");
}
}
2 changes: 1 addition & 1 deletion ...p4j.jsonrpc/src/main/java/org/eclipse/lsp4j/jsonrpc/json/adapters/MessageTypeAdapter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -350,7 +350,7 @@ protected Object fromJson(JsonElement element, Type type) {
return null;
}
if (isNullOrVoidType(type)) {
return element;
return null;
}
Object value = gson.fromJson(element, type);
if (isNull(value)) {
Expand Down
45 changes: 45 additions & 0 deletions org.eclipse.lsp4j.jsonrpc/src/test/java/org/eclipse/lsp4j/jsonrpc/test/IntegrationTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@
import org.eclipse.lsp4j.jsonrpc.Launcher;
import org.eclipse.lsp4j.jsonrpc.RemoteEndpoint;
import org.eclipse.lsp4j.jsonrpc.ResponseErrorException;

import org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer;
import org.eclipse.lsp4j.jsonrpc.messages.Either;
import org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint;
Expand Down Expand Up @@ -88,6 +89,11 @@ public static interface MyServer {
@JsonRequest
CompletableFuture<MyParam> askServer(MyParam param);
}

public static interface MyVoidServer {
@JsonRequest
CompletableFuture<Void> askServer(MyParam param);
}

public static class MyServerImpl implements MyServer {
@Override
Expand Down Expand Up @@ -224,6 +230,45 @@ public void testEitherNull() throws Exception {
out.toString());
}

@Test
public void testVoidResponse() throws Exception {
// create client side
PipedInputStream in = new PipedInputStream();
PipedOutputStream out = new PipedOutputStream();
PipedInputStream in2 = new PipedInputStream();
PipedOutputStream out2 = new PipedOutputStream();

in.connect(out2);
out.connect(in2);

MyClient client = new MyClient() {
@Override
public CompletableFuture<MyParam> askClient(MyParam param) {
throw new UnsupportedOperationException("Unused by this test");
}
};
Launcher<MyVoidServer> clientSideLauncher = Launcher.createLauncher(client, MyVoidServer.class, in, out);

// create server side
MyServer server = new MyServer() {
@Override
public CompletableFuture<MyParam> askServer(MyParam param) {
return CompletableFuture.completedFuture(param);
}
};
Launcher<MyClient> serverSideLauncher = Launcher.createLauncher(server, MyClient.class, in2, out2);

clientSideLauncher.startListening();
serverSideLauncher.startListening();

// We call a method that is declared as returning Void, but the other end returns a non-null value
// make sure that the json parsing discards that result
CompletableFuture<Void> fooFuture = clientSideLauncher.getRemoteProxy().askServer(new MyParam("FOO"));

Void void1 = fooFuture.get(TIMEOUT, TimeUnit.MILLISECONDS);
Assert.assertNull(void1);
}


@Test
public void testCancellation() throws Exception {
Expand Down