Examples of com.linkedin.r2.filter.FilterChain

com.linkedin.r2.filter.FilterChain
A chain of {@link Filter}s that get a chance to process or modify the request, wire attributes, and local attributes.

Immutability

Filter chains are immutable. Adding a new filter does not change the filter chain but instead produces a copy of the filter chain with the new filter inserted.

Filter Order

Requests are processed starting from the beginning of the chain and move towards the end of the filter chain. Responses are processed from the end of the filter chain and move back towards the beginning of the filter chain.
If a request filter throws an exception, calls {@code nextFilter.onResponse(...)}, or calls {@code nextFilter.onError(..)} then that filter will have the appropriate responsemethod invoked (onResponse or onError). The response will flow back towards the beginning of the filter chain. Filters later in the chain will not get a change to process the request or the response.

Filter Priority

It is possible to implement a generic message filter and a message filter specific to a request type (RPC or REST). In general, this should be avoided. If a filter implements both types of interfaces then the more specific one is invoked and the less specific one is ignored.

Wire Attributes

Wire attributes provide a mechanism for sending request or response metadata to the remote endpoint. As an example, this facility can be used to send a unique request identifier from a client to a server.

Local Attributes

Filters must be stateless, so local attributes provide a mechanism for saving some state during the request which can be used during response processing. As an example, this facility can be used to store the time at which a request began so that total request latency can be logged when the response is received.

@author Chris Pettitt


  @Test
  public void testResponseFilter()
  {
    final MessageCountFilter filter = new MessageCountFilter();
    final FilterChain fc = FilterChains.create(filter);


    fireRpcResponse(fc);
    assertMessageCounts(0, 1, 0, filter);


    filter.reset();

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  @Test
  public void testErrorFilter()
  {
    final MessageCountFilter filter = new MessageCountFilter();
    final FilterChain fc = FilterChains.create(filter);


    fireRpcError(fc);
    assertMessageCounts(0, 0, 1, filter);


    filter.reset();

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  public void testChainRequestFilters()
  {
    final MessageCountFilter filter1 = new MessageCountFilter();
    final MessageCountFilter filter2 = new MessageCountFilter();
    final MessageCountFilter filter3 = new MessageCountFilter();
    final FilterChain fc = FilterChains.create(filter1, filter2, filter3);


    fireRpcRequest(fc);
    assertMessageCounts(1, 0, 0, filter1);
    assertMessageCounts(1, 0, 0, filter2);
    assertMessageCounts(1, 0, 0, filter3);

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  public void testChainResponseFilters()
  {
    final MessageCountFilter filter1 = new MessageCountFilter();
    final MessageCountFilter filter2 = new MessageCountFilter();
    final MessageCountFilter filter3 = new MessageCountFilter();
    final FilterChain fc = FilterChains.create(filter1, filter2, filter3);


    fireRpcResponse(fc);
    assertMessageCounts(0, 1, 0, filter1);
    assertMessageCounts(0, 1, 0, filter2);
    assertMessageCounts(0, 1, 0, filter3);

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  public void testChainErrorFilters()
  {
    final MessageCountFilter filter1 = new MessageCountFilter();
    final MessageCountFilter filter2 = new MessageCountFilter();
    final MessageCountFilter filter3 = new MessageCountFilter();
    final FilterChain fc = FilterChains.create(filter1, filter2, filter3);


    fireRpcError(fc);
    assertMessageCounts(0, 0, 1, filter1);
    assertMessageCounts(0, 0, 1, filter2);
    assertMessageCounts(0, 0, 1, filter3);

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          {
            RestLiConfig restLiConfig = new RestLiConfig();
            restLiConfig.setResourcePackageNames("com.example.fortune");
            bind(RestLiConfig.class).toInstance(restLiConfig);


            FilterChain filterChain = FilterChains.create(
                new ServerCompressionFilter(new EncodingType[] { EncodingType.SNAPPY }),
                new SimpleLoggingFilter());
            bind(FilterChain.class).toInstance(filterChain);
          }
        },

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    //using InjectMockResourceFactory to keep examples spring-free
    ResourceFactory factory = new InjectMockResourceFactory(beanProvider);


    TransportDispatcher dispatcher = new DelegatingTransportDispatcher(new RestLiServer(config, factory, engine));


    final FilterChain fc = FilterChains.empty().addLast(new ServerCompressionFilter(supportedCompression))
        .addLast(new SimpleLoggingFilter());
    return new HttpServerFactory(fc).createServer(port,
                                                  HttpServerFactory.DEFAULT_CONTEXT_PATH,
                                                  HttpServerFactory.DEFAULT_THREAD_POOL_SIZE,
                                                  dispatcher,

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  public void testReplayWithNoMatch()
  {
    final Request req = request();
    final Response res = response();
    final CaptureLastCallFilter captureFilter = new CaptureLastCallFilter();
    final FilterChain fc = getFilterChain()
            .addFirst(captureFilter);


    FilterUtil.fireUntypedRequestResponse(fc, req, res);


    Assert.assertEquals(res, captureFilter.getLastRes());

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  public void testReplayWithMatch()
  {
    final Request req = request();
    final Response res = response();
    final CaptureLastCallFilter captureFilter = new CaptureLastCallFilter();
    final FilterChain fc = getFilterChain().addFirst(captureFilter);


    // Record a response for the request we will fire
    getDb().record(req, res);


    // We should be able to fire just the request - the response should be replayed from the

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  protected void setUp() throws Exception
  {
    _serverCaptureFilter = new CaptureWireAttributesFilter();
    _clientCaptureFilter = new CaptureWireAttributesFilter();


    final FilterChain serverFilters = FilterChains.empty()
            .addFirst(_serverCaptureFilter)
            .addLast(new SendWireAttributeFilter(_toClientKey, _toClientValue, false));


    final FilterChain clientFilters = FilterChains.empty()
            .addFirst(_clientCaptureFilter)
            .addLast(new SendWireAttributeFilter(_toServerKey, _toServerValue, true));


    _client = createClient(clientFilters);

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