Examples of com.linkedin.r2.filter.FilterChain

com.linkedin.r2.message.rest.RestRequest
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

  private void executeRequestThroughParseqDebugHandler(URI uri, Callback<RestResponse> callback)
  {
    ParseqTraceDebugRequestHandler requestHandler = new ParseqTraceDebugRequestHandler();
    RestRequestBuilder requestBuilder = new RestRequestBuilder(uri);
    RestRequest request = requestBuilder.build();
    RequestContext requestContext = new RequestContext();


    requestHandler.handleRequest(request,
                                  requestContext,
                                  new RestLiDebugRequestHandler.ResourceDebugRequestHandler()
                                  {

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                }
            }


        } catch(ExecutionException e) {
            if(e.getCause() instanceof RestException) {
                RestException exception = (RestException) e.getCause();
                if(logger.isDebugEnabled()) {
                    logger.debug("REST EXCEPTION STATUS : " + exception.getResponse().getStatus());
                }
                if(exception.getResponse().getStatus() == NOT_FOUND.getCode()) {
                    return false;
                }
            } else {
                throw new VoldemortException("Unknown HTTP request execution exception: "
                                             + e.getMessage(), e);

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                    logger.debug("Did not get any response!");
                }
            }
        } catch(ExecutionException e) {
            if(e.getCause() instanceof RestException) {
                RestException exception = (RestException) e.getCause();
                if(logger.isDebugEnabled()) {
                    logger.debug("REST EXCEPTION STATUS : " + exception.getResponse().getStatus());
                }


            } else {
                throw new VoldemortException("Unknown HTTP request execution exception: "
                                             + e.getMessage(), e);

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            RestResponse response = fetchGetResponse(rb, FETCH_SCHEMA_TIMEOUT_MS);
            return response.getEntity().asString("UTF-8");
        } catch(ExecutionException e) {
            if(e.getCause() instanceof RestException) {
                RestException exception = (RestException) e.getCause();
                if(logger.isDebugEnabled()) {
                    logger.debug("REST EXCEPTION STATUS : " + exception.getResponse().getStatus());
                }
            } else {
                throw new VoldemortException("Unknown HTTP request execution exception: "
                                             + e.getMessage(), e);
            }

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                    logger.debug("Empty response !");
                }
            }
        } catch(ExecutionException e) {
            if(e.getCause() instanceof RestException) {
                RestException exception = (RestException) e.getCause();
                if(logger.isDebugEnabled()) {
                    logger.debug("REST EXCEPTION STATUS : " + exception.getResponse().getStatus());
                }


                int httpErrorStatus = exception.getResponse().getStatus();
                if(httpErrorStatus == BAD_REQUEST.getCode()) {
                    throw new VoldemortException("Bad request: " + e.getMessage(), e);
                } else if(httpErrorStatus == PRECONDITION_FAILED.getCode()) {
                    throw new ObsoleteVersionException(e.getMessage());
                } else if(httpErrorStatus == REQUEST_TIMEOUT.getCode()

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                    }
                }
            }
        } catch(ExecutionException e) {
            if(e.getCause() instanceof RestException) {
                RestException exception = (RestException) e.getCause();
                if(logger.isDebugEnabled()) {
                    logger.debug("REST EXCEPTION STATUS : " + exception.getResponse().getStatus());
                }
            } else {
                throw new VoldemortException("Unknown HTTP request execution exception: "
                                             + e.getMessage(), e);
            }

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                    logger.debug("Did not get any response!");
                }
            }
        } catch(ExecutionException e) {
            if(e.getCause() instanceof RestException) {
                RestException exception = (RestException) e.getCause();
                if(logger.isDebugEnabled()) {
                    logger.debug("REST EXCEPTION STATUS : " + exception.getResponse().getStatus());
                }


            } else {
                throw new VoldemortException("Unknown HTTP request execution exception: "
                                             + e.getMessage(), e);

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    }


    private void handleRequestAndResponseException(Exception e) {
        if(e instanceof ExecutionException) {
            if(e.getCause() instanceof RestException) {
                RestException re = (RestException) e.getCause();
                if(logger.isDebugEnabled()) {
                    logger.debug("REST Exception Status: " + re.getResponse().getStatus());
                }
            } else {
                throw new VoldemortException("Unknown HTTP request execution exception: "
                                             + e.getMessage(), e);
            }

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                if(serializedVC != null && serializedVC.length() > 0) {
                    rb.setHeader(RestMessageHeaders.X_VOLD_VECTOR_CLOCK, serializedVC);
                }
            }


            RestRequest request = rb.build();
            Future<RestResponse> f = client.restRequest(request);


            // This will block
            RestResponse response = f.get();
            final ByteString entity = response.getEntity();

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                                     this.routingTypeCode);
        }
        if(this.zoneId != INVALID_ZONE_ID) {
            requestBuilder.setHeader(RestMessageHeaders.X_VOLD_ZONE_ID, String.valueOf(this.zoneId));
        }
        RestRequest request = requestBuilder.build();
        Future<RestResponse> f = client.restRequest(request);
        // This will block
        return f.get();
    }

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