io.knotx.knot.assembler.impl.FragmentAssemblerKnotProxyImpl.java Source code

Introduction

Here is the source code for io.knotx.knot.assembler.impl.FragmentAssemblerKnotProxyImpl.java

Source

/*
 * Copyright (C) 2016 Cognifide Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.knotx.knot.assembler.impl;

import io.knotx.dataobjects.ClientResponse;
import io.knotx.dataobjects.KnotContext;
import io.knotx.knot.AbstractKnotProxy;
import io.knotx.knot.assembler.FragmentAssemblerConfiguration;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.http.HttpHeaders;
import io.vertx.core.json.JsonObject;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import io.vertx.rxjava.core.MultiMap;
import java.util.Set;
import java.util.stream.Collectors;
import org.apache.commons.lang3.StringUtils;
import rx.Single;

public class FragmentAssemblerKnotProxyImpl extends AbstractKnotProxy {

    private static final Logger LOGGER = LoggerFactory.getLogger(FragmentAssemblerKnotProxyImpl.class);

    private FragmentAssemblerConfiguration configuration;

    public FragmentAssemblerKnotProxyImpl(JsonObject config) {
        this.configuration = new FragmentAssemblerConfiguration(config);
    }

    @Override
    protected Single<KnotContext> processRequest(KnotContext knotContext) {
        if (hasFragments(knotContext)) {
            try {
                String joinedFragments = knotContext.getFragments().stream()
                        .map(configuration.unprocessedFragmentStrategy()::get).collect(Collectors.joining());

                return Single.just(createSuccessResponse(knotContext, joinedFragments));
            } catch (Exception ex) {
                LOGGER.error("Exception happened during Fragment assembly.", ex);
                return Single.just(processError(knotContext, ex));
            }
        } else {
            LOGGER.error("Fragments are empty or not exists in KnotContext.");
            return Single.just(processError(knotContext, null));
        }
    }

    private boolean hasFragments(KnotContext knotContext) {
        return knotContext.getFragments() != null && !knotContext.getFragments().isEmpty();
    }

    @Override
    protected boolean shouldProcess(Set<String> knots) {
        return true;
    }

    @Override
    protected KnotContext processError(KnotContext knotContext, Throwable error) {
        ClientResponse errorResponse = new ClientResponse()
                .setStatusCode(HttpResponseStatus.INTERNAL_SERVER_ERROR.code());

        return new KnotContext().setClientRequest(knotContext.getClientRequest()).setClientResponse(errorResponse);
    }

    private KnotContext createSuccessResponse(KnotContext inputContext, String renderedContent) {
        ClientResponse clientResponse = inputContext.getClientResponse();
        if (StringUtils.isBlank(renderedContent)) {
            clientResponse.setStatusCode(HttpResponseStatus.NO_CONTENT.code());
        } else {
            MultiMap headers = clientResponse.getHeaders();
            headers.add(HttpHeaders.CONTENT_LENGTH.toString().toLowerCase(),
                    Integer.toString(renderedContent.length()));

            clientResponse.setBody(Buffer.buffer(renderedContent)).setHeaders(headers);
            clientResponse.setStatusCode(HttpResponseStatus.OK.code());
        }

        return new KnotContext().setClientRequest(inputContext.getClientRequest())
                .setClientResponse(clientResponse);
    }
}