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 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
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package org.apache.hc.client5.http.impl.async;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.concurrent.CancellationException;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;

import org.apache.hc.client5.http.DnsResolver;
import org.apache.hc.client5.http.config.Configurable;
import org.apache.hc.client5.http.config.ConnectionConfig;
import org.apache.hc.client5.http.config.RequestConfig;
import org.apache.hc.client5.http.impl.ConnPoolSupport;
import org.apache.hc.client5.http.impl.ExecSupport;
import org.apache.hc.client5.http.impl.classic.RequestFailedException;
import org.apache.hc.client5.http.impl.nio.MultihomeConnectionInitiator;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.concurrent.Cancellable;
import org.apache.hc.core5.concurrent.ComplexCancellable;
import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.function.Resolver;
import org.apache.hc.core5.http.EntityDetails;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.nio.AsyncClientExchangeHandler;
import org.apache.hc.core5.http.nio.AsyncPushConsumer;
import org.apache.hc.core5.http.nio.CapacityChannel;
import org.apache.hc.core5.http.nio.DataStreamChannel;
import org.apache.hc.core5.http.nio.HandlerFactory;
import org.apache.hc.core5.http.nio.RequestChannel;
import org.apache.hc.core5.http.nio.command.RequestExecutionCommand;
import org.apache.hc.core5.http.nio.command.ShutdownCommand;
import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.io.CloseMode;
import org.apache.hc.core5.reactor.Command;
import org.apache.hc.core5.reactor.ConnectionInitiator;
import org.apache.hc.core5.reactor.DefaultConnectingIOReactor;
import org.apache.hc.core5.reactor.IOEventHandlerFactory;
import org.apache.hc.core5.reactor.IOReactorConfig;
import org.apache.hc.core5.reactor.IOSession;
import org.apache.hc.core5.util.Timeout;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Minimal implementation of HTTP/2 only {@link CloseableHttpAsyncClient}. This client
 * is optimized for HTTP/2 multiplexing message transport and does not support advanced
 * HTTP protocol functionality such as request execution via a proxy, state management,
 * authentication and request redirects.
 * 

* Concurrent message exchanges with the same connection route executed by * this client will get automatically multiplexed over a single physical HTTP/2 * connection. *

* * @since 5.0 */ @Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL) public final class MinimalH2AsyncClient extends AbstractMinimalHttpAsyncClientBase { private static final Logger LOG = LoggerFactory.getLogger(MinimalH2AsyncClient.class); private final InternalH2ConnPool connPool; private final ConnectionInitiator connectionInitiator; MinimalH2AsyncClient( final IOEventHandlerFactory eventHandlerFactory, final AsyncPushConsumerRegistry pushConsumerRegistry, final IOReactorConfig reactorConfig, final ThreadFactory threadFactory, final ThreadFactory workerThreadFactory, final DnsResolver dnsResolver, final TlsStrategy tlsStrategy) { super(new DefaultConnectingIOReactor( eventHandlerFactory, reactorConfig, workerThreadFactory, LoggingIOSessionDecorator.INSTANCE, LoggingExceptionCallback.INSTANCE, null, ioSession -> ioSession.enqueue(new ShutdownCommand(CloseMode.GRACEFUL), Command.Priority.IMMEDIATE)), pushConsumerRegistry, threadFactory); this.connectionInitiator = new MultihomeConnectionInitiator(getConnectionInitiator(), dnsResolver); this.connPool = new InternalH2ConnPool(this.connectionInitiator, object -> null, tlsStrategy); } @Override public Cancellable execute( final AsyncClientExchangeHandler exchangeHandler, final HandlerFactory pushHandlerFactory, final HttpContext context) { final ComplexCancellable cancellable = new ComplexCancellable(); try { if (!isRunning()) { throw new CancellationException("Request execution cancelled"); } final HttpClientContext clientContext = context != null ? HttpClientContext.adapt(context) : HttpClientContext.create(); exchangeHandler.produceRequest((request, entityDetails, context1) -> { RequestConfig requestConfig = null; if (request instanceof Configurable) { requestConfig = ((Configurable) request).getConfig(); } if (requestConfig != null) { clientContext.setRequestConfig(requestConfig); } else { requestConfig = clientContext.getRequestConfig(); } @SuppressWarnings("deprecation") final Timeout connectTimeout = requestConfig.getConnectTimeout(); final HttpHost target = new HttpHost(request.getScheme(), request.getAuthority()); final Future sessionFuture = connPool.getSession(target, connectTimeout, new FutureCallback() { @Override public void completed(final IOSession session) { final AsyncClientExchangeHandler internalExchangeHandler = new AsyncClientExchangeHandler() { @Override public void releaseResources() { exchangeHandler.releaseResources(); } @Override public void failed(final Exception cause) { exchangeHandler.failed(cause); } @Override public void cancel() { failed(new RequestFailedException("Request aborted")); } @Override public void produceRequest( final RequestChannel channel, final HttpContext context1) throws HttpException, IOException { channel.sendRequest(request, entityDetails, context1); } @Override public int available() { return exchangeHandler.available(); } @Override public void produce(final DataStreamChannel channel) throws IOException { exchangeHandler.produce(channel); } @Override public void consumeInformation( final HttpResponse response, final HttpContext context1) throws HttpException, IOException { exchangeHandler.consumeInformation(response, context1); } @Override public void consumeResponse( final HttpResponse response, final EntityDetails entityDetails, final HttpContext context1) throws HttpException, IOException { exchangeHandler.consumeResponse(response, entityDetails, context1); } @Override public void updateCapacity(final CapacityChannel capacityChannel) throws IOException { exchangeHandler.updateCapacity(capacityChannel); } @Override public void consume(final ByteBuffer src) throws IOException { exchangeHandler.consume(src); } @Override public void streamEnd(final List trailers) throws HttpException, IOException { exchangeHandler.streamEnd(trailers); } }; if (LOG.isDebugEnabled()) { final String exchangeId = ExecSupport.getNextExchangeId(); clientContext.setExchangeId(exchangeId); if (LOG.isDebugEnabled()) { LOG.debug("{} executing message exchange {}", exchangeId, ConnPoolSupport.getId(session)); } session.enqueue( new RequestExecutionCommand( new LoggingAsyncClientExchangeHandler(LOG, exchangeId, internalExchangeHandler), pushHandlerFactory, cancellable, clientContext), Command.Priority.NORMAL); } else { session.enqueue( new RequestExecutionCommand( internalExchangeHandler, pushHandlerFactory, cancellable, clientContext), Command.Priority.NORMAL); } } @Override public void failed(final Exception ex) { exchangeHandler.failed(ex); } @Override public void cancelled() { exchangeHandler.cancel(); } }); cancellable.setDependency(() -> sessionFuture.cancel(true)); }, context); } catch (final HttpException | IOException | IllegalStateException ex) { exchangeHandler.failed(ex); } return cancellable; } /** * Sets {@link Resolver} for {@link ConnectionConfig} on a per host basis. * * @since 5.2 */ public void setConnectionConfigResolver(final Resolver connectionConfigResolver) { connPool.setConnectionConfigResolver(connectionConfigResolver); } }




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