garydgregory commented on code in PR #681: URL: https://github.com/apache/httpcomponents-client/pull/681#discussion_r2227646991
########## httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/CompressingAsyncEntityProducer.java: ########## @@ -0,0 +1,181 @@ +/* + * ==================================================================== + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * 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. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * <http://www.apache.org/>. + * + */ +package org.apache.hc.client5.http.async.methods; + +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.nio.ByteBuffer; +import java.util.Collections; +import java.util.HashSet; +import java.util.List; +import java.util.Locale; +import java.util.Set; +import java.util.concurrent.atomic.AtomicInteger; + +import org.apache.hc.client5.http.entity.compress.ContentCodecRegistry; +import org.apache.hc.client5.http.entity.compress.ContentCoding; +import org.apache.hc.core5.http.ContentType; +import org.apache.hc.core5.http.Header; +import org.apache.hc.core5.http.HttpEntity; +import org.apache.hc.core5.http.io.entity.ByteArrayEntity; +import org.apache.hc.core5.http.nio.AsyncEntityProducer; +import org.apache.hc.core5.http.nio.DataStreamChannel; +import org.apache.hc.core5.util.Args; + +/** + * Generic {@link AsyncEntityProducer} that compresses the output produced by a + * delegate using any codec available via {@link ContentCodecRegistry#encoder}. + * + * <p>The delegate’s entire payload is buffered once; therefore use this class + * only for modest payload sizes.</p> + * + * @since 5.6 + */ +public final class CompressingAsyncEntityProducer implements AsyncEntityProducer { + + private final byte[] compressed; + private final String codingToken; + private final ContentType contentType; + private final AtomicInteger cursor = new AtomicInteger(); + + public CompressingAsyncEntityProducer( + final AsyncEntityProducer delegate, + final String coding) throws IOException { + + Args.notNull(delegate, "delegate"); + this.codingToken = Args.notBlank(coding, "coding").toLowerCase(Locale.ROOT); + this.contentType = ContentType.parse(delegate.getContentType()); + + final ByteArrayOutputStream rawBuf = new ByteArrayOutputStream(); + delegate.produce(new BufferingChannel(rawBuf)); + + final HttpEntity rawEntity = new ByteArrayEntity(rawBuf.toByteArray(), contentType); + final HttpEntity encodedEnt = encode(rawEntity, codingToken); + + final ByteArrayOutputStream encBuf = new ByteArrayOutputStream(); + encodedEnt.writeTo(encBuf); + this.compressed = encBuf.toByteArray(); + } + + @Override + public boolean isRepeatable() { + return false; + } + + @Override + public long getContentLength() { + return compressed.length; + } + + @Override + public String getContentType() { + return contentType.toString(); + } + + @Override + public String getContentEncoding() { + return codingToken; + } + + @Override + public boolean isChunked() { + return false; + } + + @Override + public int available() { + return compressed.length - cursor.get(); + } + + @Override + public Set<String> getTrailerNames() { + return new HashSet<>(); + } + + @Override + public void failed(final Exception ex) { + } + + @Override + public void releaseResources() { + } + + @Override + public void produce(final DataStreamChannel ch) throws IOException { + final int pos = cursor.get(); + if (pos >= compressed.length) { + ch.endStream(Collections.<Header>emptyList()); + return; + } + final int chunk = Math.min(8 * 1024, compressed.length - pos); + ch.write(ByteBuffer.wrap(compressed, pos, chunk)); + cursor.addAndGet(chunk); + } + + private static HttpEntity encode(final HttpEntity src, final String token) throws IOException { + final ContentCoding coding = ContentCoding.fromToken(token); + if (coding == null) { + throw new IOException("Unknown coding: " + token); + } + final java.util.function.UnaryOperator<HttpEntity> op = ContentCodecRegistry.encoder(coding); Review Comment: This shouldn't need to be a fully qualified name. -- This is an automated message from the Apache Git Service. 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