Java tutorial
package pl.allegro.tech.hermes.consumers.consumer.sender.http; /* * ==================================================================== * 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/>. * */ import org.apache.http.annotation.NotThreadSafe; import org.apache.http.entity.AbstractHttpEntity; import org.apache.http.entity.ContentType; import org.apache.http.util.Args; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.ByteBuffer; import java.nio.channels.Channels; import java.nio.channels.WritableByteChannel; /* * CAUTION! * This implementation comes from PR that was merged directly into hc.core5 * which is not backwards compatible with http-components version 4. We need * entire http stack and not just the core so we cannot use core5 yet. This * is the last implementation that works on version 4. If it is good enough * for hc.core5 then it should be ok for out use case. * * PR: https://github.com/apache/httpcore/pull/13 * * */ /** * An entity that delivers the contents of a {@link ByteBuffer}. */ @NotThreadSafe public class ByteBufferEntity extends AbstractHttpEntity implements Cloneable { private final ByteBuffer buffer; private class ByteBufferInputStream extends InputStream { ByteBufferInputStream() { buffer.position(0); } public int read() throws IOException { if (!buffer.hasRemaining()) { return -1; } return buffer.get() & 0xFF; } public int read(byte[] bytes, int off, int len) throws IOException { if (!buffer.hasRemaining()) { return -1; } len = Math.min(len, buffer.remaining()); buffer.get(bytes, off, len); return len; } } public ByteBufferEntity(final ByteBuffer buffer, final ContentType contentType) { super(); Args.notNull(buffer, "Source byte buffer"); this.buffer = buffer; if (contentType != null) { setContentType(contentType.toString()); } } public ByteBufferEntity(final ByteBuffer buffer) { this(buffer, null); } @Override public boolean isRepeatable() { return true; } @Override public long getContentLength() { return buffer.limit(); } @Override public InputStream getContent() throws IOException, UnsupportedOperationException { return new ByteBufferInputStream(); } @Override public void writeTo(OutputStream outstream) throws IOException { Args.notNull(outstream, "Output stream"); WritableByteChannel channel = Channels.newChannel(outstream); channel.write(buffer); outstream.flush(); } @Override public boolean isStreaming() { return false; } @Override public Object clone() throws CloneNotSupportedException { return super.clone(); } }