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Support silently capturing output from Python if necessary.
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dqops/src/main/java/com/dqops/utils/python/TailOutputStream.java
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| /* | ||
| * Copyright © 2021 DQOps (support@dqops.com) | ||
| * | ||
| * 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 com.dqops.utils.python; | ||
|
|
||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.io.OutputStream; | ||
| import java.util.concurrent.CompletableFuture; | ||
|
|
||
| /** | ||
| * Output stream is simply captures the most recently received content and constantly rewinds the output stream. | ||
| */ | ||
| public class TailOutputStream extends OutputStream { | ||
| private final OutputStream nestedStream; | ||
|
|
||
| /** | ||
| * Creates an output stream wrapper that will detect any data that was written. | ||
| * @param nestedStream Nested stream. | ||
| */ | ||
| public TailOutputStream(OutputStream nestedStream) { | ||
| this.nestedStream = nestedStream; | ||
| } | ||
|
|
||
| /** | ||
| * Writes {@code b.length} bytes from the specified byte array | ||
| * to this output stream. The general contract for {@code write(b)} | ||
| * is that it should have exactly the same effect as the call | ||
| * {@code write(b, 0, b.length)}. | ||
| * | ||
| * @param b the data. | ||
| * @throws IOException if an I/O error occurs. | ||
| * @see OutputStream#write(byte[], int, int) | ||
| */ | ||
| @Override | ||
| public void write(byte[] b) throws IOException { | ||
| this.nestedStream.write(b); | ||
| } | ||
|
|
||
| /** | ||
| * Writes {@code len} bytes from the specified byte array | ||
| * starting at offset {@code off} to this output stream. | ||
| * The general contract for {@code write(b, off, len)} is that | ||
| * some of the bytes in the array {@code b} are written to the | ||
| * output stream in order; element {@code b[off]} is the first | ||
| * byte written and {@code b[off+len-1]} is the last byte written | ||
| * by this operation. | ||
| * <p> | ||
| * The {@code write} method of {@code OutputStream} calls | ||
| * the write method of one argument on each of the bytes to be | ||
| * written out. Subclasses are encouraged to override this method and | ||
| * provide a more efficient implementation. | ||
| * <p> | ||
| * If {@code b} is {@code null}, a | ||
| * {@code NullPointerException} is thrown. | ||
| * <p> | ||
| * If {@code off} is negative, or {@code len} is negative, or | ||
| * {@code off+len} is greater than the length of the array | ||
| * {@code b}, then an {@code IndexOutOfBoundsException} is thrown. | ||
| * | ||
| * @param b the data. | ||
| * @param off the start offset in the data. | ||
| * @param len the number of bytes to write. | ||
| * @throws IOException if an I/O error occurs. In particular, | ||
| * an {@code IOException} is thrown if the output | ||
| * stream is closed. | ||
| */ | ||
| @Override | ||
| public void write(byte[] b, int off, int len) throws IOException { | ||
| if (this.nestedStream instanceof ByteArrayOutputStream) { | ||
| ByteArrayOutputStream byteArrayOutputStream = (ByteArrayOutputStream)this.nestedStream; | ||
| byteArrayOutputStream.reset(); | ||
| } | ||
| this.nestedStream.write(b, off, len); | ||
| } | ||
|
|
||
| /** | ||
| * Writes the specified byte to this output stream. The general | ||
| * contract for {@code write} is that one byte is written | ||
| * to the output stream. The byte to be written is the eight | ||
| * low-order bits of the argument {@code b}. The 24 | ||
| * high-order bits of {@code b} are ignored. | ||
| * <p> | ||
| * Subclasses of {@code OutputStream} must provide an | ||
| * implementation for this method. | ||
| * | ||
| * @param b the {@code byte}. | ||
| * @throws IOException if an I/O error occurs. In particular, | ||
| * an {@code IOException} may be thrown if the | ||
| * output stream has been closed. | ||
| */ | ||
| @Override | ||
| public void write(int b) throws IOException { | ||
| this.nestedStream.write(b); | ||
| } | ||
|
|
||
| /** | ||
| * Flushes this output stream and forces any buffered output bytes | ||
| * to be written out. The general contract of {@code flush} is | ||
| * that calling it is an indication that, if any bytes previously | ||
| * written have been buffered by the implementation of the output | ||
| * stream, such bytes should immediately be written to their | ||
| * intended destination. | ||
| * <p> | ||
| * If the intended destination of this stream is an abstraction provided by | ||
| * the underlying operating system, for example a file, then flushing the | ||
| * stream guarantees only that bytes previously written to the stream are | ||
| * passed to the operating system for writing; it does not guarantee that | ||
| * they are actually written to a physical device such as a disk drive. | ||
| * <p> | ||
| * The {@code flush} method of {@code OutputStream} does nothing. | ||
| * | ||
| * @throws IOException if an I/O error occurs. | ||
| */ | ||
| @Override | ||
| public void flush() throws IOException { | ||
| nestedStream.flush(); | ||
| } | ||
|
|
||
| /** | ||
| * Closes this output stream and releases any system resources | ||
| * associated with this stream. The general contract of {@code close} | ||
| * is that it closes the output stream. A closed stream cannot perform | ||
| * output operations and cannot be reopened. | ||
| * <p> | ||
| * The {@code close} method of {@code OutputStream} does nothing. | ||
| * | ||
| * @throws IOException if an I/O error occurs. | ||
| */ | ||
| @Override | ||
| public void close() throws IOException { | ||
| nestedStream.close(); | ||
| } | ||
| } |