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buildSrc/src/main/groovy/org/elasticsearch/gradle/LoggingOutputStream.groovy
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buildSrc/src/main/groovy/org/elasticsearch/gradle/vagrant/TapLoggerOutputStream.groovy
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buildSrc/src/main/groovy/org/elasticsearch/gradle/vagrant/VagrantLoggerOutputStream.groovy
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buildSrc/src/main/java/org/elasticsearch/gradle/LoggingOutputStream.java
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/* | ||
* Licensed to Elasticsearch under one or more contributor | ||
* license agreements. See the NOTICE file distributed with | ||
* this work for additional information regarding copyright | ||
* ownership. Elasticsearch 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.elasticsearch.gradle; | ||
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import java.io.IOException; | ||
import java.io.OutputStream; | ||
import java.util.Arrays; | ||
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/** | ||
* Writes data passed to this stream as log messages. | ||
* | ||
* The stream will be flushed whenever a newline is detected. | ||
* Allows setting an optional prefix before each line of output. | ||
*/ | ||
public abstract class LoggingOutputStream extends OutputStream { | ||
/** The starting length of the buffer */ | ||
private static final int DEFAULT_BUFFER_LENGTH = 4096; | ||
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/** The buffer of bytes sent to the stream */ | ||
private byte[] buffer = new byte[DEFAULT_BUFFER_LENGTH]; | ||
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/** Offset of the start of unwritten data in the buffer */ | ||
private int start = 0; | ||
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/** Offset of the end (semi-open) of unwritten data in the buffer */ | ||
private int end = 0; | ||
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@Override | ||
public void write(final int b) throws IOException { | ||
if (b == 0) return; | ||
if (b == '\n') { | ||
// always flush with newlines instead of adding to the buffer | ||
flush(); | ||
return; | ||
} | ||
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if (end == buffer.length) { | ||
if (start != 0) { | ||
// first try shifting the used buffer back to the beginning to make space | ||
int len = end - start; | ||
System.arraycopy(buffer, start, buffer, 0, len); | ||
start = 0; | ||
end = len; | ||
} else { | ||
// otherwise extend the buffer | ||
buffer = Arrays.copyOf(buffer, buffer.length + DEFAULT_BUFFER_LENGTH); | ||
} | ||
} | ||
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buffer[end++] = (byte) b; | ||
} | ||
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@Override | ||
public void flush() { | ||
if (end == start) return; | ||
logLine(new String(buffer, start, end - start)); | ||
start = end; | ||
} | ||
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protected abstract void logLine(String line); | ||
} |
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