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[SYMMETRICDS-88] - Enable memory and file buffer for all synchronizat…
…ions. The choice of memory vs. file system is dependent on the threshold setting.
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symmetric/src/main/java/org/jumpmind/symmetric/io/ThresholdFileWriter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| /* | ||
| * SymmetricDS is an open source database synchronization solution. | ||
| * | ||
| * Copyright (C) Chris Henson <chenson42@users.sourceforge.net> | ||
| * | ||
| * This library is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU Lesser General Public | ||
| * License as published by the Free Software Foundation; either | ||
| * version 3 of the License, or (at your option) any later version. | ||
| * | ||
| * This library is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| * Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public | ||
| * License along with this library; if not, see | ||
| * <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.jumpmind.symmetric.io; | ||
|
|
||
| import java.io.BufferedWriter; | ||
| import java.io.File; | ||
| import java.io.FileReader; | ||
| import java.io.FileWriter; | ||
| import java.io.IOException; | ||
| import java.io.Reader; | ||
| import java.io.StringReader; | ||
| import java.io.Writer; | ||
|
|
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| import org.jumpmind.symmetric.util.AppUtils; | ||
|
|
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| /** | ||
| * Write to an internal buffer up until the threshold. When the threshold is | ||
| * reached, flush the buffer to the file and write to the file from that point | ||
| * forward. | ||
| */ | ||
| public class ThresholdFileWriter extends Writer { | ||
|
|
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| File file; | ||
|
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| String tempFileCategory; | ||
|
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| BufferedWriter fileWriter; | ||
|
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| StringBuilder buffer; | ||
|
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| long threshhold; | ||
|
|
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| /** | ||
| * @param threshold The number of bytes at which to start writing to a file | ||
| * @param file The file to write to after the threshold has been reached | ||
| */ | ||
| public ThresholdFileWriter(long threshold, File file) { | ||
| this.file = file; | ||
| this.buffer = new StringBuilder(); | ||
| this.threshhold = threshold; | ||
| } | ||
|
|
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| /** | ||
| * @param threshold The number of bytes at which to start writing to a file | ||
| * @param tempFileCategory uses {@link AppUtils#createTempFile(String)} with this argument as the parameter | ||
| * @see AppUtils#createTempFile(String) | ||
| */ | ||
| public ThresholdFileWriter(long threshold, String tempFileCategory) { | ||
| this.tempFileCategory = tempFileCategory; | ||
| this.buffer = new StringBuilder(); | ||
| this.threshhold = threshold; | ||
| } | ||
|
|
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| @Override | ||
| public void close() throws IOException { | ||
| if (fileWriter != null) { | ||
| fileWriter.close(); | ||
| } | ||
| } | ||
|
|
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| @Override | ||
| public void flush() throws IOException { | ||
| if (fileWriter != null) { | ||
| fileWriter.flush(); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void write(char[] cbuf, int off, int len) throws IOException { | ||
| if (fileWriter != null) { | ||
| } else if (len + buffer.length() > threshhold) { | ||
| if (file == null) { | ||
| file = AppUtils.createTempFile(tempFileCategory == null ? "threshold.file.writer" : tempFileCategory); | ||
| } | ||
| fileWriter = new BufferedWriter(new FileWriter(file)); | ||
| fileWriter.write(buffer.toString()); | ||
| fileWriter.write(cbuf, off, len); | ||
| fileWriter.flush(); | ||
| } else { | ||
| buffer.append(new String(cbuf), off, len); | ||
| } | ||
| } | ||
|
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| public Reader getReader() throws IOException { | ||
| if (fileWriter != null) { | ||
| return new FileReader(file); | ||
| } else { | ||
| return new StringReader(buffer.toString()); | ||
| } | ||
| } | ||
|
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| public void delete() { | ||
| if (file != null && file.exists()) { | ||
| file.delete(); | ||
| } | ||
| } | ||
|
|
||
| } |
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