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package org.apache.camel.component.file.strategy; |
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import java.io.File; |
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import java.io.RandomAccessFile; |
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import java.nio.channels.Channel; |
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import java.nio.channels.FileChannel; |
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import java.nio.channels.FileLock; |
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import org.apache.camel.component.file.FileEndpoint; |
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import org.apache.camel.component.file.FileExchange; |
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import org.apache.camel.util.ExchangeHelper; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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public abstract class FileProcessStrategySupport implements FileProcessStrategy { |
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public static final String DEFAULT_LOCK_FILE_POSTFIX = ".cameLock"; |
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private static final transient Log LOG = LogFactory.getLog(FileProcessStrategySupport.class); |
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private boolean lockFile; |
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private FileRenamer lockFileRenamer; |
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protected FileProcessStrategySupport() { |
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this(true); |
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} |
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protected FileProcessStrategySupport(boolean lockFile) { |
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this(lockFile, new DefaultFileRenamer(null, DEFAULT_LOCK_FILE_POSTFIX)); |
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} |
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protected FileProcessStrategySupport(boolean lockFile, FileRenamer lockFileRenamer) { |
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this.lockFile = lockFile; |
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this.lockFileRenamer = lockFileRenamer; |
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} |
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public boolean begin(FileEndpoint endpoint, FileExchange exchange, File file) throws Exception { |
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if (isLockFile()) { |
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File newFile = lockFileRenamer.renameFile(file); |
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String lockFileName = newFile.getAbsolutePath(); |
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if (LOG.isDebugEnabled()) { |
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LOG.debug("Locking the file: " + file + " using the lock file name: " + lockFileName); |
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} |
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FileChannel channel = new RandomAccessFile(lockFileName, "rw").getChannel(); |
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FileLock lock = channel.lock(); |
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if (lock != null) { |
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exchange.setProperty("org.apache.camel.fileChannel", channel); |
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exchange.setProperty("org.apache.camel.file.lock", lock); |
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exchange.setProperty("org.apache.camel.file.lock.name", lockFileName); |
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return true; |
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} |
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return false; |
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} |
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return true; |
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} |
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public void commit(FileEndpoint endpoint, FileExchange exchange, File file) throws Exception { |
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if (isLockFile()) { |
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Channel channel = ExchangeHelper.getMandatoryProperty(exchange, "org.apache.camel.fileChannel", Channel.class); |
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String lockfile = ExchangeHelper.getMandatoryProperty(exchange, "org.apache.camel.file.lock.name", String.class); |
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if (LOG.isDebugEnabled()) { |
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LOG.debug("Unlocking file: " + file); |
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} |
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channel.close(); |
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File lock = new File(lockfile); |
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lock.delete(); |
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} |
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} |
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public boolean isLockFile() { |
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return lockFile; |
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} |
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public void setLockFile(boolean lockFile) { |
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this.lockFile = lockFile; |
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} |
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public FileRenamer getLockFileRenamer() { |
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return lockFileRenamer; |
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} |
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public void setLockFileRenamer(FileRenamer lockFileRenamer) { |
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this.lockFileRenamer = lockFileRenamer; |
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} |
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} |