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Commons IO example source code file (LockableFileWriterTest.java)
The Commons IO LockableFileWriterTest.java source code/* * 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. */ package org.apache.commons.io.output; import java.io.File; import java.io.IOException; import java.io.Writer; import org.apache.commons.io.IOUtils; import org.apache.commons.io.testtools.FileBasedTestCase; /** * Tests that files really lock, although no writing is done as * the locking is tested only on construction. * * @version $Revision: 806007 $ $Date: 2009-08-20 00:03:11 +0100 (Thu, 20 Aug 2009) $ */ public class LockableFileWriterTest extends FileBasedTestCase { private File file; private File lockDir; private File lockFile; private File altLockDir; private File altLockFile; public LockableFileWriterTest(String name) { super(name); } @Override public void setUp() { file = new File(getTestDirectory(), "testlockfile"); lockDir = new File(System.getProperty("java.io.tmpdir")); lockFile = new File(lockDir, file.getName() + ".lck"); altLockDir = getTestDirectory(); altLockFile = new File(altLockDir, file.getName() + ".lck"); } @Override public void tearDown() { file.delete(); lockFile.delete(); altLockFile.delete(); } //----------------------------------------------------------------------- public void testFileLocked() throws IOException { LockableFileWriter lfw1 = null; LockableFileWriter lfw2 = null; LockableFileWriter lfw3 = null; try { // open a valid locakable writer lfw1 = new LockableFileWriter(file); assertEquals(true, file.exists()); assertEquals(true, lockFile.exists()); // try to open a second writer try { lfw2 = new LockableFileWriter(file); fail("Somehow able to open a locked file. "); } catch(IOException ioe) { String msg = ioe.getMessage(); assertTrue( "Exception message does not start correctly. ", msg.startsWith("Can't write file, lock ") ); assertEquals(true, file.exists()); assertEquals(true, lockFile.exists()); } // try to open a third writer try { lfw3 = new LockableFileWriter(file); fail("Somehow able to open a locked file. "); } catch(IOException ioe) { String msg = ioe.getMessage(); assertTrue( "Exception message does not start correctly. ", msg.startsWith("Can't write file, lock ") ); assertEquals(true, file.exists()); assertEquals(true, lockFile.exists()); } } finally { IOUtils.closeQuietly(lfw1); IOUtils.closeQuietly(lfw2); IOUtils.closeQuietly(lfw3); } assertEquals(true, file.exists()); assertEquals(false, lockFile.exists()); } //----------------------------------------------------------------------- public void testAlternateLockDir() throws IOException { LockableFileWriter lfw1 = null; LockableFileWriter lfw2 = null; try { // open a valid locakable writer lfw1 = new LockableFileWriter(file, true, altLockDir.getAbsolutePath()); assertEquals(true, file.exists()); assertEquals(true, altLockFile.exists()); // try to open a second writer try { lfw2 = new LockableFileWriter(file, true, altLockDir.getAbsolutePath()); fail("Somehow able to open a locked file. "); } catch(IOException ioe) { String msg = ioe.getMessage(); assertTrue( "Exception message does not start correctly. ", msg.startsWith("Can't write file, lock ") ); assertEquals(true, file.exists()); assertEquals(true, altLockFile.exists()); } } finally { IOUtils.closeQuietly(lfw1); IOUtils.closeQuietly(lfw2); } assertEquals(true, file.exists()); assertEquals(false, altLockFile.exists()); } //----------------------------------------------------------------------- public void testFileNotLocked() throws IOException { // open a valid locakable writer LockableFileWriter lfw1 = null; try { lfw1 = new LockableFileWriter(file); assertEquals(true, file.exists()); assertEquals(true, lockFile.exists()); } finally { IOUtils.closeQuietly(lfw1); } assertEquals(true, file.exists()); assertEquals(false, lockFile.exists()); // open a second valid writer on the same file LockableFileWriter lfw2 = null; try { lfw2 = new LockableFileWriter(file); assertEquals(true, file.exists()); assertEquals(true, lockFile.exists()); } finally { IOUtils.closeQuietly(lfw2); } assertEquals(true, file.exists()); assertEquals(false, lockFile.exists()); } //----------------------------------------------------------------------- public void testConstructor_File_encoding_badEncoding() { Writer writer = null; try { writer = new LockableFileWriter(file, "BAD-ENCODE"); fail(); } catch (IOException ex) { // expected assertEquals(false, file.exists()); assertEquals(false, lockFile.exists()); } finally { IOUtils.closeQuietly(writer); } assertEquals(false, file.exists()); assertEquals(false, lockFile.exists()); } //----------------------------------------------------------------------- public void testConstructor_File_directory() { Writer writer = null; try { writer = new LockableFileWriter(getTestDirectory()); fail(); } catch (IOException ex) { // expected assertEquals(false, file.exists()); assertEquals(false, lockFile.exists()); } finally { IOUtils.closeQuietly(writer); } assertEquals(false, file.exists()); assertEquals(false, lockFile.exists()); } //----------------------------------------------------------------------- public void testConstructor_File_nullFile() throws IOException { Writer writer = null; try { writer = new LockableFileWriter((File) null); fail(); } catch (NullPointerException ex) { // expected assertEquals(false, file.exists()); assertEquals(false, lockFile.exists()); } finally { IOUtils.closeQuietly(writer); } assertEquals(false, file.exists()); assertEquals(false, lockFile.exists()); } //----------------------------------------------------------------------- public void testConstructor_fileName_nullFile() throws IOException { Writer writer = null; try { writer = new LockableFileWriter((String) null); fail(); } catch (NullPointerException ex) { // expected assertEquals(false, file.exists()); assertEquals(false, lockFile.exists()); } finally { IOUtils.closeQuietly(writer); } assertEquals(false, file.exists()); assertEquals(false, lockFile.exists()); } } Other Commons IO examples (source code examples)Here is a short list of links related to this Commons IO LockableFileWriterTest.java source code file: |
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