/*
* Copyright 2010 the original author or authors.
*
* 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 org.gradle.cache;
import org.gradle.api.GradleException;
import java.io.*;
public class SimpleStateCache<T> implements PersistentStateCache<T> {
private final Serializer<T> serializer;
private final File cacheFile;
private PersistentCache cache;
public SimpleStateCache(PersistentCache cache, Serializer<T> serializer) {
this.cache = cache;
this.serializer = serializer;
cacheFile = new File(cache.getBaseDir(), "state.bin");
}
public T get() {
if (!cacheFile.isFile()) {
return null;
}
try {
InputStream inStr = new BufferedInputStream(new FileInputStream(cacheFile));
try {
return serializer.read(inStr);
} finally {
inStr.close();
}
} catch (Exception e) {
throw new GradleException(String.format("Could not read cache value from '%s'.", cacheFile), e);
}
}
public void set(T newValue) {
try {
OutputStream outStr = new BufferedOutputStream(new FileOutputStream(cacheFile));
try {
serializer.write(outStr, newValue);
} finally {
outStr.close();
}
} catch (Exception e) {
throw new GradleException(String.format("Could not write cache value to '%s'.", cacheFile), e);
}
cache.markValid();
}
}