com.google.gwt.dev.util.DiskCacheToken Maven / Gradle / Ivy
/*
* Copyright 2011 Google Inc.
*
* 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 com.google.gwt.dev.util;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
/**
* Wrapper around a {@link DiskCache} token that allows easy serialization.
*/
public class DiskCacheToken implements Serializable {
private transient DiskCache diskCache;
private transient long token;
/**
* Create a wrapper for a token associated with {@link DiskCache#INSTANCE}.
*/
public DiskCacheToken(long token) {
this(DiskCache.INSTANCE, token);
}
/**
* Create a wrapper for a token associated with the given diskCache.
*/
DiskCacheToken(DiskCache diskCache, long token) {
assert token >= 0;
this.diskCache = diskCache;
this.token = token;
}
/**
* Retrieve the underlying bytes.
*
* @return the bytes that were written
*/
public synchronized byte[] readByteArray() {
return diskCache.readByteArray(token);
}
/**
* Deserialize the underlying bytes as an object.
*
* @param the type of the object to deserialize
* @param type the type of the object to deserialize
* @return the deserialized object
*/
public T readObject(Class type) {
return diskCache.readObject(token, type);
}
private void readObject(ObjectInputStream inputStream) throws IOException {
diskCache = DiskCache.INSTANCE;
token = diskCache.transferFromStream(inputStream);
}
private void writeObject(ObjectOutputStream outputStream) throws IOException {
diskCache.transferToStream(token, outputStream);
}
}