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// Copyright 2014 Google Inc. All rights reserved.
//
// 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.devtools.build.lib.actions;
import com.google.protobuf.ByteString;
import java.io.File;
import java.io.IOException;
import javax.annotation.Nullable;
import javax.annotation.concurrent.ThreadSafe;
/**
* The interface for Action inputs metadata (Digest and size).
*
* NOTE: Implementations must be thread safe.
*/
@ThreadSafe
public interface ActionInputFileCache {
/**
* Returns digest for the given artifact. This digest is current as of some time t >= the start of
* the present build. If the artifact is an output of an action that already executed at time p,
* then t >= p. Aside from these properties, t can be any value and may vary arbitrarily across
* calls.
*
* @param input the input to retrieve the digest for
* @return the artifact's digest or null if digest cannot be obtained (due to artifact
* non-existence, lookup errors, or any other reason)
*
* @throws DigestOfDirectoryException in case {@code input} is a directory.
* @throws IOException If the file cannot be digested.
*
*/
@Nullable
ByteString getDigest(ActionInput input) throws IOException;
/**
* Retrieve the size of the file at the given path. Will usually return 0 on failure instead of
* throwing an IOException. Returns 0 for files inaccessible to user, but available to the
* execution environment.
*
* @param input the input.
* @return the file size in bytes.
* @throws IOException on failure.
*/
long getSizeInBytes(ActionInput input) throws IOException;
/**
* Checks if the file is available locally, based on the assumption that previous operations on
* the ActionInputFileCache would have created a cache entry for it.
*
* @param digest the digest to lookup.
* @return true if the specified digest is backed by a locally-readable file, false otherwise
*/
boolean contentsAvailableLocally(ByteString digest);
/**
* Concrete subclasses must implement this to provide a mapping from digest to file path,
* based on files previously seen as inputs.
*
* @param digest the digest.
* @return a File path.
*/
@Nullable
File getFileFromDigest(ByteString digest) throws IOException;
}
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