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// Copyright 2017 The Bazel Authors. 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.remote.blobstore;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* An interface for storing BLOBs each one indexed by a string (hash in hexadecimal).
*
* <p>Implementations must be thread-safe.
*/
public interface SimpleBlobStore {
/**
* Returns {@code key} if the provided {@code key} is stored in the CAS.
*/
boolean containsKey(String key) throws IOException, InterruptedException;
/**
* Fetches the BLOB associated with the {@code key} from the CAS and writes it to {@code out}.
*
* <p>The caller is responsible to close {@code out}.
*
* @return {@code true} if the {@code key} was found. {@code false} otherwise.
*/
boolean get(String key, OutputStream out) throws IOException, InterruptedException;
/**
* Fetches the BLOB associated with the {@code key} from the Action Cache and writes it to {@code
* out}.
*
* <p>The caller is responsible to close {@code out}.
*
* @return {@code true} if the {@code key} was found. {@code false} otherwise.
*/
boolean getActionResult(String actionKey, OutputStream out)
throws IOException, InterruptedException;
/**
* Uploads a BLOB (as {@code in}) with length {@code length} indexed by {@code key} to the CAS.
*
* <p>The caller is responsible to close {@code in}.
*/
void put(String key, long length, InputStream in) throws IOException, InterruptedException;
/** Uploads a bytearray BLOB (as {@code in}) indexed by {@code key} to the Action Cache. */
void putActionResult(String actionKey, byte[] in) throws IOException, InterruptedException;
/** Close resources associated with the blob store. */
void close();
}
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