org.apache.flink.runtime.blob.BlobServerProtocol Maven / Gradle / Ivy
/*
* 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.flink.runtime.blob;
/**
* Defines constants for the protocol between the BLOB {@link BlobServer server} and the {@link
* AbstractBlobCache caches}.
*/
public class BlobServerProtocol {
// --------------------------------------------------------------------------------------------
// Constants used in the protocol of the BLOB store
// --------------------------------------------------------------------------------------------
/** The buffer size in bytes for network transfers. */
static final int BUFFER_SIZE = 65536; // 64 K
/**
* Internal code to identify a PUT operation.
*
* Note: previously, there was also DELETE_OPERATION (code 2).
*/
static final byte PUT_OPERATION = 0;
/**
* Internal code to identify a GET operation.
*
*
Note: previously, there was also DELETE_OPERATION (code 2).
*/
static final byte GET_OPERATION = 1;
/** Internal code to identify a successful operation. */
static final byte RETURN_OKAY = 0;
/** Internal code to identify an erroneous operation. */
static final byte RETURN_ERROR = 1;
/**
* Internal code to identify a job-unrelated BLOBs (only for transient BLOBs!).
*
*
Note: previously, there was also NAME_ADDRESSABLE (code 1).
*/
static final byte JOB_UNRELATED_CONTENT = 0;
/**
* Internal code to identify a job-related (permanent or transient) BLOBs.
*
*
Note: This is equal to the previous JOB_ID_SCOPE (code 2).
*/
static final byte JOB_RELATED_CONTENT = 2;
// --------------------------------------------------------------------------------------------
private BlobServerProtocol() {}
}