io.grpc.okhttp.OkHttpWritableBufferAllocator Maven / Gradle / Ivy
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/*
* Copyright 2015 The gRPC 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 io.grpc.okhttp;
import io.grpc.internal.WritableBuffer;
import io.grpc.internal.WritableBufferAllocator;
import okio.Buffer;
/**
* The default allocator for {@link OkHttpWritableBuffer}s used by the OkHttp transport. OkHttp
* cannot receive buffers larger than the max DATA frame size - 1 so we must set an upper bound on
* the allocated buffer size here.
*/
class OkHttpWritableBufferAllocator implements WritableBufferAllocator {
// Use 4k as our minimum buffer size.
private static final int MIN_BUFFER = 4096;
// Set the maximum buffer size to 1MB
private static final int MAX_BUFFER = 1024 * 1024;
/**
* Construct a new instance.
*/
OkHttpWritableBufferAllocator() {
}
/**
* For OkHttp we will often return a buffer smaller than the requested capacity as this is the
* mechanism for chunking a large GRPC message over many DATA frames.
*/
@Override
public WritableBuffer allocate(int capacityHint) {
capacityHint = Math.min(MAX_BUFFER, Math.max(MIN_BUFFER, capacityHint));
return new OkHttpWritableBuffer(new Buffer(), capacityHint);
}
}