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// Copyright 2008 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.codereview.rpc;
import com.google.protobuf.RpcCallback;
import com.google.protobuf.RpcController;
import java.util.Random;
/**
* A simple controller which does not support cancellation.
* <p>
* Users should check {@link #failed()} to determine if a call failed.
*/
public class SimpleController implements RpcController {
private static final int SLEEP_MIN = 100; // milliseconds
private static final int SLEEP_MAX = 2 * 60 * 1000; // milliseconds
private static final int MAX_ATTEMPT_PERIOD = 30 * 60 * 1000; // milliseconds
private static final ThreadLocal<Random> SLEEP_RNG =
new ThreadLocal<Random>() {
@Override
protected Random initialValue() {
return new Random();
}
};
private static int waitTime() {
return SLEEP_MIN + SLEEP_RNG.get().nextInt(SLEEP_MAX - SLEEP_MIN);
}
private String errorText;
private long start;
public String errorText() {
return errorText;
}
public boolean failed() {
return errorText != null;
}
public void reset() {
errorText = null;
}
public void setFailed(final String reason) {
errorText = reason;
}
public void startCancel() {
throw new UnsupportedOperationException();
}
public boolean isCanceled() {
return false;
}
public void notifyOnCancel(final RpcCallback<Object> callback) {
throw new UnsupportedOperationException();
}
boolean retry() {
if (System.currentTimeMillis() - start < MAX_ATTEMPT_PERIOD) {
try {
Thread.sleep(waitTime());
} catch (InterruptedException ie) {
// Just let the thread continue anyway.
}
return true;
}
if (start == 0) {
setFailed("retry not supported by the RpcChannel");
return false;
}
final int s = MAX_ATTEMPT_PERIOD / 1000;
setFailed("cannot complete in <" + s + " seconds");
return false;
}
void markFirstRequest() {
start = System.currentTimeMillis();
}
}
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