/*
* 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.jclouds.glacier.blobstore.strategy.internal;
import static com.google.common.base.Preconditions.checkNotNull;
import java.util.concurrent.TimeUnit;
import org.jclouds.glacier.GlacierClient;
import org.jclouds.glacier.blobstore.strategy.PollingStrategy;
import org.jclouds.glacier.domain.JobMetadata;
import org.jclouds.glacier.domain.JobStatus;
import com.google.inject.Inject;
import com.google.inject.Singleton;
/**
* This implementation waits a fixed amount of time before start polling.
*/
@Singleton
public class BasePollingStrategy implements PollingStrategy {
public static final long DEFAULT_INITIAL_WAIT = TimeUnit.HOURS.toMillis(3);
public static final long DEFAULT_TIME_BETWEEN_POLLS = TimeUnit.MINUTES.toMillis(15);
private final GlacierClient client;
private final long initialWait;
private final long timeBetweenPolls;
public BasePollingStrategy(long initialWait, long timeBetweenPolls, GlacierClient client) {
this.initialWait = initialWait;
this.timeBetweenPolls = timeBetweenPolls;
this.client = checkNotNull(client, "client");
}
@Inject
public BasePollingStrategy(GlacierClient client) {
this(DEFAULT_INITIAL_WAIT, DEFAULT_TIME_BETWEEN_POLLS, client);
}
private boolean inProgress(String job, String vault) {
JobMetadata jobMetadata = client.describeJob(vault, job);
return (jobMetadata != null) && (jobMetadata.getStatusCode() == JobStatus.IN_PROGRESS);
}
private void waitForJob(String job, String vault) throws InterruptedException {
Thread.sleep(initialWait);
while (inProgress(job, vault)) {
Thread.sleep(timeBetweenPolls);
}
}
private boolean succeeded(String job, String vault) {
JobMetadata jobMetadata = client.describeJob(vault, job);
return (jobMetadata != null) && (jobMetadata.getStatusCode() == JobStatus.SUCCEEDED);
}
@Override
public boolean waitForSuccess(String vault, String job) throws InterruptedException {
// Avoid waiting if the job doesn't exist
if (client.describeJob(vault, job) == null) {
return false;
}
waitForJob(job, vault);
return succeeded(job, vault);
}
}