/**
* @param controllerId The controller acquiring the lock
* @return true if the worker was successfully locked, false otherwise
*/
public boolean acquireLock(UUID controllerId) {
logger.info("Acquiring lock of worker <" + metadata.getWorkerId() + ">");
String lockUri = "http://" + metadata.getHostAndPort() + "/control/acquireLock/" + controllerId;
HttpPost httpPost = new HttpPost(lockUri);
boolean locked = tellWorker(httpPost, Response.Status.NO_CONTENT);
if (locked) {
logger.info("Successfully acquired lock of worker <" + metadata.getWorkerId() + ">");
} else {
logger.warn("Acquiring lock of worker <" + metadata.getWorkerId() + "> failed");
}
return locked;
}
/**
* Send an HTTP message to a worker, producing helpful logging if there was a problem
*
* @param uriRequest The request to make
* @param expectedStatus The expected return status
* @return true if the method was successfully delivered & the worker gave the expected response
*/
private boolean tellWorker(HttpUriRequest uriRequest, Response.Status expectedStatus) {
try {
HttpResponse response = httpClient.execute(uriRequest);
if (response.getStatusLine().getStatusCode() != expectedStatus.getStatusCode()) {
StatusLine statusLine = response.getStatusLine();
EntityUtils.consume(response.getEntity());
logger.warn(
"Problem telling worker <"
+ metadata.getWorkerId()
+ "> "
+ "("
+ uriRequest.getURI()
+ "), "
+ "reason ["
+ statusLine.getStatusCode()
+ ": "
+ statusLine.getReasonPhrase()
+ "]");
return false;
}
return true;
} catch (IOException e) {
logger.warn("Unable to communicated with worker " + metadata.toString());
return false;
}
}
/**
* Send an HTTP message to a worker and get the result
*
* <p>Note: expects the worker to respond with OK (200) status code.
*
* @param uriRequest The request to make
* @return An InputStream of the response content
*/
private InputStream askWorker(HttpUriRequest uriRequest) {
try {
HttpResponse response = httpClient.execute(uriRequest);
if (response.getStatusLine().getStatusCode() != Response.Status.OK.getStatusCode()) {
StatusLine statusLine = response.getStatusLine();
EntityUtils.consume(response.getEntity());
logger.warn(
"Problem asking worker <"
+ metadata.getWorkerId()
+ "> "
+ "("
+ uriRequest.getURI()
+ "), "
+ "reason ["
+ statusLine.getStatusCode()
+ ": "
+ statusLine.getReasonPhrase()
+ "]");
}
return response.getEntity().getContent();
} catch (IOException e) {
logger.warn("Unable to communicated with worker " + metadata.toString());
throw Throwables.propagate(e);
}
}
/**
* Submit a job to this worker.
*
* @param jobId The job that this partition is part of
* @param partition The partition fot the worker to do
* @return true if the partition was successfully submitted
*/
public boolean submitPartition(UUID jobId, Partition partition) {
String submitUri = "http://" + metadata.getHostAndPort() + "/job/" + jobId + "/partition";
HttpPut httpPut = new HttpPut(submitUri);
StringEntity stringEntity = null;
try {
stringEntity = new StringEntity(objectWriter.writeValueAsString(partition));
stringEntity.setContentType(MediaType.APPLICATION_JSON);
} catch (IOException e) {
logger.warn(
"Unable to JSONify partition <"
+ partition.getPartitionId()
+ "> for jobId <"
+ jobId
+ ">");
}
httpPut.setEntity(stringEntity);
logger.info(
"Sending partition <"
+ partition.getPartitionId()
+ "> of jobId <"
+ jobId
+ "> to <"
+ metadata.getWorkerId()
+ ">");
return tellWorker(httpPut, Response.Status.ACCEPTED);
}