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TailLogEntries.java
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TailLogEntries.java
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/*
* Copyright 2021 Google LLC
*
* 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.example.logging;
// [START logging_tail_log_entries]
import com.google.cloud.logging.LogEntry;
import com.google.cloud.logging.LogEntryServerStream;
import com.google.cloud.logging.Logging;
import com.google.cloud.logging.Logging.TailOption;
import com.google.cloud.logging.LoggingOptions;
public class TailLogEntries {
public static void main(String[] args) throws Exception {
// TODO(developer): Optionally provide the logname as an argument.
String logName = args.length > 0 ? args[0] : "";
LoggingOptions options = LoggingOptions.getDefaultInstance();
try (Logging logging = options.getService()) {
// Optionally compose a filter to tail log entries only from specific log
LogEntryServerStream stream;
if (logName != "") {
stream =
logging.tailLogEntries(
TailOption.filter(
"logName=projects/" + options.getProjectId() + "/logs/" + logName));
} else {
stream = logging.tailLogEntries();
}
System.out.println("start streaming..");
for (LogEntry log : stream) {
System.out.println(log);
// cancel infinite streaming after receiving first entry
stream.cancel();
}
}
}
}
// [END logging_tail_log_entries]