examples.CheckSessionState.java Source code

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Here is the source code for examples.CheckSessionState.java

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/*
 * Copyright (c) 2016 Couchbase, 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 examples;

import com.couchbase.client.dcp.state.PartitionState;
import com.couchbase.client.dcp.state.SessionState;
import com.couchbase.client.deps.com.fasterxml.jackson.databind.ObjectMapper;
import rx.functions.Action1;

import java.io.File;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;

public class CheckSessionState {
    private static final ObjectMapper JACKSON = new ObjectMapper();

    public static void main(String[] args) {
        if (args.length == 0) {
            System.err.println("At least one path to serialized session required.");
            System.exit(1);
        }
        for (String sessionStatePath : args) {
            try {
                File sessionStateFile = new File(sessionStatePath);
                SessionState sessionState = JACKSON.readValue(sessionStateFile, SessionState.class);
                final AtomicInteger idx = new AtomicInteger(0);
                sessionState.foreachPartition(new Action1<PartitionState>() {
                    @Override
                    public void call(PartitionState state) {
                        int partition = idx.getAndIncrement();
                        if (lessThan(state.getEndSeqno(), state.getStartSeqno())) {
                            System.out.printf("stream request for partition %d will fail because "
                                    + "start sequence number (%d) is larger than " + "end sequence number (%d)\n",
                                    partition, state.getStartSeqno(), state.getEndSeqno());
                        }
                        if (lessThan(state.getStartSeqno(), state.getSnapshotStartSeqno())) {
                            System.out.printf(
                                    "stream request for partition %d will fail because "
                                            + "snapshot start sequence number (%d) must not be larger than "
                                            + "start sequence number (%d)\n",
                                    partition, state.getSnapshotStartSeqno(), state.getStartSeqno());
                        }
                        if (lessThan(state.getSnapshotEndSeqno(), state.getStartSeqno())) {
                            System.out.printf(
                                    "stream request for partition %d will fail because "
                                            + "start sequence number (%d) must not be larger than "
                                            + "snapshot end sequence number (%d)\n",
                                    partition, state.getStartSeqno(), state.getSnapshotEndSeqno());
                        }
                    }
                });
            } catch (IOException e) {
                System.out.println("Failed to decode " + sessionStatePath + ": " + e);
            }
        }
    }

    /**
     * @return true if x < y, where x and y treated as unsigned long int
     */
    private static boolean lessThan(long x, long y) {
        return (x < y) ^ (x < 0) ^ (y < 0);
    }
}